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008 | Specification (Technical Standard) | Contracts
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Guide For The Preparation Of Statements Of Technical Requirements For The Development Of Systems And Equipment
Incorporating NES 8
Issue 2 Publication Date June 1986
REVISION NOTE This standard is raised to Issue 1 to update its content. HISTORICAL RECORD This standard supersedes the following: Naval Engineering Standard (NES) 8 Issue 2 dated June 1986.
Issue 2 (Reformatted)
This NES Supersedes NES 8 ISSUE 1
AMDT 1 2 3 4 5 6 7 8 9 10 INSERTED BY DATE
.NAVAL ENGINEERING STANDARD 8
ISSUE 2 (REFORMATTED) GUIDE TO THE PREPARATION OF STATEMENTS OF TECHNICAL REQUIREMENTS FOR THE DEVELOPMENT OF SYSTEMS AND EQUIPMENT
The issue and use of this Standard is authorized for use in MOD contracts by MOD(PE) Sea Systems and the Naval Support Command
ECROWN COPYRIGHT Published by: Director of Naval Architecture Procurement Executive. Ministry of Defence Foxhill.
or Procurement Specifications for manufacture (that embody a Configuration Definition) contractually enforced by a Production Contract.
This NES is generally compatible with the requirements of Annex B.the preparation of: (a) Procurement Specifications for development (that embody an STR) contractually enforced by a Development Contract.the procedures to be followed for the development of platform systems and equipment: b. 3. This NES does not give guidance on: a.NES 8 Issue 2 (Reformatted)
4. It sets a preferred format. Chapter 4 of the ‘Compendium of Guidelines for Project Management’ published by MOD(PE)/DPPI(PM). typographical and publishing style. It contains an Annex—‘Guide to the Content of an STR for a system or equipment’.
2. This NES is a guide to marshalling the technical requirements that need to be included in an STR.
NES 8 Issue 2 (Reformatted)
1. This Naval Engineering Standard (NES) is sponsored by the Procurement Executive, Ministry of Defence, Sea Systems. The policies and procedures for the design, or control of the design, for all Sea Systems Controllerate (SSC) sponsored vessels, their machinery, systems and equipment require the Design Sponsor to specify the technical requirements of the task to be undertaken in development in a Statement of Technical Requirements (STR). This STR forms the kernel to the Procurement Specification that states all the requirements to be imposed on a contractor. The Procurement Specification is the basis of a contract that the Director of Contracts negotiates with the Contractor. This NES is to be used as required by SSC Design Sponsors, their agents and contractors, as a guide to those required to prepare an STR to specify a package of work to be undertaken in the development of a design of a vessel, its machinery, systems, equipment and material. It interprets the substance, and supplants the use of DEF STAN 05−28—‘NATO Guide to the Preparation of Specifications for the Procurement of Defence Materiel’. If it is found to be unsuitable for any particular requirement the MOD(PE) is to be informed in writing of the circumstances. Any user of this NES either within MOD or in industry may propose an amendment to it. Proposals for amendments that are not directly applicable to a particular contract are to be made to the MOD and those directly applicable to a particular contract are to be dealt with using existing procedures or as specified in the contract. No alteration is to be made to this NES except by the issue of an authorized amendment. Unless otherwise stated, reference in this NES to approval, approved, authorized or similar terms, means by the Ministry of Defence in writing. Any significant amendments that may be made to this NES at a later date will be indicated by a vertical side line. Deletions will be indicated by 000 appearing at the end of the line interval. Extracts from British Standards within this NES have been included with the permission of the British Standards Institution.
11. This Naval Engineering Standard (NES) has been prepared for the use of the Crown and of its contractors in the execution of contracts for the Crown. The Crown hereby excludes all liability (other than liability for death or personal injury) whatsoever and howsoever arising (including but without limitation, negligence on the part of the Crown, its servants or agents) for any loss or damage however caused where the NES is used for any other purpose. This document is Crown Copyright and the information herein may be subject to Crown or third party rights. It is not to be released, reproduced or published without written permission of the MOD.
The Crown reserves the right to amend or modify the contents of this NES without consulting or informing any holder.
14. This NES is the property of the Crown and unless otherwise authorized in writing by the MOD must be returned on completion of the contract, or submission of the tender, in connection with which it is issued. When this NES is used in connection with a MOD tender or contract, the user is to ensure that he is in possession of the appropriate version of each document, including related documents, relevant to each particular tender or contract. Enquiries in this connection may be made of the local MOD(PE) Quality Assurance Representative or the Authority named in the tender or contract. When NES are incorporated into MOD contracts, users are responsible for their correct application and for complying with contracts and any other statutory requirements. Compliance with an NES does not of itself confer immunity from legal obligations.
17. In the tender and procurement processes the related documents listed in each section and Annex A can be obtained as follows: (a) British Standards British Standards Institution, 389 Chiswick High Road, London W4 4AL Directorate of Standardization and Safety Policy, Stan 1, Kentigern House, 65 Brown Street, Glasgow G2 8EX CSE3a, CSE Llangennech, Llannelli, Dyfed SA14 8YP Tender or Contract Sponsor to advise.
Note: Tender or Contract Sponsor can advise in cases of difficulty. 18. All applications to Ministry Establishments for related documents are to quote the relevant MOD Invitation to Tender or Contract Number and date, together with the sponsoring Directorate and the Tender or Contract Sponsor. Prime Contractors are responsible for supplying their subcontractors with relevant documentation, including specifications, standards and drawings.
20. This NES may call for the use of processes, substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and in no way absolves either the supplier or the user from statutory obligations relating to health and safety at any stage of manufacture or use. Where attention is drawn to hazards, those quoted may not necessarily be exhaustive.
. . . . . . . . . . . . . . . . . . . . . . . . . What it is to cover . . . . . . . .3 2. . . . . . . .1 3. . . . Purpose of this NES . . . . . . . . . . . . .1 1.2 1. . . CONTENTS . . . . . . . . . . . . . Health & Safety at Work . . . . . . Mandatory Features . . . . . . . . . . . . . . . . . . . . . . Related Documents . . . . . . . . . . FOREWORD . . . . . . . . . .1 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 CHARACTERISTICS OF A STATEMENT OF TECHNICAL REQUIREMENTS . . . . . .5 1. . . . . . . . . . . .6 2. . . . . . . SCOPE OF A STATEMENT OF TECHNICAL REQUIREMENTS . . . . . . . . . . . . . . . . .4 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 2. . .1 1. . . . . . . . . . . . . . .2 1. . . . . . . . .1 2. . . . . . . . . .1 3. . . . . . What it is . . . . . . .1 2. . . . . . . . . . . . . . . . . . .1 3. . . . .4 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cover . . . . . . . . . . . . . . . . . . . . . . . . . 1. . . . . . . .3 2. . . . . . . . . . . . . . . . . . . . . . . . .2 1. . . .1 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . .3 2. General . . .1 1.8 1. . . . . . . . . . . . Structure . . . . . . . . . . . . . . . . . . . . . . . .1 3. . . . . . . . . . . . .5 2. . . . . . . . . . . . . . . . . Clarity of Specification . . . . . . . . . . Alternative Style . . . . .9 SECTION 3. . . . . . . . . . . . . . . . . . Colour . . . . . . .3 2. . . . Responsibility and Accountability . . . . . . . . Usage of Reports . . . . . . . . . . . . . . .2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Basic Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 1. . . . . . . . . .
i iii v v v v vi vi vi vi vii 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 3. . . . . . . . . . Accountability . ARRANGEMENT AND CONTENT . Form . .2 2. . . . . . . . . Depth . . . . . . . . . . . . . . . . . . . . . SECTION 1. . . . .2 2. . . . . . . . . . . . . . . .2 3. . . . . .10 SECTION 2.NES 8 Issue 2 (Reformatted)
Page No TITLE PAGE . . . . . . . . .1 1. . . . . . . . . . . . . . . . . . . . . . . .7 2. . . . . . Health and Safety . Sponsorship . . . . . . . . . . . . . . . . . . . . . . . . .2 1. . . . . . . . . . .6 1. . . . . . . . . . . . . . . . . . . .1 1. . . . . . . . . . . . . . . . . . . . . 3. . . . . . . . .2 2. . . . . . . . . . . . . Conditions of Release . . . . . . . . . . . . . . . . . . Authorization . . . . . . Usage of Standards . . . . . . . . . . . . . . . . 2. . . SCOPE . . . . . . . . . . .1 2. . . . . . . . . . . .7 1. . . . . . . . . .1 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 3. . To whom it is addressed . . . . . . . . . . . .2 2. . . . . . . . . . . . . . . . . . . . . .3 1. . .9 1. . . . . . . . . . . When an STR is required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interactions between Development (of a Design) and Production . . . . . . . . . . . . . . . . . . . . . Warning . . . . . What it can cover . . . . . . . . . . . . . . .3 3. . . MOD Tender or Contract Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .24 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . Trade Names . .11 4. .4 4. . . . . . . . . . .2 4. . .1
. . .4 4. . . . . . . . . C. . . Page numbering . . . . . . . . . . . . .1 B. . . TYPOGRAPHICAL AND PRINTING STYLE . . . . . . . . . .6 4. . . . . . . . . . . . . . . . . .9 4. . . . . . Paper Quality . . . . . .6 SECTION 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 4. . Paragraph and Sub-paragraph numbering Additions and deletions . . . . . . . . . .4 4. . . . . . . . Figures . . . . . .22 4. . .1 4. . B. . . Use of Solidus . . . . . . . . . .3 4. . . .2 4. . . . . Section. . . . . . . Units . . . .1 4. . . . . . . . .1 4. . . . . . . . . . . . . . . . . .10 4. . . . . . . . . . . . . .1 4. . . . . . . . . . .8 4. . . . . . . . . . . . . .4 4. . . . . . . . . . . . . . . . . . . . . . . .
Conditions of Issue . . . . . . . Drawings . . . . . . . . . . . . . . RELATED DOCUMENTS . . . .4 4. . . . . . . . . . . . . .2 3. .5 3. . .23 4. Hyphens . . . .1 4. . . . EDITORIAL. . . . . . . Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 4. . . . .15 4. . . . . . . . . . .13 4.1 4. . . . . . . . . . . DEFINITIONS AND ABBREVIATIONS . . . . . . . Use of Capital Letters . .12 4. . . . . . . Terms and Abbreviations . Symbols . Punching . . . . . . . .3 4. . . . . . . Classification Markings . Tables and Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 4. . . . Parts . . . . . . . . . . . .5 A. . . . . . . . . . . . . . . . Guidance . . . .25 ANNEX ANNEX ANNEX A. . . . . . . . . . . . . . . . . .2 4. . . . . . . . . . . . Binding . . . . . . . . . . . . . Presentation of Numbers . . . . . . . . . . . . . . . . . . . . . . .19 4.14 4. . . . .2 4. . . . . . .18 4. . . . . . . . . Drawings and Figures . Language . Spelling . . . . Typographic Style . . . . . . . . . . . . . .NES 8 Issue 2 (Reformatted)
3. . . . . . . . . . . . . .1 4. . . . . . . . . . .3 4. . . . . . . . . . . . . . . . . . . . 4. . . . . . . . . . . . . . . .4 4. . . . . . . . . . . . . . . . . .3 4. . . . .16 4. . . . . . . . . . . Component Reference . . . . .1 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 4. . . . . . . . . . . . . . .2 4. . . . . . . . . .4 4. . . . . . . . . . .2 4. . . . . .1
GUIDE TO THE ARRANGEMENT AND CONTENT OF A STATEMENT OF TECHNICAL REQUIREMENTS FOR THE DEVELOPMENT OF A SYSTEM OR EQUIPMENT . . .17 4. . . . . . . . . . . . . . .4 4. . . . .5 4. C. . . .1 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 4. . .
a. It is a form of specification in that it is required to convey the intent of one person to another in such a way that there is never any doubt as to the meaning of each and every individual requirement. This defines unambiguously the system or equipment to be manufactured in sufficient detail to ensure that the design intent is met and is preserved in all future production. and however accustomed to SSC practices the contractor may be.
1.NES 8 Issue 2 (Reformatted)
1. and the inter-dependencies on. the job description specified in an STR is to leave nothing unspecified.
b. etc and a separate STR may need to be prepared for each step or materiel division.
b. collectively termed the ‘Configuration Definition’. (especially in cases where a close relationship exists with the contractor or designer either directly or by way of the Overseer or Quality Assurance Representative).5
What it is to cover
a. For the purpose of this NES the development of the design of a total vessel and its machinery is regarded as the deliberate integration of a number of separate systems and equipment thus the STR for the design of a vessel identifies a unique collection of inter-related STRs.
Whether simple or familiar. Development of a large project may need to be divided into sequential steps such as Feasibility Study.
An STR is required only when a development task has to be specified. systems or equipment (materiel) which has to be contracted to someone else. it may be necessary during the development of the design. including a production test specification. its machinery.
. other associated tasks.
1. to amend the STR either
1. but it is a requirement that it should be understood by those who practise the design and skills associated with the development of the job specified.1
CHARACTERISTICS OF A STATEMENT OF TECHNICAL REQUIREMENTS What it is
a. Although an STR should specify all the requirements.4
When an STR is required
a. For each separate package of development work the STR is to clearly define the limits of the task and the inter-relationships with. and that both functional and mechanical interchangeability are assured.
c. Equipment. Project Definition etc or materiel divisions such as Systems. complex or unique.
An STR is the description of a job or package of work connected with the development of a design of a vessel.
An STR can describe any development task associated with total vessel design but the extent of a task covered by a single STR should be limited to that which can be readily managed. especially the Contractor.
An STR need not be universally understood. The final outcome of development is the availability of the minimum package of manufacturing drawings and documentation. Thus an STR is always required when it is not possible to state a ‘Configuration Definition’.
If a style already exists which is acceptable to a contractor for specifying a task in the development of a design that embodies the essential content as defined herein. including Naval Engineering Standards.
The contents of STRs are to be quantified in understandable and realistic terms needing no further interpretation. and is fit for purpose.a. in specifying equipment to withstand shock. with experience or education. presentation of the information in format. and to set down a preferred style including a few mandatory requirements as defined in Clause 1. the actual figures to which the equipment will be shock tested are to be specified together with the preferred method of mounting. produce materiel which is adequate without being elaborate.8
Whatever style is used for the document which specifies the task to be undertaken in a development of a design it is to be called a Statement of Technical Requirements and is to include a number of mandatory features including:
a front cover with unique reference number.
1. which is cost-effective. Reference to Standards. Only the Design Sponsor may authorize such amendments. Expressions such as ‘hot gases’. deduce or extrapolate information. a list of all mandatory documents and drawings. For example.6
Clarity of Specification a. not in a blanket form open to doubt and misinterpretation.2
a. or to permit the adoption of a more cost−effective solution or both.
Purpose of this NES
The complexity of vessels and the intricate interrelationships between numerous systems. the Design Sponsor is at liberty to adopt that style. or ‘cold conditions’.
The purpose of this NES is to stimulate identification of those aspects and features that need to be considered when preparing an STR.9. other mandatory features as given in the text of this NES.
1. equipment and the environment make it necessary to have a discipline in the preparation of STRs to assist in the:
marshalling and selection of those technical requirements to be included in the content of an STR which when implemented. are to be avoided and realistic temperatures with limits stated.
1. typographical and printing style to promote uniformity and thereby make use of STRs as easy as possible. should be specific and clear.NES 8 Issue 2 (Reformatted)
b. not by quoting references by which the contractor can.
b. security and privacy identifications etc as specified herein.
The product resulting from the application of an STR cannot be rejected due to failure to satisfy an assumed or unstated requirement. an authorization page to be signed by the Design Sponsor.
Design Sponsors are to bear in mind that every STR written by SSC personnel. systems and equipment. is issued under the delegated authority of DCW and DCWE.NES 8 Issue 2 (Reformatted)
1. who are accountable to the Controller of the Navy for the fitness for purpose of all SSC sponsored vessels. together with their machinery.
DCW and DCWE are accountable to the Controller of the Navy and are vested with the necessary design authority to make judgements and decisions on all matters of vessel and engineering design necessary to ensure that SSC sponsored vessels and their machinery.
the fitness for purpose of vessels.
c. Statements of Technical Requirements which specify the requirements to be satisfied to achieve fitness for purpose in the process of developing the design of vessels.2
Interactions between Development (of a Design) and Production
2. system or equipment.1
. machinery. although planned to be separate. Development and Production overlap. is initiated by defining the design in the form of a Configuration Definition and is completed with the availability of a product. the amount of Development is so insignificant that it is not contracted separately but is absorbed in the process of Production.
Ideally Development precedes Production in that:
‘Development’. (in the context of a vessel ‘Production’ is termed ‘Build’). machinery.
In practice there are occasions when:
Development and Production are entirely separate and full scale manufacture cannot be authorized until Development has been completed by the approval and sealing of the Configuration Definition.
b. setting design standards for the Controllerate. ie materiel in the form of a vessel. systems and equipment. systems and equipment (materiel). or how small or extensive the Development task. Development and Production unavoidably overlap.
Regardless of how Development and Production interact. materials and processes. and are programmed as one combined process.
2. by intent. systems and equipment procured by the Controllerate. it must always be separately identified and defined in an STR. ‘Production’. DCW and DCWE delegate to their Directors and their Staff design authority and accountability for:
b. and writing specifications for vessels machinery.1
SCOPE OF A STATEMENT OF TECHNICAL REQUIREMENTS Accountability
The documents by which SSC staff exercise design authority are:
Naval Engineering Standards which record the design standards that the SSC has established to be fit for purpose. (in the context of a vessel ‘Development’ is termed ‘Design’) is initiated by defining requirements in the form of an STR and is concluded with the availability of a Configuration Definition. systems and equipment meet the appropriate requirements. machinery.
to achieve fitness for purpose of existing MOD approved. provided all conventions and symbols are beyond misinterpretation and the package of information conveys the totality of the specification.b. features.6
An STR is not to contain matters such as responsibilities. It may:
define only the characteristics required in the final product. etc. the STR need only cover the changes required. testing and process controls to achieve the required characteristics. The descriptive matter can include tables. which are to be included separately in a Procurement Specification of which the STR is an essential part. To exercise control over the Development of a new system or equipment.2
An STR is to be so complete that the intent is clearly defined and not capable of being misunderstood. and STRs prepared for each work package.4. or stipulations that do not contribute to the primary intent of the development. ordering quantities.5
a. liabilities. flow and operational charts. Such matters are to be included in the contract that enforces the Procurement Specification. Project Definition.
e. etc. commercial product.3
a. or of a Defect Report) then such a Report can be embodied into and used as the basis of an STR provided that it is qualified and augmented to fulfil Clause 2. in some cases. also define design requirements. diagrams of all types.
When only limited Development. Feasibility Studies. the total task may be broken down into manageable packages (involving possibly Concept Studies.
2. also define or give guidance concerning the use of standard parts. graphs. interfaces.
The depth of technical stipulation in an STR can vary from a concise statement of the basic operational parameters through to virtually a complete written definition of the design. etc). or foreign materiel is necessary. nor is it to contain conditions of contract.
2.NES 8 Issue 2 (Reformatted)
An STR can be totally descriptive or descriptive and pictorial. define mandatory methods of production.4
In cases where development of a design is to be progressed as a result of a Technical Report (eg as the result of a development task in a staged development programme. also define the quality assurance requirements that demonstrate fitness for purpose.
2. processes. programme etc.
2. but it is not to include irrelevant or superfluous information. formulae etc and the pictorial matter can be conventional design drawings.
c. take account of changes in technology and of experience gained in MOD Naval Service and in industry. technical requirements including interface
be realistic in that requirements must always take into account both the operating implications and cost of material and be so stipulated that they may be complied with and verified in an economic and practical way. record lessons learned during development and inservice for future guidance. be clear and unambiguous and not embody preconceived ideas that could inhibit the development of a solution. make as much use of existing specifications and designs as possible.NES 8 Issue 2 (Reformatted)
When preparing an STR the basic principles are that it is to:
be adequate for the intent and no more. and includes a number of indexes which facilitate identification of and access to all the subject matter in NES and in other selected Standards.
(5) (6) 2. equipment or system for which a suitable product or suitable Standard already exists. British Standards (BS). Their purpose is to provide the basic technical documentation recording the knowledge and needs that are an essential foundation for the procurement and upkeep of Naval Ships.3
d. in particular NATO Standardization Agreements (STANAGs). If no suitable British Standard exists service interests may be covered by a Defence Standard which may be either general or. record proven design and materiel practices suitable for future use without anomaly or undue duplication. NES are a coherent series of Standards. component.
provide a reference standard for the preparation of documentation associated with initial procurement. take account of International. and Defence Standards (DEF STANs). process.
In drawing up an STR the Design Sponsor must make maximum use of Standards and must not cause to be developed any material. stipulate essential requirements. The SSC may produce an NES if no suitable British Standard or Defence Standard exists. NES 2 gives a complete index to Naval Engineering Standards.
. applicable to only one Controllerate.
2. ABCA Navy Standardization Agreements (NAVSTAGs). in service support. Their aim is to:
b. item. be contractually enforceable. in some cases. National and Commercial Standards. refitting and modernization.
It is Government policy for Government Departments to contribute to and make maximum use of British Standards.7
a. Ship Systems and Equipment and Weapon Systems and Equipment.
Many NES contain proposed ways of satisfying requirements when such are stated to be necessary. both in terms of technical requirements and cost of implementation. Referencing and quoting the Standard in an STR not only implies that the Standard is deemed to be adequate and technically suitable for the purpose. NES 122. or which may require amplification or qualification such as those providing options. g. Bending of Pipes.
j.) and the full text that is to be observed is not included verbatim in the STR (Clause 2. and the STR must qualify the NES. includes design practices and techniques for satisfying diverse features of all types and sizes of rotating machines. but also that the cost of implementing the Standard is acceptable within the expenditure allocated to the product. It need not then be quoted as a reference document for the STR.4
f.h. The extent to which Standards are quoted in an STR is dependent on the nature and purpose of the development.
i. no one machine can possibly have all the features.
l. the response to the Check List is to be included in the text of the STR and the completed Check List included as an Annex to the STR.8. and the extent of the information to be used is insignificant when compared with the whole Standard. to the extreme where a particular requirement of a Standard is to be a mandatory requirement of the STR.
Standards must be used in a way which provides a cost−effective solution. NES 102. When it is a mandatory requirement to observe an existing Standard.
h. For instance. Wood Decking—Caulking Compound.g. and NES 156 Part 2. Oil Pollution—Prevention. NES 322. NES 701 and many others.
k. but even in such cases the Design Sponsor is to ensure that this is confirmed. In cases where it is desirable for the STR to implement a Standard. The depth of the precise stipulation may vary from merely quoting a Standard in its entirety. Many NES carry Check Lists that refer to Clauses in the NES whose applicability to the particular application needs to be determined.
m. such a requirement is to be
2.) the precise identity of the Standard is to be included in the text of the STR and also listed as a mandatory reference in the ‘Introduction’ to the STR. to foster an awareness of the scope of such a Standard and the fact that its requirements need to be taken into consideration. NES 627. are examples of NES that can be applied without qualification. Where such an NES is referenced in an STR. then it is permitted to extract and repeat the information in an STR and quote the source reference. Standards must not be applied in a way which inhibits innovation. In cases where the Design Sponsor and NES Sponsor agree to the specification of a new requirement. NES 743 Part 1. The same applies to NES 302.8. Maintenance Envelopes and Removal Routes. provided that in such cases no further need is seen for the Standard in the STR. Particular care is to be taken when referencing NES because there are few NES that can be quoted without qualification. he must seek the approval of the Sponsor of the NES in accordance with NES 0.NES 8 Issue 2 (Reformatted)
n. in whole or in part (Clause 2. In cases where the Design Sponsor knowingly departs from the requirements given in an NES. Requirements for General Application to Rotating Electrical Machinery.
supplied. In essence.
2. Carrying out or arranging for the carrying out of any necessary research in connection with articles and substances with a view to the discovery and.
In preparing an STR the Design Sponsor is to be mindful of his duties under the Health & Safety at Work Act and is to give information and include requirements and tests to demonstrate compliance with the Act. erectors. In cases where the NES Sponsor does not support the proposals of the Design Sponsor. manufactured.
2. as appropriate. come into contact with the article that has been designed. so far as is reasonably practicable.9
a. The person employed is deemed to include all persons who may during the course of employment. stockholders and issuers of stores. installed. the MOD and its personnel have responsibilities as designers.5
. importers. the elimination or minimization of any risks to health or safety to which they may give rise. erected. the duties of the designer include. Ensuring that adequate information will be available in connection with the use of the substance at work. about the results of any relevant tests which have been carried out. suppliers. manufacturers. and any conditions necessary to ensure safety and absence of risk to health when put to that use. the Design Sponsor is. the following:
Ensuring so far as is reasonably practicable that articles and substances for use at work are safe and without risk to health when properly used. so far as is reasonably practicable. about the use for which it is designed and has been tested. to accept responsibility for the departure from the NES. Carrying out or arranging for the carrying out of such testing and examination as may be necessary for the performance of the duty imposed by (1) Ensuring that adequate information will be available in connection with the use of the article at work. imported.
b. For the purpose of the Act:
‘Work’ means work as an employed person.NES 8 Issue 2 (Reformatted)
included in the STR and subsequently incorporated in the NES. installers. and any conditions necessary to ensure that it will be safe and without risk to health when properly used. through his Line Management. ‘Article’ is seen to be synonymous with ‘product’ in that it includes components. that nothing about the way in which it is erected or installed makes it unsafe or a risk to health when properly used. Ensuring that any person who erects or installs any article for use at work in any premises where the article is to be used by persons at work is aware that it is his duty to ensure. equipment systems and ships.
Under the Health & Safety at Work Act 1974. or issued as stores.
Essentially every STR is to include: (1) Preliminary pages These are to identify and provide for administrative control of the document. The text of the resultant documentation is to be grouped into Sections. By regarding a vessel as a complex integration of systems and equipment. 2 or 3.1
. the total design requirements for a vessel can be specified by the identification of a unique collection of interrelated STRs. (5) SECTION 4—MISCELLANEOUS This Section is to include all aspects that do not fall within Sections 1. or harmonize with the example included as Annex A to this NES. (4) SECTION 3—QUALITY ASSURANCE REQUIREMENTS This Section should cover the requirements for Quality Assurance plans and organization together with the examinations. The preferred arrangement and content of an STR is to follow. A number of pages are mandatory. 3. (3) SECTION 2—TECHNICAL INFORMATION In this Section the technical requirements are to be described in such detail as appropriate to the purpose of the STR.
3. c. The layout of information on the cover of an STR is to be generally in accordance with that shown in Annex A and is to include the following information as appropriate: (1) Title The Title is to be as brief as possible.1
ARRANGEMENT AND CONTENT Structure
a. tests and trials. sequentially numbered using a decimal system. to be conducted to demonstrate the acceptability and adequacy of the developed solution to satisfy the STR.
a. Titles are to embrace the overall content of the STR.NES 8 Issue 2 (Reformatted)
3. In most cases this includes requirements and descriptions relating to performance. Paragraphs and Sub-paragraphs. omitting or adding sections and Paragraphs as appropriate. design and reliability.
3. but not so brief as to risk ambiguity.
d. and these are indicated in Annex A (2) SECTION 1—INTRODUCTION This Section is to set the scene for the development to be undertaken. It is to give background information that indicates how the work package interrelates with other work and can indicate the use that will be made of the information obtained as a result of the development.
a. When an STR is altered or updated to take account of changed requirements the updated document is to bear a sequential Issue Number. each document of the series is to be given an appropriate sub-title and Part Number.4
Issue and Date The initial issue is to be Issue 1 and the Serial Number and Date of Issue are to be included on the front cover. or reproduces extensively.
3. Every STR is to contain an authorization signed by the Design Sponsor to certify that the document is a true and proper stipulation of the design requirements. information contained in a classified or privacy marked NES. In cases of doubt the NES Sponsor is to be consulted.
Part Number and Sub-title In cases where Development embraces a number of distinct stages (eg Concept. Full Development). When an STR quotes. Part 1—Feasibility Studies. or it is convenient to divide Development into a number of self-contained tasks. The basic colour of the cover and back is to be: BLUE BUFF GREEN PINK for documents with no security classification for documents classified RESTRICTED for documents classified CONFIDENTIAL for documents classified SECRET
3. Every STR is to include a Conditions of Issue page similar to that included in the Annex A.4. A typical format for the page is given in Annex A.NES 8 Issue 2 (Reformatted)
Serial Number Every STR is to be given a Serial Number obtained from Section ME242. and a separate STR is prepared for each task.
Security Markings (a) STRs are to be given Security and Privacy Markings in accordance with MOD Manual 4 and JSP 184 as appropriate to the information disclosed. The Design Sponsor is to delete or add to these conditions as appropriate.2
. Only one number is to be used in the development of any one product. care must be taken to ensure that the STR does not jeopardize the security of the NES.
3. eg Statement of Technical Requirements for an Oil Fuel System.3
a. (See Clause 3.
Copy Number Copy Numbers are not to be given unless demanded by the security markings. or requested by the Design Sponsor to control distribution. The Serial Numbers run consecutively starting at STR 1. a Date of Issue and be re-authorized. Project Definition. Feasibility.
3. who maintain an Index of STRs.
a.NES 8 Issue 2 (Reformatted)
3. A listing for the STR: (1) (2) (3) (4) (5) Preliminary pages and their Titles Sections by numbers and Titles Group headings within Sections and relevant Paragraphs Annexes Applicable Drawings
3. The arrangement is to be as indicated in Annex C.3
a. Main text and Annex pages are to be numbered in sequence with Arabic numerals. Every page of an STR. Symbols are to be avoided in the text but may be used in equations and tables.NES 8 Issue 2 (Reformatted)
4. Only common terms and abbreviations as included in acknowledged references are to be used in the text.
4. c.1
. Rigid adherence to the style is not obligatory but departures from this style are acceptable only if the alternative is established and well known to those to whom the STR is directed.2
EDITORIAL. Where a requirement is mandatory and contractually binding this is to be indicated in the text by the use of appropriate wording. Consistency of terminology is particularly important.
a. Trade names.
4. The first time an abbreviation is used in the text it should be placed in parentheses following the word(s) and term(s) written in full.
4. 4. Right hand pages are always ‘odd’ numbers.
4. Paragraph and Sub-paragraph numbering
a. including any Annex. copyright names or other proprietary names applying exclusively to the product of one Company are only to be used when there is no alternative means of identification. Each Section. Uncommon terms and those with a specialized meaning are to be explained in the text or in a footnote or included in the list of definitions.
4. Paragraph and Sub-paragraph of an STR is to be numbered consecutively with Arabic numerals using a decimal notation. STRs are to be phrased in language free from ambiguity and in such terms that contractual implications are clear and enforceable. TYPOGRAPHICAL AND PRINTING STYLE Guidance
a. This section details a preferred style. is to have a unique page number. Preliminary pages are to be numbered in sequence with lower case Roman numerals in brackets. In Annexes the
4. The International System of Units as established by the International Standardization Organisation is to be used (See BS 5555). The page numbers are always to be at the bottom centre of each page. Short concise sentences and a minimum of punctuation aid reading and prevent misreading.8
Section. left hand pages being ‘even’ numbered. Where a statement is non-mandatory and expresses an aim or recommendation this is also to be indicated by appropriate wording.
b. and presented in the portrait mode wherever possible.2
. Such drawings are to be listed as Related Documents and attached to the STR documents in a suitable manner. these pages are to be identified as follows: (1) (2) Additions—by the number of the preceding page being suffixed by a capital letter eg 41. page and STR numbers are to be visible when the page is folded. Tables and equations are to be presented in accordance with Clauses 4. photographs and all forms of pictorial representation included in the text. ISO stencils are to be used for headings. Section 1. Each part of an STR is to be numbered as a separate self−contained document in accordance with the foregoing requirements.12.
4. Paragraph 1.1.
4. Deletions—by composite number on the preceding page eg 14/16 on page 14 to indicate pages 15 and 16 have been deleted.14
b. Figures are to follow as closely as possible to their first reference in the text. Colour is to be used only if essential.11
a. 41A.12
a. eg Annex A. The term ‘drawings’ is taken to embrace those drawings necessarily part of. Sub-paragraph 1—A. the STR. Figures of the text are to be planned to complement but not to duplicate each other.
4.a. Such figures are to be generally in accordance with JSP 183.10
4. Where additions or deletions affecting page sequence are made in circumstances in which it would be uneconomical to reidentify and reissue the remainder of the STR. Figures up to 75% of a page can be inserted within the text. etc.to 4. When figure(s) completely fill a page (ie a page without text) the page is to be numbered in sequence.12.1. The figure number and title is to be given at the bottom centre of the figure. but not bound in the cover of.
4. All drawings and figures are to be prepared in a form suitable for micro-copying.NES 8 Issue 2 (Reformatted)
numerals are to be preceded by the Annex reference. in Arabic numerals throughout the STR.
d. Figures are to be numbered sequentially. The term ‘figures’ includes sketches. FIB. diagrams. Figures are to be up to a size corresponding to the maximum typing area of the ISO A4 size sheet. If A4 size is not adequate a vertically folded figure may be included but its size and format must conform to the A3L style sheet defined in JSP 183 and the figure.9
NES. In addition to the requirements of English grammar. eg see Part 1 Section 2. Descriptive titles. Official code names. ie where the prefix ends and the root starts with the same vowel.
Abbreviations and code letters as specified in British Standards or other Standards. eg First of Class. (e) (f) (g) (2) Specific internal cross references. Ship compartment names eg Auxiliary Machinery Room (AMR).
4. co-ordinate.
Names of major pieces of equipment when used in the particular eg No 1 HP Compressor. eg AGOUTI. The size and style of the typeface. capital letters are to be used as follows: (1) Initial capital letters are to be used for: (a) (b) (c) (d) Note Trade names and names of proprietary articles.3
. LEANDER Class Frigate. Official names of equipment eg Gyro Compass Thermocouple NSN 6685−99−525−9879.17
a. In NATO Stock Numbers eg 6625−99−943−1534.
4. Follow-on-Ships. AMR.15
a. eg low-voltage battery. In such words as de-energize. Mk 19.
Small specifically referred items such as the ‘starter’ in No 1 HP Compressor starter shall have lower case initial letters. change-over switch.
4. Names of HM Ships or Class of Ship. the presentation of headings and the degree of indenting and spacing are to be as this NES.NES 8 Issue 2 (Reformatted)
4. Between two words grouped to form a compound adjective preceding a noun.
Full capital letters are to be used for: (a) (b) (c) (d) Abbreviated titles such as HMS. eg HMS BROADSWORD. Hyphens are to be inserted as follows: (1) (2) (3) (4) As used in other Standards such as British Standards or in the Concise Oxford Dictionary.16
a. Acronyms or letter groups used officially as short titles eg RICE (Rationalized Internal Communications Equipment). Titles and headings.
eg P2 not P2.
4.345 or 2 345). Oversize sheets ie laymark sheets with dual left and right hand markings are not to be used. (2) Stapling. Camera copy masters are to be standard A4 or A3 size. never by a comma or a point. The rules for component references on circuit diagrams also apply to component lists. Materials are to be selected from those listed in JSP 181. generally. Numbers of five or more digits are separated into groups of three counting from the decimal sign towards the left and the right.
4. The cover is to be card or manilla of weight not less than 157 g/m2. The solidus (ie oblique stroke) when used with quantitative abbreviations always denotes ‘divided by’ or ‘per’ and in this context may be used to write fractions and so maintain single line spacing.123.
4. not as subscripts.19
Use of Solidus
4. Commas are not to be inserted between digits of numbers (eg to indicate thousands).21
a. ie numbers in component references should be typed on the same line as the letter. Subject to a few exceptions such as A/S (meaning anti-submarine) the solidus is not to be used in word abbreviations.20
b. BS 5775 is to be followed but.22
c. eg rev/min.NES 8 Issue 2 (Reformatted)
4. These groups are to be separated by a small space. In numbers smaller than unity a zero should precede the decimal point eg 0.23
a. The Concise Oxford Dictionary is to be followed. Technical words not given in this dictionary are to follow the spelling given in Chambers Dictionary of Science and Technology. a four digit number is written without a gap (eg 2345 not 2. The decimal point is to be in the form of a point on the line. b. On camera copy the security classification or the privacy marking is to be in 12 Point capital letters. best white or good quality white paper of at least 80 g/m2 weight.24
4. where there is no decimal point.123 not . STRs are to be bound in one of the following methods: (1) in loose leaf form using either: (a) (b) Ring type stiff cover binder LOXON type binder
Both types of binder are to be in accordance with JSP 181.
All STRs are to be punched to the standard four hole format given in JSP 181.NES 8 Issue 2 (Reformatted)
.NES 8 Issue 2 (Reformatted)
BS 5775 DEF STAN 00−40 DEF STAN 00−41 DEF STAN 05−28
4. Annex C 4.12.10.9. 3.1.a.8 Introduction
DEF STAN 05−67 DEFCON 117/117A
Annex C 2.d.12..6. 4. units and symbols Achievement of reliability and maintainability MOD practices and procedures for reliability and maintainability NATO guide to the preparation of specifications for the procurement of defence material Guide to quality assurance in design Conditions relating to the supply of documentation for NATO codification purposes 4.9..8.9. 2.
Health & Safety At Work Act 1974 JSP 181 JSP 183 JSP 184
2.a. Test Annex C 4.a.19.9.a. RELATED DOCUMENTS
a.9.b.2.6 assurance (including reliability and maintainability) Specification for SI units and recommendations for the use of their multiples and of certain other units Specification for quantities.10. 2. Annex C 2.
MOD Manual 4 AQAP−l(Edition 3) NES 0 NES 2 NES 42
3.n.10.2.1 2. Reference is made to: Referred to in Clause BS 477B Glossary of terms used in quality Annex C 2.NES 8 Issue 2 (Reformatted)
ANNEX A.5 Equipment and Tools Requirements for Upkeep Annex C 3. A.4
NES 43 NES 44
Ancillary Support Equipment. 4.8.10. Documentation and Upkeep Evaluations 4.4.2.. Specifications for Technical Publications for the Services—Physical Standards Specifications for Technical Publications for the Services—Illustration Standards Specifications for Technical Publications for the —Security Requirements for Classified Technical Publications Ministry of Defence Security Regulations NATO Requirements for an Industrial Quality Control System Naval Engineering Standards Scheme—Policy and Procedures Index of Standards for Ships and Weapons Equipment Provisioning Requirement Sheets for DG Ships Sponsored Equipment 4.a.25.a.a.a.8 Annex C 2.23. Annex C 3.e.1
A.24. 4.8 Annex C 4.
NES 722 DG Ships 250B
SSCF 60 SSCF 73A SSCF 107 SSCF 128
RN Equipment Identification Certificate Annex C 4.2 Annex C 2.5.5 Annex C 4.5 Annex C 4.51 Annex C 4.4.5
ANNEX A.10.10.
A.10. 4.10.5 Annex C 4.3.6.10. 4.NES 8 Issue 2 (Reformatted)
NES 48 NES 54
Spares for Type A Support Supply of Information to Determine the Ship Fit of Equipment and Identification of Parts and Spares Requirements for Drawings Electromagnetic-interference and Susceptibility Requirements for Electrical Equipment for MCMV Manufacturers Recommended Spare Parts List List of Assemblies/Sub-assemblies to be provided with Spares Support Recommended List of ASE/CRETE/CUHTS/ CUMTE (NES 43)
Referred to in Clause Annex C 4.10.5 Annex C 4.4.10.5.10.
ANNEX B. B.
ANNEX B. There are no Definitions and Abbreviations for this NES. DEFINITIONS AND ABBREVIATIONS
. GUIDE TO THE ARRANGEMENT AND CONTENT OF A STATEMENT OF TECHNICAL REQUIREMENTS FOR THE DEVELOPMENT OF A SYSTEM OR EQUIPMENT
MINISTRY OF DEFENCE CONTROLLERATE OF THE NAVY SEA SYSTEMS CONTROLLERATE
GUIDE TO THE ARRANGEMENT AND CONTENT OF A STATEMENT OF TECHNICAL REQUIREMENTS FOR THE DEVELOPMENT OF A SYSTEM OR EQUIPMENT
SUB−TITLE
7 ANNEX C
2. 3. restrictive. worthy of amendment to permit a more-cost effective solution.
4. resources and financial arrangements governing the implementation of the Procurement Specification will be the subject of a contract placed by Director of Contracts (D of C). The management. or in any way unsuitable the Design Sponsor is to be informed through D of C.
6. If this STR is found to be inadequate. This Statement of Technical Requirements (STR) Number has been prepared by Sea Systems Controllerate and stipulates the requirements to be observed when developing This STR does not constitute an order to undertake the development. review and programming requirements associated with the work will be defined in a Procurement Specification that embodies this STR. Unless otherwise stated. The conditions.
Signed Design Sponsor Date for DCW/DCWE Published by: MOD(PE) Sea Systems Controllerate Foxhill. reference in this STR to any document means the issue and all changes current at the date of authorization of this STR.
ANNEX C C.8
This Statement of Technical Requirements (STR) has been prepared for the use of the Controllerate of the Navy (C of N.NES 8 Issue 2 (Reformatted)
CONDITIONS OF ISSUE General
1. those quoted may not necessarily be exhaustive.9 ANNEX C
. its servants or agents) for any deficiencies in design information where the STR is used for other purposes. It refers only to technical suitability and in no way absolves either the supplier or the user from statutory obligations relating to health and safety at any stage of manufacture or use. This STR may call for the use of processes. Where attention is drawn to hazards. or submission of the tender.
Tender or Contract Process
5. reproduced or published without written permission of the MOD.). must be returned on completion of the contract. It is not to be released. The MOD accepts no liability whatever whether in contract or in tort (including but without limitation negligence on the part of the MOD.
3. The information contained herein is Crown Copyright or may be subject to privately owned rights. The MOD accepts no liability whether in contract or in tort in respect of infringements of Third Party Rights. This STR is the property of the MOD and unless otherwise authorized in writing by the MOD. substances and procedures that may be injurious to health if adequate precautions are not taken.
4. in connection with which it is issued. Procurement Executive Ministry of Defence (MOD(PE)) and its contractors in the execution of Contracts for the MOD.
ANNEX C C.
. . . . . . . . . .1 Preamble . . . . . . . . . . . .
General . . . . . . . . . . . 2. . .2 Functional Characteristics—Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tender or Contract Process . . . . . .4 Production Test Specification . . . . . . . 3. . . . . . . . . . . .10 Operational and Training Aspects .4 Equipment Reliability . . . . .2 3. .3 2. . . . . . . . . . 2. . .9. . . . . . . . . . . . . . . .2 Notice for Use . . . . . . . . . . . . . .5 Environmental Conditions . . .2 3. . . . . . . 3. . .7 2. . . . . . . .1 3. 2. . . . .8 Reliability and Associated Criteria . . . . . . . . . . . . . . . .5 2. . . . .1 Packaging . .1
1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9. . . . . . . .2 Storage . . . . . . . . . . . .1 Quality Programmes and Plans . . 3. . . . . . MISCELLANEOUS . . R and M) . . . . . . .7 Compatibility and Interfaces . . . . . . . . . . .6 Equipment Life . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 4. . . . . . . . . . . . . . . . . . . . . . . . . . .9. . .
2. . . . . . .7 Reliability and Maintainability Programme . . . . . . . . . . . . . . . . . . .5 Configuration Definition . . . . . . . . . . . . . . . . . . . . 2. .1 4.1 3. . . . . . . . . .
4. . . . . . . . . . . . . .3 Equipment Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9. . . . . . . . . . . . . . . . . . . . . .2 Tests during Development . . . . . . .1 3. . . . . . .2 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Production . . . . . . . . .2 3. . . . . . . . . . . . . . . . . . . . . . . .NES 8 Issue 2 (Reformatted)
CONTENTS AUTHORIZATION . . . . . .5 2. . . . . . . . . . . . 2. . 2. . . . . . . . . . . . . . . . . . .5 Preliminary Qualification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . QUALITY ASSURANCE REQUIREMENTS . . . . .
3. . . . . . . . . . . . . . . . . . .8
3. . . Abbreviations. . . Health and Safety . . 2. . . . . . . . . . . . . . . . . . . .12 Constituents and Components . . . . . . . . .5 2. . . 2. . . .1 1. . . . . . . . . . . . . . . . . . . . . . . . 1. . . . . . . 2. . . . . . . . . . .9. . .1
2. . . . . . . . . . . . . . . . . . . . . . . .7 2. . . . . . . . . . 4. . . . . . . . . . . . . . . . . . 2. . . . . . . . . . . . . . . . . . . . . . . 3. . . . . . . . . . .1 Equipment Usage . . . .6 EMC Testings . .4 2. 2. . .8 2. . . . . . . . . . . . . . . . . . . .1 2. . . . . . 4. . . . . .3 Related Documents and Drawings . . . . . . . . . . . . . . . . . . . . . . . . . 3. . . . . . . . . . . . . . . . . . . . . .9 Specimen Paragraphs for Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 4. . .4 Test and Trial Sites . . . 2. . . . . . . . . . .8 Test Methods . . . . . . . . . .4 2. . . . . . . . . .1 4. . . . . .1 1. . . . . . . . . .6 2. . . . .1 2. . 3. . . . . . . . . . . .1 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
(v) C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONDITIONS OF ISSUE . . . . . . .4 Definitions. . . . 2. . . . . . . . . . . . . .3 Physical and other Characteristics . . . . . . . 2. . . . . . . . . . . . . . . . . . . . . . . . . . .11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Type Test Specification . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Scope . . . . . . . . . .5 2. . . . . . . . . . . . . . . . . . . . .7 Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. . . . . . . . . 3. . . . . . 2. . . . . . . . . . . . .3 Models and Mock−Ups . . . 1. .6 2. . . . . . . . .1 Description and Purpose . . . . . . . . . . . . . . . . . INTRODUCTION . . . . . .3 2. . . . . . . . . . . . . . . . . . .9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 3. . . .9 Nonconformance . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Safety . . . . . . . . . . . . . . . . . . . . . . . . . 2.6 2. . . . . . . . . . . . . . . . . . . . . . 4. . . . . . . . . . . . . . . . . . . . . . . . 2. . . . . . . . . . .1 1. . . . . . . . . . . . . . . . .
3. . . 4. . . . . . . . . . . 2. . . . . .
2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reliability and Maintainability.5 Equipment Maintainability . . . . . . . . TECHNICAL REQUIREMENTS . . . . . . . . . . . . . . . .
2. Symbols . . . . . . . . . . . .
1. . . . . . . . . . . . . .1
3. . .1 2. . . . . . . . . .9. . .6 Interchangeability . . . . . . 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
4. . (A. . . . . . . . . . . . . . . . . . . . .
1. . . . . . . . . . . .4 Design and Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 2. . . . . . . . . .
. . . . . . .8 Standards Information . . . . . . . 4. . . . . . . . . . . . . . . . . . .12 Development Models . . . . . . . . . . . . . .7 Design Acceptance . . . . . .1 4. . . . . . . . . . . .2
(vi) C. . . . . . . . . .2 4. .1 4. .6 Design Progress Information . . . . . . . . . . 4. . . .9 Installation Information . . . . . . . . . . . . . . . . .
4. . . . . . . . . .10 Support Information . . . . . .NES 8 Issue 2 (Reformatted)
4. . . . . . . .1 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. . . . . . . . . . . . . . . . . . . . .2 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
. . . 4. . . . . .1 4. . . 4. . . . . . . . . . . . .11 Design Disclosure . . 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
development models. f. Scope is intended to identify the extent and limitations of the subject matter covered by the STR.
1. It is to consist of a clear concise description of the subject covered. A Paragraph is to be included to the effect that in the event of apparent conflict between the STR and any related reference documents. Details are to be included in Section F ‘Miscellaneous’.4
Definitions. the STR is to take precedence.
c. under appropriate headings in the ‘Introduction’. restrictions or exclusions.1
a. 1. Documents and drawings to which reference is made in the STR are to be listed.
b. and symbols. All uncommon terms and abbreviations or those with specialized meanings. The content is to be complete and comprehensive and describe the item covered in terms which can be interpreted without ambiguity by contractors or others familiar with applicable technology and trade practices. e. The scope is to include reference to the supply of mock-ups. Abbreviations. Under a heading Mandatory References are to be listed those documents and drawings to which reference is made for the purpose of specifying a mandatory requirement. and state any options. In the case of conflict between referenced documents precedence is to be stated.
b. It can contain information as to the use of the product. together with the Paragraphs of the STR in which they are quoted. The identity of these documents and drawings is to be stated in such precision that there is never any likelihood of confusion with a similarly referenced requirement in another issue of the same document or drawing in the form Clause 0123 of NES 456.
d. It can sketch the reasons for undertaking the development task and the use that will be made of the information obtained as a result of the development. are to be listed in this Section.
Related Documents and Drawings
a. It is to be assumed that all related documents and drawings of all References are invoked unless stated to the contrary. all of which are to be included in later Sections.
1. special development rigs and any special facilities to be provided during the development. The source of supply of all Referenced documents is to be stated.2
a. 1. Under a heading References are to be listed those documents and drawings to which reference is made for the purpose of indicating a general requirement for which a precise stipulation is not necessary. eg DEF STAN 00−00. Issue 7 with Amendment 8.1
C. The preamble is to provide relevant background information and is not to be used to state technical requirements.13 ANNEX C
. The identity of these documents and drawings is to be stated in a manner that identifies the nature of the requirement without recourse to identifying the clause or paragraph of a particular document.
Performance requirements for the various operational phases and modes of system operation. the materials. including performance acceptance limits.
b. velocities.3
a. Dynamic characteristics. at least. models etc. directly or indirectly. together with the necessary provisions for updating. The full definition of the equipment is to be given. is to be included. Requirements necessary to ensure physical compatibility with other equipment are to be included. are to be specified. A comprehensive description of the equipment is to be given. Special provision relating to drawings or other specific transmission of information is also to be given in this paragraph. A statement is to be made regarding any hazards which the equipment could encounter. Quantitative criteria under stipulated environmental and other conditions. on those properties.1
C. A list of the main constituents distinguishing between those which are to be developed and those which are to be supplied from other sources is to be included. ie what is expected of the equipment. e.
b. including references to relevant drawings. In general.
Functional Characteristics—Performance
a. eg rate. including the overall purpose and basic parameters which are to be recognized in the design and the anticipated usage.15 ANNEX C
. These characteristics are to include general and detailed requirements. The relationship of the equipment to the overall system of which it is a part. or can be included in the ‘Miscellaneous Section’. movements etc. as well as their influence on the development programme.
c. for all the performance requirements. both upper and lower performance limits are to be given. d. under appropriate sub-headings. the scales to which they are to be made.1
TECHNICAL REQUIREMENTS Description and Purpose
2. The requirements for mock−ups. eg range of output performance parameters with associated input parameters.
2. including logic and block diagrams.NES 8 Issue 2 (Reformatted)
2. c. such considerations as: Qualitative characteristics. These characteristics are to include general and detailed requirements relating to the physical properties of equipment together with any other requirements which impinge. Normally the Section is to include. 2. e. and the extent to which they are representative of a finalized item.
d. these are to include Upkeep Policy.16
. must stipulate the need for compliance with the applicable National Safety Codes. and requirements covering the use of preferred materials. biological. and repair parts are to be stated. including fail safe and emergency operating restrictions. including space for contained materiel. Durability factors to assure adequate ruggedness.
The following at least are to be covered:
(1) (2) (3) (4) (5) (6) (7) 2. Sealing against adverse environmental conditions. In particular. Requirements relating to ergonomic suitability of man−machine interfaces for variations of operators size and strength capability are to be given. abrasion etc. and emergency and standby circuits etc. operational layout ingress. this is to be stated. radio active products. where appropriate the requirements for the avoidance of equipment instabilities are to be stated. c. Overhaul Cycles. ‘Human Factors for Designers of Naval Equipment’ refers. These are to include appropriate design standards. exits and access for maintenance. Identification nameplates and markings for stock control. in accordance with DG Ships 250B.
a. are to be specified. Maintainability requirements are to be stated. processes etc. Dimensional limits. 2. care is to be taken to distinguish between static and dynamic conditions. In formulating the strength and integrity requirements. Safety requirements are to be specified. radiological effects.NES 8 Issue 2 (Reformatted)
b. Minimum and essential requirements that are not determined by the performance characteristics or interface requirements are to be specified.
e. Protective coatings to assure protection from corrosion.
f. Upkeep by Exchange features etc. eg toxic.
i. Design and construction requirements pertaining to electromagnetic compatibility are to be stated in terms of the environment which the item has to accept and which it generates. parts. equipment or both. together with design constraints and standards necessary to assure compatibility of hardware. Minimum design construction standards applicable to the class of equipment in question.
C. Health and Safety Criteria in relation to explosive.4
Mass limitations. standard commercial components. crew space. Specifications requiring or authorizing the use of dangerous.2
b. interlocks. Vulnerability factors. h. to preclude or limit hazards to personnel. if compliance with specified International Standards is a requirement. replacement.
17 ANNEX C
. The levels at which interchangeability or replaceability are required are to be stated. including sea fog Shock and acceleration levels Vibration.3
b. together with the physical and functional interchangeability 2. and requirements for the use of production techniques during prototype manufacture. The environmental conditions and limitations applicable throughout the life of equipment.
The requirements for workmanship standards to be achieved in development models. transportation. including the vibration during motion or weapon operation Sea state and turbulence
(10) Noise (11) Dust or sand (12) Infestation and attack by micro organisms (13) Radiation including solar radiation (14) Nuclear explosives effects (eg EMP) (15) Electrical. are to be stated. ie production.NES 8 Issue 2 (Reformatted)
j. operation. cycles of environmental conditions and rates of variation are also important and are to be specified where applicable. magnetic and electromagnetic effects (eg EMC) (16) Solid particles and fluids (17) Chemicals (18) Contamination by fluids. installation. disposal and storage.
2. are to be stated. chemicals etc (19) Flammable or explosive atmospheres. including:
Temperature Pressure Humidity Ice and snow Rain. water and salt spray Fog. It is important to state these as combinations in cases where the combined effect is more serious than in each separate condition. The duration of exposure.
a. Self induced conditions are to be included when framing requirements for protection against specified environmental conditions.
The apportionment of reliability to sub-assemblies and components is to be given in as much detail as available and the extent to which such data has been used in meeting this requirement is to be defined. are to be clearly identified. The interfaces between the equipment to be developed and other equipment.NES 8 Issue 2 (Reformatted)
characteristics relating to the installation of components. time between maintenance actions. such as availability.
2. or a major sub-system or components. eg turnround time. The procedures for assessing such factors are to be specified.7
f. vibration characteristics. Interface characteristics which change as a result of different users or operational modes. variety of support equipment. Rate.
Time. operational life.
e. eg frequency of preventive maintenance. realistic reliability requirements are to be determined and incorporated later in the STR together with the requirements for any demonstration. c. eg number of people and skill levels. 2.
2. accelerations. shelf life. Weight and dimensional parameters for modular construction and for test equipment access. eg inputs. It may also be appropriate to specify requirements for other factors. Complexity. The reliability of a product under development is difficult to assess even with a knowledge of the reliability of its components. Physical interface relationships are to be expressed in terms of dimensions with tolerances. loads. temperatures.8
Reliability and Associated Criteria
a. or life between overhauls.18
. Reliability is an important criterion and is to be stated numerically with confidence levels in terms of mission success or hardware mean time between failures.
d. The reliability can be stated initially as a goal with the lower minimum acceptable requirement. Maintainability requirements are to be expressed in quantitative terms. time for repair. The overall reliability required is to be apportioned between the separate functional areas so that each may be developed with a view to achieving the desired overall reliability.
Requirements resulting from the proposed use of automatic test equipment for maintenance purposes are to be specified.4
C. outputs. tools and gauges to verify interchangeability is to be stated. such as:
b. The need for jigs. irregular movements etc. c. In this case. The requirements for reliability and life expectancy are to take into account the environment and uses to which the equipment is to be subjected. Diagrams should be provided to aid interface definition.
b. speeds. are to be specified in quantitative terms.
Equipment Reliability a.19 ANNEX C
. In respect of failures which are not repairable at sea. 2.
2. Reliability and Maintainability.1
Equipment Usage a. c.NES 8 Issue 2 (Reformatted)
Mins or Mins or Mins or Mins or
hours from non-operational state hours during daily preventive maintenance hours during weekly preventive maintenance hours during monthly preventive maintenance. not less than Not applicable to equipment which cannot be repaired at sea. The manner in which requirements for A. The probability that the equipment will be available. 2. The downtime due to preventive maintenance activities during the operational hours. without failure is to be greater than
Specimen Paragraphs for Availability.2
Notice for Use a.9. (ie not undergoing corrective maintenance).
Requirements for on board repair by substitution of components. the equipment is to be retained use for in an operational state unless undergoing corrective or preventive maintenance. R and M may be specified depends on the application of the equipment. are to be defined. The time during which the equipment is to be in an operable state to start a mission. the probability that the equipment will survive the maximum operational period at the stated usage %. eg replacement of a faulty part or module of an electronic item. Typical examples are given below and are taken from specimen paragraphs for the preparation of Staff Requirements Naval. (A.9. is to be specified.
2. When not in use.5
b. R and M)
a. at any instant during the operational period is to be %. Note It may be appropriate to specify different usage patterns for each sub-system. The time required to bring equipment to full operational use is not to exceed:
2. These paragraphs may be amended to take account of multi-mode operation.9. period is not to exceed Sufficient onboard spares are to be scaled such that the risk of stock-out would be less than %. environmental conditions or the use of existing commercial equipment.
Note b. days the equipment will be in During a maximum operational period of hours per day.9. i. eg the availability.
Equipment Availability a.
hours the probability that the equipment will survive a period of continuous operation without such a failure is to be greater than %.5
Equipment Maintainability a. 2. and where appropriate to demonstrate the achievement of the Availability. A survey of failure data on similar equipment is to be undertaken including: (a) Brief history of design offered.
. Design Check List. The total expected service life replacement is not to be less than years. In general. from first fit to final disposal of last equipment is
In respect of failures which are repairable at sea during the operational period. Reliability and Maintainability requirements is to be formulated in accordance with DEFSTAN 00−40. rebuilding or years.
Novel Features Analysis. Note This format assumes a log normal distribution of active repair times for which a maximum repair time of three times the median repair time for electronic equipment and five or more times the median for mechanical equipment will be applicable (BS 4778 1979 refers).9. date entered service. user environment for which designed.NES 8 Issue 2 (Reformatted)
b.9. One or more of the following may be helpful:
Historical Data Survey. The Median active time (50 percentile) to restore or repair the equipment after failure using specified procedures and resources is not to be greater than minutes. such as is likely to occur in multi−mode operation. a failure is deemed to occur whenever the level of performance falls below that necessary for the equipment to achieve its operational aims. compiled from DEFSTAN 00−41 (Part 4) Section E or from an applicable Naval Engineering Standard.
2. the levels of failure are to be identified. A listing of the features of the design which are new to Naval service is to be made. A design check list is to be completed. known causes of failures and details of modifications. The above is a minimum requirement and it may be necessary to give further guidance on the extent of the R & M programme expected for the purpose of agreeing costs.6
C. The programme of work to give assurance of. The maximum (95 percentile) active repair time is not to be greater than minutes. Summary of operating experience.7
Reliability and Maintainability Programme a. total number equipments produced and total time in use to date.9. When doubt exists as to what constitutes a failure.6
Equipment Life a. The intended life of the equipment between major overhauls. with a justification for each.
The analysis is to provide an estimate of the times for all diagnosis and repair actions assuming test equipment.21 ANNEX C
b. Requirements on the standard of workmanship are to be stated when it is pertinent to the finished quality of the product. A Criticality Analysis is to be carried out in accordance with DEFSTAN 00−41 Part 4 Section D subsequent to the conduct of an FMEA. The Equipment Designer is to submit an FTA proposal to the Design Sponsor for approval.
b. Fault Tree Analysis. Requirements are to be specified in numerical form and are to include such items as numbers and types of personnel necessary for the operation.
. Maintainability Analysis. c.10
Operational and Training Aspects
a. reference to specified processes is to be avoided as it could restrict new developments or inhibit the use of more economic techniques. The proposal should detail the work package necessary to give assurance on the types of possible failure modes. to the extent that the requirements define or constrain design of equipment. using maintainability data from approved sources. The FMEA is to form a basis for a Maintainability Analysis identifying the corrective maintenance necessary in the event of any failure and where it should be carried out.7
C. Specific tests are not to be included under this heading. The Equipment Designer is to submit a CA proposal to the Design Sponsor for approval. The proposal should detail the work package necessary to give assurance on the probability of failure of the equipment in a defined mode. maintenance and control of the equipment. A Fault Tree Analysis is to be carried out in accordance with DEFSTAN 00−41 Part 4 Section B. In other cases. Design Review.11
2. or production methods are to be specified when the equipment is critically dependent upon them. spares and manpower available. Any requirements to be met by the contractor relating to personnel training. or equipment facilities are to be specified. An FMEA is to be carried out in accordance with DEFSTAN 00−41 Part 4 Section C on the equipment is defined in. Requirements for particular manufacturing processes. This Paragraph is to give requirements relating to manning. the means of detecting failures and the compensating provisions in the design. The Equipment Designer is to submit a proposal for the conduct of the FMEA to the Design Sponsor for approval. Proposals for conducting the Maintainability Analysis are to be submitted by the Equipment Designer to the Design Sponsor for approval. Criticality Analysis. Design Reviews are to be conducted in accordance with DEFSTAN 05−67 at which documentation on the above R & M activities and other quality assurance aspects are to be presented. 2. being covered under Quality Assurance Requirements.
2. the severity of the effects. operational and logistic support of the equipment.
2. considered to be necessary for preventing damage or recovery of the item in the event of breakdown. Restrictions arising out of the emergency operation of equipment (ie the operation of standby circuits and interconnection and any redundant circuits).NES 8 Issue 2 (Reformatted)
2. or that such requirements are implicit in the STR for the equipment. assembly. Vigilance is to be exercised to ensure that the technical requirements for constituents of. starting up and maintenance operations are to be stipulated if they are not covered elsewhere in the Statement of Technical Requirements or by standard industrial practice and existing Standards. dismantling.
b. Requirements relating to safety during handling. and components for. an equipment are adequately specified in identifiable Standards. storage.12
a. are to be stated.22
. manufacture.13
ANNEX C C. testing. transfer. Specifications or other STRs.
not in the STR itself.9. However.5
Preliminary Qualification Tests
a. The need is to be stated for a Production Test Specification that includes tests to ensure compliance with the design intent. in preparing an STR.
c.2 to 3. The responsibilities for the preparation of. or the need to obtain the approval of the 3.8).
d. the contractor is required to document his intended quality assurance arrangements.1
QUALITY ASSURANCE REQUIREMENTS Quality Programmes and Plans
3. Programmes in the Quality Plan are to be co-ordinated and integrated with any programmes or plans required for reliability. When AQAP−1 (Edition 3) is called up in a contract. The requirements for formal tests during development are to be stated. maintainability.2
a. will be called for in Development Contracts. The need is to be stated for a Type Test Specification that defines the tests that need to be undertaken during development and audited during the process for acceptance. together with those tests that are to be undertaken as part of the process of acceptance.3
Type Test Specification
3. etc (See Paragraph 2. the Design Sponsor must bear in mind these administrative requirements and is to include technical requirements that enable achievement of the Quality Plan. safety. they may include: (1) (2) (3) (4) (5) (6) (7) Operational capability verification Engineering evaluation Performance verification Reliability testing Assembly and installation testing Testing to demonstrate any novel features of the design Maintenance Evaluation (See NES 44). Features that may need to be included in the Quality Plan are in Paragraphs 3. Management organizations and programming requirements of the Quality Plan are to be included in the Procurement Specification that embodies the STR.
3. The requirements for preliminary qualification tests are to be specified. (as demonstrated during acceptance by application of the Type Test Specification). which supplements the contractor’s general system.23 ANNEX C
. Normally a Quality Plan.
3. during subsequent production runs. specific to the contract.NES 8 Issue 2 (Reformatted)
3. and to ensure that both the functional and mechanical interchangeability are maintained.
reference is to be made to that documentation. When such procedures are given in existing documentation. For certain tests.
Nonconformance a.
3. The need is to be stated for the equipment to be EMC tested to the requirements of DG Ships 250B and whether an EMP test is to be included. power sources and environmental conditions are to be given.NES 8 Issue 2 (Reformatted)
Quality Assurance Authority for. instruction is to be given as to which of the other tests such as functional and accuracy. are to be included as an integral part of the particular test. acceleration. if appropriate. Test methods and procedures are normally to be those officially recognized.
3. qualification tests are to be specified if not covered by National procedures. eg cold. are to be stated. such powers of approval being delegated. or when individual items do not attain the required level of performance against correctly applied tests. shock. Procedures to be followed when nonconformance with the STR is revealed during the design development process. vibration.8
ANNEX C C.7
a. to the official Quality Assurance Representative. Guidance on the test equipment.24
. When this is not possible the methods and procedures used by the manufacturer are to be subject to approval by the Design Sponsor.
4. qualifying NES 722 as necessary. giving purpose. outline descriptions and interface information to include in a list type NES. The Design Sponsor is to state the type. Requirements for installation drawings.1
a. level of manning required and anticipated usage. The Design Sponsor is to state whether the configuration definition. quality and quantity of drawings.6
Design Progress Information
4. the division of responsibilities is to be stated. giving scale. cleaning.25 ANNEX C
Models and Mock−Ups
4. Detailed requirements are to be stated for test and trial sites to be hired or constructed. accuracy.9
a. to be provided as part of the development.4
Test and Trial Sites
a. Methods to be used for dismantling. dehydrating. packaging.
4. and thereby accept the design presented as satisfying the Statement of Technical Requirements. Special provisions to be made for storage and handling are to be stated.
4. Detailed requirements for models and mock-ups are to be stated. extent and date required. The Design Sponsor is to state the requirements for the quality and extent of the manufacturing drawings to be provided as part of the configuration definition.
4. calculations. The first alternative is to be adopted only after reaching agreement with D of C that the requirement to seek competitive tenders on production orders can be waived. is to be stated. or the need to prepare a complete NES.
a. The need for drawings.1
C. In the case of more than one Authority.7
a. is to be merely the minimum suitable for the product to be manufactured in the development contractors organization.
4. or whether the configuration definition is to be the minimum necessary for manufacture by any other contractor. or installation instructions are to be stated.
4. The Design Sponsor is to state the Authority who is to apply the Type Test specification. specifications etc that need to be supplied to him to enable progress monitoring of the development. and protective measures to prevent deterioration are to be stated if they influence the design of the equipment. date required.
e. ‘X’ and ‘Y’ models and preproduction manufacture required during development are to be stated. that enable the nature and purpose of the items to be recognized from the identifying data that is given on the Forms SSCF73A.a. that are required by para 2.26
. to identify the intended Vessel−Fit equipment and its parts.NES 8 Issue 2 (Reformatted)
4.2.a. are to be recognized. to enable NATO Codification of the equipment and of all parts of it that may be required by MOD to be made RNSTS Items of Supply. will not be carried out until Modification State Zero drawings and associated Forms SSCF60/107/73A etc. trials etc conducted during development is to be stated.12
Development Models a. (see NES 54 and NES 48). (see NES 42).
d. Requirements are to be stated for drawings. Details of ‘breadboard’ models.a to be stated. Exchange features. and reference is to be made to associated Contractual Terms that are (to be) included in the Contract Letter.a.
c. The need for the contractor to record and retain systematically queries.11
Design Disclosure a. decisions. using SSCF73A. The supply of data as and when specifically called for by the Ministry. as expressed in the EPRS.
f.2. SSCF128. Forms SSCF73A are to be associated with General Arrangement Drawings. Pamphlets. (see NES 43).a. and documentation that must be provided during (Design) Development as a basis for Support documentation. Maintenance Envelope drawings are to be produced in accordance with NES 302.2
ANNEX C C. Overhaul Cycles.4. and they are to form part of the definition of the requirements of the Maintenance Evaluation. A requirement is to be stated for recommendations to be provided for (a) a List of Spares.
b. The Upkeep Policy. etc. using SSCF128.7.7. Intellectual Property Rights (IPR) that may affect the data of 4. and are to be stated as required to be catered for in the Development drawings etc. NES54 and DEFCON 117/117A are to be identified as being relevant to any ensuing Production Contract. Full identification and NATO Codification. is to be identified as a requirement. are available.10
a. of para 3. (see NES 44). and are to be reflected in Equipment Requirements Provisioning Sheets (EPRS). records.
4. The Forms SSCF73A and SSCF128 are to be completed with Drawing and item data as is available at the then state of Drawing production. These recommendations are to be compatible with the requirement of para 2. and with the results and Report of the Maintenance Evaluation of para 3. specifications.
4. etc. and (b) an associated List of Tools. (in accordance with NES 54).4.
It is important that users of Defence Standards should ascertain that they are in possession of the latest issue or amendment. Any person who. Information on all Defence Standards is contained in Def Stan 00-00 Standards for Defence Part 3 .uk File Reference The DStan file reference relating to work on this standard is D/DStan/69/02/8. Contract Requirements When Defence Standards are incorporated into contracts users are responsible for their correct application and for complying with contractual and statutory requirements.© Crown Copyright 2000 Copying Only as Agreed with DStan
Defence Standards are Published by and Obtainable from: Defence Procurement Agency An Executive Agency of The Ministry of Defence Directorate of Standardization Kentigern House 65 Brown Street GLASGOW G2 8EX DStan Helpdesk Tel 0141 224 2531/2 Fax 0141 224 2503 Internet e-mail enquiries@dstan. Compliance with a Defence Standard does not in itself confer immunity from legal obligations. Index of Standards for Defence Procurement Section 4 ‘Index of Defence Standards and Defence Specifications’ published annually and supplemented regularly by Standards in Defence News (SID News). Revision of Defence Standards Defence Standards are revised as necessary by up issue or amendment.mod.
. when making use of a Defence Standard encounters an inaccuracy or ambiguity is requested to notify the Directorate of Standardization (DStan) without delay in order that the matter may be investigated and appropriate action taken.
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