Z23

Z23(July 2006)(Rev.1Mar 2007)(Corr.1
Oct 2007)(Rev.2
Apr 2009)(Corr.1
Aug 2012)(Rev.3June 2013)(Rev.4
Mar 2014)(Rev.5
Feb 2015)(Rev.6
Nov 2016)(Rev.7
Oct 2020)(Corr.1
Oct 2022)(Corr.2
May 2023)

Hull Survey for New Construction
1. Scope
The scope of this UR includes the following main activities:
1.1
Examination of the parts of the ship covered by classification rules and by applicablestatutory regulations for hull construction, to obtain appropriate evidence that they have been
built in compliance with the rules and regulations, taking account of the relevant approved
drawings.
1.2
Appraisal of the manufacturing, construction, control and qualification procedures,
including welding consumables, weld procedures, weld connections and assemblies, withindication of relevant approval tests.
1.3
Witnessing inspections and tests as required in the classification rules used for ship
construction including materials, welding and assembling, specifying the items to be
examined and/or tested and how (e.g. by hydrostatic, hose or leak testing, non destructive
examination, verification of geometry) and by whom.
Note:
1.

This UR is to be uniformly implemented by IACS Societies on ships contracted forconstruction on or after 1 January 2008.

2.

The “contracted for construction” date means the date on which the contract to build thevessel is signed between the prospective owner and the shipbuilder. For further details
regarding the date of “contract for construction”, refer to IACS Procedural Requirement(PR) No. 29.

3.

The changes introduced in Revision 2 of the UR are to be uniformly implemented by
IACS Societies on ships contracted for construction (as defined in IACS PR 29) from
1 July 2010.

4.

The changes introduced in Revision 3 of the UR are to be uniformly implemented by
IACS Societies on ships contracted for construction (as defined in IACS PR 29) from
1 July 2016.

5.

The changes introduced in Revision 4 of the UR are to be uniformly implemented by
IACS Societies on ships contracted for construction (as defined in IACS PR 29) from
1 July 2016.

6.

The changes introduced in Revision 5 of the UR are to be uniformly implemented by
IACS Societies on ships contracted for construction (as defined in IACS PR 29) from
1 July 2016.

7.

The changes introduced in Revision 6 of the UR are to be uniformly implemented by
IACS Societies on ships contracted for construction (as defined in IACS PR 29) from
1 January 2018.

8.

The changes introduced in Revision 7 of the UR are to be uniformly implemented by
IACS Societies on ships contracted for construction (as defined in IACS PR 29) from
1 July 2021.
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1.4
Appraisal of material and equipment used for ship construction and their inspection atworks is not included in this UR. Details of requirements for hull and machinery steel forgingsand castings and for normal and higher strength hull structural steel are given in W7, W8 andW11 respectively. Acceptance of these items is verified through the survey process carriedout at the manufacturer’s works and the issuing of the appropriate certificates.
1.5
In addition to above, for Tankers and Bulk Carriers subject to SOLAS Chapter II-1
Part A-1 Regulation 3-10 (Goal-based ship construction standards for bulk carriers and oiltankers), see also Appendix 2 to this document.
2.

Definitions*2.1

The hull structure is defined as follows:

2.2

a)

hull envelope including all internal and external structures;b)superstructures, deckhouses and casings;c)welded foundations, e.g. main engine seatings;

d)hatch coamings, bulwarks;e)

all penetrations fitted and welded into bulkheads, decks and shell;f)

the fittings of all connections to decks, bulkheads and shell, such as air pipes
and ship side valves – all ILLC 1966, as amended, items;g)welded attachments to shell, decks and primary members, e.g. cranepedestals, bitts and bollards, but only as regards their interaction on the hull
structure.

Reference to documents also includes electronic transmission or storage.

2.3
Definition of survey methods which the surveyor is directly involved in: Patrol, Review,
Witness.
2.3.1 Patrol, the act of checking on an independent and unscheduled basis that theapplicable processes, activities and associated documentation of the shipbuilding functions
identified in Table 1 continue to conform to classification and statutory requirements.
2.3.2 Review, the act of examining documents in order to determine traceability,
identification and to confirm that processes continue to conform to classification and statutory
requirements.
2.3.3 Witness is the attendance at scheduled inspections in accordance with the agreed
Inspection and Test Plans to the extent necessary to check compliance with thesurvey requirements.

*Footnote:

Terminology for hull terms and hull survey terms can be found in Recommendation 82.

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3. Applications
3.1
This UR covers the survey of all new construction of steel ships intended forclassification and for international voyages except for:a)those defined in SOLAS I/3;b)high speed craft as defined in I/1.3.1 of the 2000 High Speed Craft Code;c)

Mobile Offshore Drilling Units as defined in I/1.2.1 of the MODU Code.

3.2
This UR covers all statutory items, relevant to the hull structure and coating, i.e. LoadLine and SOLAS Safety Construction.
3.3
This UR does not cover the manufacture of equipment, fittings and appendages
regardless whether they are made inside or outside of the shipyard, examples being asfollows. Evidence of acceptance shall be provided by accompanying documentation fromclass surveyor at manufacturer and verified at the shipyard:a)hatch covers;b)

doors and ramps integral with the shell and bulkheads;c)rudders and rudder stock;d)

all forgings and castings integral to the hull.

3.4This UR applies to the installation into the ship, welding and testing of:

3.4.1

the items listed in 3.3 above;

3.4.2

equipment forming part of the watertight and weather tight integrity of the ship.

3.5

This UR applies to the hull structures and coating constructed at any of the following:

3.5.1

shipbuilder’s facilities;

3.5.2

sub-contractors at the shipbuilder’s facilities;

3.5.3

sub-contractors at their own facilities or at other remote locations.

4. Qualification and monitoring of personnel
4.1
Exclusive surveyors of the classification society, as defined in PR5, are to confirm
through patrol, review and witness as defined in para. 2.3, that the ships are built using
approved plans in accordance with the relevant rules and statutory requirements. The
surveyors are to be qualified to be able to carry out the tasks and procedures are to be inplace to ensure that their activities are monitored. Details are specified in PR6 and PR7.
5. Survey of the hull structure
5.1
Table 1 provides a list of surveyable items for the hull structure and coating coveredby this UR, including:
5.1.1

description of the shipbuilding functions;Page 3 of 8

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5.1.2

classification and statutory survey requirements;

5.1.3

survey method required for classification;

5.1.4

relevant IACS and statutory requirement references;

5.1.5

documentation to be available for the classification surveyor during construction.

5.1.5.1 The shipbuilder is to provide the classification surveyors access to documentation
required by classification, this includes documentation retained by the shipbuilder or otherthird parties.
5.1.5.2 The list of documents approved or reviewed by the classification society for the
specific new construction are as follows:a)plans and supporting documentsb)examination and testing plansc)

NDE plansd)welding consumable detailse)welding procedure specifications

f)welding plan or detailsg)welder’s qualification recordsh)

NDE operator’s qualification records

5.1.6 Documents to be inserted into the ship construction file. Refer to paragraph 10 for
details.
5.1.7 A list of specific activities which are relevant to the shipbuilding functions. This list is
not exhaustive and can be modified to reflect the construction facilities or specific ship type.
5.2
Evidence is also to be made available, as required, by the shipbuilder, to the surveyor
whilst the construction process proceeds to prove that the material and equipment supplied tothe ship has been built or manufactured under survey relevant to the classification rules andstatutory requirements.
6. Review of the construction facility*
6.1
The society is to familiarize themselves with the yard's production facilities,
management processes, and Safety for consideration in complying with the requirements ofTable 1 prior to any steelwork or construction taking place in the following circumstances:
6.1.1 where the society has none or no recent experience of the construction facilities –typically after a one year lapse - or when significant new infrastructure has been added;
6.1.2 where there has been a significant management or personnel re-structuring having an
impact on the ship construction process;6.1.3 or where the shipbuilder contracts to construct a vessel of a different type or
substantially different in design.
*Footnote:

Reference is made to Appendix 1 “Shipyard review record”, as an example.

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7.

Newbuilding survey planning

7.1
Prior to commencement of surveys for any newbuilding project, the society is to
discuss with the shipbuilder at a kick off meeting the items listed in Table 1. The purpose of
the meeting is to review and agree how the list of specific activities shown in Table 1 is to beaddressed. The meeting is to take into account the shipbuilder’s construction facilities andship type including the list of proposed subcontractors. A record of the meeting is to be made,based upon the contents of the Table 1 – the Table can be used as the record with comments
made into the appropriate column. If the society has nominated a surveyor for a specificnewbuilding project then the surveyor is to attend the kick off meeting.
The builder should agree to undertake ad hoc investigations during construction as may berequested by Class where areas of concern arise and the builder to agree to keep theclassification society advised of the progress of any investigation. Whenever an investigationis undertaken, the builder is to be requested, in principle, to agree to suspend relevant
construction activities if warranted by the severity of the problem.
7.2
The records are to take note of specific published Administration requirements andinterpretations of statutory requirements.
7.3
The shipyard shall be requested to advise of any changes to the activities agreed at
the kick off meeting and these are to be documented in the survey plan. E.g. if the shipbuilder
chooses to use or change sub-contractors, or to incorporate any modifications necessitatedby changes in production or inspection methods, rules and regulations, structuralmodifications, or in the event where increased inspection requirements are deemednecessary as a result of a substantial non-conformance or otherwise.
7.4
Shipbuilding quality standards for the hull structure during new construction are to bereviewed and agreed during the kick-off meeting. Structural fabrication is to be carried out inaccordance with IACS Recommendation 47, “Shipbuilding and Repair Quality Standard”, or a
Recognized Fabrication Standard(RFS) which has been accepted by the Classification
Society prior to the commencement of fabrication/construction. The work is to be carried out
in accordance with the Rules and under survey of the classification society.
A Classification Society may accept an RFS as an alternative to IACS Rec. 47 provided that
7.4.1 or 7.4.2 is complied with as applicable.
7.4.1 Where a RFS is well established and has well documented history (3 or more years
prior to the new vessel contract) of successful application to similar designs as the newvessel and that history is for the same Shipyard as the new vessel. Then the Shipyard is tocreate a summary document referencing the RFS to be used in construction and highlighting
any limitations to usage of the selected RFS. This summary document is to be included withthe “record of kick-off meeting” for the vessel.
The summary document is also to be included in the SCF, (for Tankers and Bulk Carriers
subject to SOLAS Chapter II-1 Part A-1 Regulation 3-10 per App 2, Table A Tier II Item 11),
as applicable.
7.4.2 Where a RFS is new or revised or otherwise not as per 7.4.1 the following steps are to
be carried out:(a) The tolerances and fabrications standards of the RFS are to be compared withthose of Recommendation 47. Any that are less stringent than those of
Recommendation 47 are to be identified.

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Z23(b) The tolerances and fabrication standards of the RFS identified in 7.4.2 (a) are to beassessed to determine the acceptability for use and/or any restrictions for usage for the
subject (or proposed) design. Details of how the acceptability for use and/or restrictions
are to be recorded, and,

Z23
(cont)(c) A summary document including the outcomes of 7.4.2(a) and 7.4.2(b) is to becompiled. This document is to also include a reference to the RFS, details of thetolerance and fabrication standards not analysed as part of 7.4.2(b) and any limitations
to the usage of the RFS.
The summary document is to be included with the “record of the kick-off meeting” of thevessel. The summary document is also to be included in the SCF, (for Tankers and Bulk
Carriers subject to SOLAS Chapter II-1 Part A-1 Regulation 3-10 per App 2, Table A Tier II
Item 11), as applicable.
7.5
The kick-off meeting may be attended by other parties as defined in PR3 (owner,administrations, etc.) subject to agreement by the shipbuilder.
7.6
In the event of series ship production*, the requirement for a kick off meeting inparagraph 7.1 may be waived for the second and subsequent ships provided that no changes
to the specific activities agreed in the kick off meeting for the first ship are introduced. If any
changes are introduced, these are to be agreed in a new dedicated meeting and documented
in a record of such meeting.
*Series Ship Production: vessels in the series subsequent to the first one (prototype), i.e.
sister ships built in the same shipyard.
8. Examination and test plan for newbuilding activities
8.1
The shipbuilder is to provide plans of the items which are intended to be examined
and tested. These plans need not be submitted for approval and examination at the time of
the kick off meeting. They are to include:
8.1.1 proposals for the examination of completed steelwork - generally referred to as theblock plan and are to include details of joining blocks together at the pre-erection and erection
stages or at other relevant stages;
8.1.2 proposals for fit up examinations where necessary;
8.1.3 proposals for testing of the structure (leak and hydrostatic) as well as for all watertightand weathertight closing appliances;
8.1.4

proposals for non-destructive examination;

8.1.5

any other proposals specific to the ship type or to the statutory requirements.

8.2
The plans and any modifications to them are to be submitted to the surveyors in
sufficient time to allow review before the relevant survey activity commences.
8.3
In addition to above, for Tankers and Bulk Carriers subject to SOLAS Chapter II-1
Part A-1 Regulation 3-10 see also Appendix 2 to this Unified Requirement.
9. Proof of the consistency of surveys
9.1
The classification society is to be able to provide evidence, e.g. through records,
check lists, inspection and test records, etc. that its surveyors have complied with thePage 6 of 8

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(cont)

requirements of the newbuilding survey planning and duly participated in the relevant
activities shown in the shipbuilder’s examination and test plans.
9.2
In addition, the classification society is to maintain records of deficiencies found during
the patrolling activities required in Table 1 and described in paragraph 2.3.1.
Records shall include the date when deficiency was found, description of the deficiency andthe date the deficiency was cleared.
10. Ship Construction File
The purposes of this paragraph are applicable to all ships except the Tankers and Bulk
Carriers subject to SOLAS Chapter II-1 Part A-1 Regulation 3-10 for which the paragraph 3 ofAppendix 2 to this Unified Requirement is to be applied.
10.1 The shipbuilder is to deliver documents for the Ship Construction File. In the eventthat items have been provided by another party such as the shipowner and where separate
arrangements have been made for document delivery which excludes the shipbuilder, thatparty has the responsibility.
The Ship Construction File shall be reviewed for content in accordance with the requirementsof para 10.2.
10.2 It is recognised that the purpose of documents held in the Ship Construction File onboard the ship, is to facilitate inspection (survey) and repair and maintenance, and, therefore,
is to include in addition to documents listed in Table 1, but not be limited to:
10.2.1 as-built structural drawings including scantling details, material details, and, asapplicable, wastage allowances, location of butts and seams, cross section details andlocations of all partial and full penetration welds, areas identified for close attention andrudders (Z7.1, Z7.2, Z10.1, Z10.2, Z10.3, Z10.4, Z10.5);
10.2.2 manuals required for classification and statutory requirements, e.g. loading andstability, bow doors and inner doors and side shell doors and stern doors – operations andmaintenance manuals (S8 and S9);10.2.3 ship structure access manual, as applicable;
10.2.4 copies of certificates of forgings and castings welded into the hull (W7 and W8);
10.2.5 details of equipment forming part of the watertight and weather tight integrity of theship;
10.2.5.1 a Cable Transit Seal Systems Register, to be prepared by the shipbuilder forwatertight cable transits. The Register can be in either a hard copy or digitized media. For an
example of a register see Appendix 3 - Recommendatory Sample - Cable Transit Seal
Systems Register. It is to include a marking / identification system, documentation referencing
manufacturer manual(s) for each type of cable transit installed, the Type Approval certificationfor each type of transit system, applicable installation drawings, and a recording of each
installed transit documenting the as built condition after final inspection in the shipyard. This
is to include sections to record any inspection, modification, repair and maintenance.
10.2.6 tank testing plan including details of the test requirements (S14);
10.2.7 corrosion protection specifications (Z8 and Z9);

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10.2.8 details for the in-water survey, if applicable, information for divers, clearances
measurements instructions etc., tank and compartment boundaries;
10.2.9 docking plan and details of all penetrations normally examined at drydocking;10.2.10 Coating Technical File, for ships subject to compliance with the IMO PerformanceStandard for Protective Coatings (PSPC) as a class requirement under the IACS Common
Structural Rules.

Enclosures: A.

Table 1 - Hull Surveyable Items Activities Table

B.

Appendix 1 - Shipyard Review Record

C.

Appendix 2 - Requirements for Tankers and Bulk Carriers subject to
SOLAS Chapter II-1 Part A-1 Regulation 3-10 Goal-based ship
construction standards for bulk carriers and oil tankers

D.

Appendix 3 - Recommendatory Sample - Cable Transit Seal
Systems Register

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

Shipbuilding
function

SurveyRequirements forClassification

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

shipbuilding
quality control
function1

welding

1.1

welding
consumables

1.2

Classification
review approval
approved separately status and patrol,at the manufacturer verify storage,
handling andtreatment inaccordance with
manufacturer's
requirements

welder qualification Qualified welders

review of welder
certification andpatrolUR W17

Recommendation 47

Documentation
available toclassification
surveyor during
construction

Documentation
for shipconstruction fileconsumablespecification andapproval status

not required

shipyards records
with individual's
identification

Page 1 of 14

not required

Specific activities

Classification society
proposals for the project

Identify consumables against
approved list

verify temporary and permanentstorage facilities

e.g. kept dry, covered, whereapplicable heatedverify traceability

e.g. random batch number
checking

verify welder qualification standard,e.g. class or recognised standard
approvalverify welder approved for weld
positionverify validity of qualification certificate

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

1.3

Shipbuilding
function

SurveyRequirements forClassification

Welding All weld joint
configurations,mechanicalproperties (welding positions andmaterials to beprocedures)covered by weld
procedures
approved by theclassificationsociety or byanother IACS
member available

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference
review and patrol

UR W28Documentation
available toclassification
surveyor during
construction
Approved weld
procedure
specification andwelding plan
relevant to the shipproject or process

Documentation
for shipconstruction file
not required

the classification
witness
society witnesses
all new weld
procedure
qualification tests
carried out in the
shipyard wheneverthe classificationsociety is surveying
in the shipyard

1.3a

welding equipment correctly calibrated patrol and review
and maintainedSpecific activities

Classification society
proposals for the project

verify procedures are available atrelevant workstations

verify weld procedures records havebeen approved and cover all weld
processes and positions inaccordance with classification orrecognised standards and areavailable for the surveyors reference

shipbuilders
maintenance andcalibration records

Page 2 of 14

not required

verify condition of machinery andequipment.
verify machines are calibrated byappropriate staff
verify calibration carried out inaccordance with manufacturer's
recommendations
verify calibration in accordance withmaintenance schedule

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

Shipbuilding
function

SurveyRequirements forClassification

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

1.3b

weldingenvironment

satisfactory
environment

patrol

1.3c

weldingsupervision

sufficient number of Review and patrol UR W33,
skilled supervisors
Recommendation 47

1.4

welding- surface
discontinuities

Substantially freefrom significant
indications,satisfactory profileand size

Recommendation 47

visualUR W33,
examination,
Recommesurface detection ndation 47
techniques, review
of documents andpatrol of operator

Documentation
available toclassification
surveyor during
construction

Documentation
for shipconstruction fileSpecific activities

not required

Verify welding areas clean, dry, welllit.
Confirm relevant measures taken forany pre or post heat treatment, drying
of surfaces prior to welding
Confirm shielding gases, fluxes
protected
verify supervision is effective

Shipbuilders andnot required
recognised
standards andRules asapplicable, welding
and NDE plans,
NDE reports,
operatorqualifications

Identify workstations where NDE is
carried out, e.g. panel line butt welds,
castings into hull structure

Classification society
proposals for the project

Verify NDE carried out in accordancewith approved plans where applicable
Verify suitability of NDE methods
Verify operators suitably qualified
particularly where sub-contractors
have been employed
Verify NDE is carried out according to
the acceptable process
Review NDE records

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

Shipbuilding
function

SurveyRequirements forClassification

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

1.5

Welding embedded
discontinuities

NDE is to be carried Radiography and UR W33,
out by qualified
ultrasonic testing, Recomme
operators capable review ofndation 47
of ensuring that
documents andwelds arepatrol of operator,
substantially free
examination of
from significant
films
indications

Documentation
available toclassification
surveyor during
construction
Shipbuilders andrecognised
standards andRules asapplicable, welding
and NDE plans,
NDE reports,
operatorqualifications

Documentation
for shipconstruction file
not required

Specific activities

Classification society
proposals for the project

Identify workstations where NDE is
carried out, e.g. panel line butt welds,
castings into hull structure

Verify NDE carried out in accordancewith approved plans where applicable
Verify suitability of NDE methods
Verify operators suitably qualified
particularly where sub-contractors
have been employed
Verify that records have been
completed and in accordance withrecognised standards, e.g. IQI andsensitivity recorded
Verify that reports and radiographs
have been evaluated correctly by the
shipbuilder. Systematic review ofradiographs carried out by thesurveyor
Verify equipment calibration
satisfactory and in accordance with
manufacturers and recognised
standards requirements
Verify NDE is carried out according to
the acceptable process

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Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

Shipbuilding
function

2

Steel preparationand fit up:
surfacepreparation,
marking andcutting

2.1

SurveyRequirements forClassification

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

Documentation
available toclassification
surveyor during
construction

traceability andacceptability ofmaterial, check ofsteel plates &profiles materials
type, scantling
identification,
testing marks

patrolmaterial
not required
certificates,
shipbuilder'smarking/cutting
production
documents at theworkstage documents retainedat the facility

Recommendation 47

Documentation
for shipconstruction fileSpecific activities

Classification society
proposals for the project

Verify stockyard storage satisfactory

Verify material traceability, e.g.
stamping identification againstmaterial certification, archiving ofrecords
Verify transfer marking after treatment
line
Verify standard of shotblasting andpriming
Verify suitability of primer
Verify that steel grades can be
identified
Verify machinery adjusted to maintainwithin IACS or manufacturers
recommendations.
Verify accuracy of marking and cutting
Verify storage of piece parts.
2.2

straightening

Approval of
patrol and review
straightening
methods/
procedures against
deformation

Recommendation 47

recognised
standards,
approved
procedures

not required

Verify that straightening processes
are approved for the grade and typeof steel, e.g. tmcp, z plate.

Verify that plates and sections arewithin recognised tolerances

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

Shipbuilding
function

SurveyRequirements forClassification

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

2.3

forming

Maintain material
properties.
Acceptance offorming method
against unproper
deformations

patrolRecommendation 47

Documentation
available toclassification
surveyor during
construction
Shipbuilders
procedure for hot
formingDocumentation
for shipconstruction file
not required

Specific activities

Classification society
proposals for the project

Verify that temperature control is
exercised by the operator.

Verify that suitable methods oftemperature control are available
when forming special steels andmaterials
Verify that forming processes are
acceptable2.4

conformity withalignment/fit
up/gap criteria

Check alignment/fit patrol
up/gap againstreference standards

Recommendation 47

Shipbuilders andrecognised
standards andRules asapplicable,

not required

Verify the processes to ensuresatisfactory fit up and alignment at all
workstations

Verify that edge preparations are reinstated where lost during fitting
operations
Verify remedial procedures are inplace to compensate for wide gaps
and alignment deviations

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

2.5

Shipbuilding
function

SurveyRequirements forClassification

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

conformity for
Check alignment/fit witness andreview
critical areas, when up/gap against
approved drawings
defined, withalignment/fit up or
weld configuration

Recommendation 47

Documentation
available toclassification
surveyor during
construction
Shipbuilders andrecognised
standards andRules asapplicable,
approved plan or
standard, builder'srecords

Documentation
for shipconstruction fileSpecific activities

Approved plans ofcritical areas if
applicable

Verify that the information relevant to
the latest approved drawings isavailable at the workstations

Classification society
proposals for the project

Verify the processes to ensuresatisfactory fit up and alignment at all
workstations
Verify that edge preparations are reinstated where lost during fitting
operations
Verify remedial procedures are inplace to compensate for wide gaps
and alignment deviations

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference3

Shipbuilding
function

SurveyRequirements forClassification

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

Steelwork process, compliance withpatrol of thee.g. sub assembly, approved drawings, process andblock, grand and visual examination witness of theof welding andcompleted item
mega block
material, checkassembly, prealignment anderection anderection, closing deformations
platesRecommendation 47

Documentation
Documentation
available tofor shipclassification
construction filesurveyor during
construction
approved plans,
shipbuilders
inspection records,
Shipbuilders andrecognised
standards andRules asapplicable,
construction plan(steelwork subdivision)Specific activities

Classification society
proposals for the project

Verify that the information relevant to
the latest approved drawings isavailable at the workstations

Verify that correct weld sizes havebeen adopted
Verify operation of the welding
processes at the different work stages
is satisfactory
Verify that piece parts are identifiable
Verify that fit ups are withinrecognised tolerances
Verify that correct welding
requirements specified in reference 1of this table have been adopted
Verify processes for closing plates
etc. are acceptable
Confirm that steelwork is inaccordance with the approved plan
4

Remedial work and welding, checkagainstalteration
deformation,alignment

review records
and witness

Recommendation 47

permanent recordof shipyard
surveyable item

Page 8 of 14

Verify that records have been
maintained of significant deviations
from the approved plans, forsituations such as mis cut openings,
re-routing outfit items

IACS Req. 2006/Rev.7 2020/Corr.2 2023

Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

5

Shipbuilding
function

SurveyRequirements forClassification

Tightness testing, Absence of leaks
including leak andhose testing,hydropneumatic
testing

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

Review andUR S14
witness of the test

Reg. II-1/11 of
SOLAS asamended;Documentation
available toclassification
surveyor during
construction

Documentation
for shipconstruction fileapproved tanktesting plan,
shipbuilders
inspection records

approved tanktesting plan

Specific activities

Classification society
proposals for the project

Verify that all deviations brought tothe attention of the classificationsociety by the shipbuilder are
acceptable
Confirm that tank testing is carried out
in accordance with the approved plan

Confirm the methods used to carryout leak testing
Confirm that correct test pressures
maintained for leak, hose and hydroand hydropneumatic testing issatisfactory
Verify that adequate records of thetank testing have been maintained
6

Structural testing structural adequacy Review andUR S14of the design
witness of the test

Reg. II-1/11 of
SOLAS asamended;approved tanktesting plan,
shipbuilders
inspection records

approved tanktesting plan

Confirm that tank testing is carried out
in accordance with the approved plan

Confirm that correct test pressures
maintained for testing is satisfactory
Verify that adequate records of thetank testing have been maintained

7

corrosion
Salt water ballast
Review and report UR Z 8Reg. II-1/3-2 oftanks withon builder's &and Z 9,SOLAS asprotection
boundaries formed manufacturer's
UI SC122, amended;
systems, e.g.
documentation
UR F1
coatings, cathodic by the hullenvelope, and also
protection,
impressed current bulk carrier holdexcept for coating internal surfaces,
system subject to coamings and hatch
covers shall have
PSPC

manufacturer's and corrosion protection Verify that applied coatings arebuilder's
specifications
approved and review records ofspecification
application

Page 9 of 14

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

Shipbuilding
function

SurveyRequirements forClassification
an efficient
protective coating.
Safety aspects ofcathodic systems to
be dealt with

7.1

8

8.1

Application
Antifouling
Systems
Application ofmonitor
implementation ofProtective
the coating
Coatings forinspection
Dedicated
Seawater Ballast requirements
Tanks in all Typesof Ships andDouble-Side Skin
Spaces of Bulk
Carriers subject to
PSPC
Installation,
welding and testingof the following:
hatch covers

tightness andsecuring

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

Review

Documentation
available toclassification
surveyor during
construction

AFS Convention Painting
Specification

Patrolling andReviewUI SC223 Reg. II-1/3-2 of
SOLAS asamended;witness

UR S14 & Reg. 13-14-15
and 16 of ILLC
Rec 14'66

Documentation
for shipconstruction file

Classification society
proposals for the project

Verify that adequate records havebeen maintained and copied to theship construction file

Paint Specificationand Mfg
Declaration
Signed and Verified Coating Technical
Tripartite
File
Agreement

approved tanktesting plan,
shipbuilders
inspection records

Specific activities

Verify that adequate records havebeen maintained and copied to theship construction file
Verify that applied coatings areapproved and review records ofapplication in accordance with
Chapter 7 of Annex to MSC.215(82).

details required,
Confirm leak test of hatch covers
structural drawings

Confirm operation and securing test

Page 10 of 14

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

8.2

Shipbuilding
function

SurveyRequirements forClassification

doors and ramps tightness andintegral with the securingshell andbulkheads

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

Documentation
for shipconstruction filewitness

details required

UR S14Documentation
available toclassification
surveyor during
constructionReg. II-1/18 of approved tanktesting plan,
SOLAS asamended; Reg. shipbuilders
inspection records
12 and 21 of
ILLC '66

Specific activities

Classification society
proposals for the project

Confirm leak test

Confirm operation and securing test
Confirm safety device operation
Ensure correct maintenancelogs/manuals supplied with the ship
construction file
8.3

rudders

fitting

witness

UR S14

approved plan,
shipbuilders
inspection records

details required,
Confirm alignment and mounting andstructural drawings fitting up to the connection to the tiller

Confirm function test
Verify fitting of pintles and all securing
bolts
Verify all fit up records including all
clearances maintained and placed
into ship construction file

Page 11 of 14

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

Shipbuilding
function

SurveyRequirements forClassification

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

8.4

forgings andcastings

compliance withpatrol of theapproved drawings, process andvisual examination witness of theof welding andcompleted item
material, checkalignment anddeformations

UR W7 &
W8

Documentation
available toclassification
surveyor during
construction
approved plans,
shipbuilders
inspection records,
Shipbuilders andrecognised
standards andRules asapplicable,
construction plan(steelwork subdivision)

Documentation
for shipconstruction filecopies ofcertificates offorgings andcastings

Specific activities

Classification society
proposals for the project

Verify casting and forgings againstmaterial certificate

Verify that correct welding and fit up
requirements specified in reference 1,
2.4 and 2.5 of this table have been
adoptedVerify that material certificates areincluded in the ship construction fileappendages

Verify that correct welding and fit up
requirements specified in reference 1,
2.4 and 2.5 of this table have been
adoptedPage 12 of 14

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

8.5

Shipbuilding
function

SurveyRequirements forClassificationequipment forming tightness andthe watertight and securing
weathertightintegrity of theship, e.g.
overboarddischarges, airpipes, ventilators

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
reference

Documentation
available toclassification
surveyor during
constructionReg. II-1/16 and approved tankReg. II-1/16-1 of testing plan,
shipbuilders
SOLAS asamended; Reg. inspection records
17-18-19-20-2223 of ILLC '66

Documentation
for shipconstruction fileSpecific activities

witness

details required

Verify that correct welding and fit up
requirements specified in reference 1,
2.4 and 2.5 of this table have been
adoptedClassification society
proposals for the project

Verify Compliance with Load line
Convention 1966 as amended - i.e. allfittings in accordance with the recordof freeboard assignment
UR P3

Verify air pipes, vents etc closing
device are approved type
Verify material certificates foroverboard discharges whereapplicable
Verify record of freeboard assignment
and all material certificates included in
the ship construction fileFreeboard marks within allowable
witnessand draft marks tolerances and inaccordance with thefreeboard
assignment

UI LL4Reg. 4- 5- 6- 7
and 8 of ILLC
'66

details required

Verify freeboard marks in accordancewith load line assignment

Verify draft marks in accordance withthe agreed tolerances specified by thebuilder unless more onerous flagstate requirements

Page 13 of 14

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Z23, Table 1

Table 1, Hull Surveyable Items Activities Table, Rev.7
Reference

8.6

Shipbuilding
function

SurveyRequirements forClassification

Survey Method IACS
statutory
required forreference requirements
Classification *and relevant
referencePrincipal
dimensions

within allowable
tolerances

review andwitness

SafetyConstruction
certificationno outstanding
imperfections ordefects

watertight cabletransit seal
systemscompliance withpatrol of theapproved drawings, process andvisual examination witness of theof fitting, checkcompleted itemalignment andsecuring

witness

Recommendation 47

Documentation
available toclassification
surveyor during
construction

Documentation
for shipconstruction fileSpecific activities

details required

Verify principal dimensions inaccordance with recognised standard

Reg. I/7 or Reg.
I/10 of SOLAS
as amended, as
appropriate
Reg. II-1/13 and shipbuilder's
Cable Transit Seal
13-1 of SOLAS inspection records, Systems Registeras amended
manufacturer's
specification

Classification society
proposals for the project

Verify dimensions included in ship
construction file
Verify that Administration
requirements have been incorporated
into the hull structure
Verify that correct welding and fit up
requirements, including as specified
in reference 1, 2.4 and 2.5 of thistable have been adopted
Verify watertight cable transit seal
systems are type approved
Verify the format and content of theRegister

Shipbuilder's nameproject
project duration
kick off meeting daterepresenting builder
representing class society* IACS Recommendations are not mandatory requirements.

Page 14 of 14

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Z23, Appendix 1

Appendix 1

Z23
Z23(cont)

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Z23, Appendix 1

Shipyard Review Record

Z23(cont)Name of Shipyard

Date

1. Details of any Management Systems
Obtained approval

Certified by

Expiry Date

ISO 9001
ISO 14001
ISO 45001
Other:

Remarks(scope, etc.)

2. Construction Facilities: (Documents such as a brochure of shipyard can be attached inlieu of completing this section.)
2.1 Building Berth (B) or Dock (D)
B/D

Name

*In case of berth, Depth is not applicable.

Length
(m)

Width
(m)

Depth*(m)

Building
Capacity(GrossTonnage)

Crane(Ton x No.)

Depth
(m)

Berthing
Capacity(GrossTonnage)

Crane(Ton x No.)

2.2 Outfitting Quays
Name

Length(m)

Page 2 of 9

Width
(m)

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Z23, Appendix 1

Z23(cont)

2.3 Main Fabrication and Erection Facilities(1) Marking and cutting of steel plates (including internal members)-

Marking method(Manual, Photo x ___, EPM x ___, NC x ___ others _______)-

NC cutting machine(Gas x ___, Plasma x ___, Laser x ___)

Control procedure of NC (On-line,-

Cutting equipment

other)(Edge planer x ___, Roll-shear x ___)

(2) Marking and cutting of section bar-

Marking method(Manual, NC)- Marking of reference curved line-

Cutting method(Manual, NC)- In case of NC(Manual, NC)(Gas x ___, Plasma x ___)

(3) One-side automatic welding machine (Yes, No)-

Type of welding machine(Flux Backing x ___, Flux and Copper Backing x ___ other _______)-

Existence of special surface plate for plate welding (Yes, No)(4) Fillet welding machine (Gravity, Automatic) Percentage of automatization except gravity: about ___%-

Line Welder(No, Yes: submerged arc x ___ heads, CO2 x ___ heads)-

Small automatic fillet welding machine-

Welding robot(No, Yes: Name: ____________ x ___)

(No, Yes: Portal x ___, Rectangular x ___, Articulated x ___)

(5) Painting equipment-

Plate shot blasting/primer coating machine (No, Yes: Max. Width ___ m, Length ___ m)-Section bar shot blasting/primer coating machine (No, Yes: Max. Length ___ m)-

Special coating factory (No, Yes: ___ m x ___ m x ___ sections)(6) Vertical automatic welding machine (No, Yes: EG x ___, SEG x ___, ES x ___)
EG: Electrogas

SEG: Simplified Electrogas

ES: Electroslag(7) Other main fabrication facilities

Page 3 of 9

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Z23, Appendix 1

Z23(cont)

3. Shipyard Control of Qualified Welders(1) Normal steel
certification

traceability

supervision

maintenanceof qualification

Shipyard workers

confirm system inplace

Yes / NoYes / NoYes / NoYes / No

Subcontracted workers

confirm system inplace

Yes / NoYes / NoYes / NoYes / No

4. Feature of Construction Procedure(1) Subcontract of hull blocks (weight)-

Sub members(No, Yes: Ratio of subcontracted works ___ %, No., of subcontractors ___)-

Blocks(No, Yes: Ratio of subcontracted works ___ %, No., of subcontractors ___)

(2) Method of plate block assembly-

Method fitting and welding longitudinals and transverse webs on jointed panels-

Method welding longitudinals on jointed panels prior to fitting and welding transverse webs-

Method fitting and welding a frame consists of longitudinals and transverse webs on jointed panels-

Method jointing panels with pre-assembled longitudinals by welding prior to fitting and welding transverse
webs-

Other (please specify in (5) below)(3) - pre-erection outfitting carried out
grand block/mega block adopted
Method of erection at building berth/dock-Max. weight of loading block:ton-Construction method in building dock/berth/land construction etc. (1 ship,
entrance)-

Block loading process

1.5 ships: Semi-tandem, dual

(single starting block, multi starting blocks, inserting block: No, Yes)

(4) Final dock (No, Yes: In-house, Other place of the same company, Use other company)(5) Other feature of construction procedure

Page 4 of 9

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Z23, Appendix 1

Z23

5. Quality Control System: (Refer to Quality Manual, if available.)
Item and description(cont)

ResultRemarks(1) Existence of the organization chart including the departmentsof design, purchasing, manufacturing and quality assurance-

Are the function, responsibility and competence of theorganization clear?

(2) Quality control organization-

Existence of quality control organization-

Number of employees in this organization-

Existence of procedures or plans related to tests andinspections_____ persons
including the chief(3) Pre-inspection system of shipyard-

Is pre-inspection carried out prior to Class inspection?

-

Are pre-inspectors assigned? (Check the list.)-

Number of pre-inspectors (related to hull only)-

Are inspection results marked on the object and/or
recorded in the checklist?

_____ persons(4) Records of inspections and tests-

Are records made and kept properly?

-

Does the responsible person verify the records?

-

Can the adoption of necessary corrective actions against
non-conformity happened be checked?

(5) Condition at the time of the surveys in the presence of classsurveyors-

Is the schedule of the surveys changed often?

-

Are pre-inspection, shipyard inspection and repairs
completed beforehand?

-

Are the sufficient preparations for surveys such asscaffoldings, lighting, cleaning made?

Note:
Above-mentioned (3) and (4) include the acceptance inspection of subcontracted items.

Page 5 of 9

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Z23, Appendix 1

Z23

6. Measures for Safety and Health
Item and description(cont)

ResultRemarks(1) Are conditions of scaffolding, nets, safety belt, lighting andventilation good?
(2) Does sufficient attention paid for radiographic examinationand operation of cherry picker?
Note:

7. Control System of Non-Destructive Examination (NDE)
Item and description(1) Number of NDE supervisors in shipyard (including
persons responsible for judging results)

ResultRemarks_____ persons(2) Dependence on subcontracted NDE work-

Number of shipyard employees_____ persons-

Number of sub-contractors_____ persons(3) NDE sub-contractor company’s name and official
technical qualifications

Name ___________(approved by) __________Name ___________(approved by) __________(4) Grade and number of NDE employees with official
technical qualifications in shipyard
Specialized in radiography____ Grade ____ persons

Specialized in ultrasonic____ Grade ____ persons

Specialized in surface detection____ Grade ____ persons(5) If non-destructive examinations are subcontracted, thegrade and number of officially qualified persons
Specialized in radiography____ Grade ____ persons

Specialized in ultrasonic____ Grade ____ persons

Specialized in surface detection____ Grade ____ persons(6) Non-destructive examination equipment (in house)-

Number of radiographic equipment______________-

Number of ultrasonic equipment______________

Note:
Even if all works are subcontracted, it is recommendable to attach the qualified person(s) who can verify theworks.

Page 6 of 9

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Z23, Appendix 1

Z23

8. Quality Control on Production Line
Item and description(cont)

ResultRemarks

8.1 Preventative measures for misuse of materials(1) Job title of supervisor and person in charge of collatingordered steel and received steel, and checking of mill
sheet

Title of supervisor:____________________
Title of person in charge:___________________(2) Are means for checking the material grade in handprescribed for high-grade steels(3) Are regulations prescribed for checking the material
grade for high-tensile steel for low-temperatureapplications?
Are there regulations for inscribing high tensile steel on thesurface of the high tensile steel and special indication forsteel for low temperature applications?
(4) Are procedures for re-using of remaining cut-off mild
steel?
(5) Are there procedures for re-using of remaining cut-off
high-tensile steel?
(6) In the case of (4) and (5) above, can a collation bemade with the mill sheet?
(7) Section of controlling the lists of remaining cut-off steel

Name of section:____________________

Note:- In case of high tensile steel, are means identifying different grades- In the case of (3) and (4) above, are the materials approved by other classes controlled similarly?
8.2 Shot blasting/Primer coating(1) Existence of surface preparation standards(2) Existence of coating thickness control standards-

Existence of thickness measurement records

Note:- The standard is to include the description related traceability after shot blasting and primer coating.
8.3 Marking and cutting (Assembly work)(1) Existence of standards for accuracy and periodical
inspection of tape measures, tapes, stencils, etc.
(2) Existence of standards for accuracy of cut dimensions
and edge preparation(3) Existence of standards for finish of cutting face
(4) What is the frequency and extent of maintenance andinspection carried out for ensuring accuracy of NC cutter
and/or flame planer?

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Z23, Appendix 1

Z23(cont)

Item and description

ResultRemarks(5) In case of NC, are the disks, tapes etc. maintained ingood condition?
(6) What are the measures adopted and guidance given to
make the worker fully conversant with cutting work
standards for maintaining accuracy?
Note:-

In case of (2) and (3) above, check items are to include confirmation of edge preparations free frompiercing hole.
- NC for section bars is also to be in accordance with the above.
8.4 Bending and strain free(1) Existence of standards for maximum heating
temperatures during water cooling and at the time ofbending and distortion removal of steel by quick heating
and cooling(2) Existence of regulations for plate thickness andbending radius for flange processing(3) What are the measures adopted and guidance given to
make the worker fully conversant with maintaining quality
and accuracy during the bending process?
Note:

8.5 Control of welding procedure(1) Are all welding procedures applied to the ships
approved by the Society or other IACS members?
Note:

8.6 Treatment of serious non-conformities(1) Are repair plans submitted to the Society when serious
non-conformities happened?
(2) Were the NDE (RT/UT) plans submitted at appropriate
timing?
(3) Was the extent of tests extended considering theresults of the test?
Note:

8.7 Hydrostatic and watertight tests(1) Is the test plan submitted to the Society?
(2) Are vacuum tests applied to?
(3) Are local air injection tests during sub-assembly works
applied to?

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Z23, Appendix 1

Z23(cont)

Item and description

ResultRemarks(4) If (2) or (3) above is applied to, are the test procedures
approved by the Society?
Note:

Page 9 of 9

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Z23, Appendix 2

Appendix 2

Z23
Z23(cont)

Requirements for Tankers and Bulk Carriers subject to
SOLAS Chapter II-1 Part A-1 Regulation 3-10
Goal-based ship construction standards for bulk carriers and oil tankers

Page 1 of 11

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Z23, Appendix 2

Z23(cont)

1.

Examination and test plan for newbuilding activities

1.1 The shipbuilder is to provide plans of the items which are intended to be examined andtested in accordance with the Society’s Rules in a document known as the Survey Plan,taking into account the ship type and design. This Survey Plan shall be reviewed at the timeof the kick off meeting, and must include:
1.1.1 a set of requirements, including specifying the extent and scope of the construction
survey(s) and identifying areas that need special attention during the survey(s), to ensurecompliance of construction with mandatory ship construction standards including.1.

Types of surveys (visual, non-destructive examination, etc.) depending on
location, materials, welding, casting, coatings, etc.

.2.

Establishment of a construction survey schedule for all assembly stages from the
kick-off meeting, through all major construction phases, up to delivery.

.3.

Inspection/survey plan, including provisions for critical areas identified during
design approval.

.4.

Inspection criteria for acceptance.

.5.

Interaction with shipyard, including notification and documentation of survey
results.

.6.

Correction procedures to remedy construction defects.

.7.

List of items that would require scheduling or formal surveys.

.8.

Determination and documentation of areas that need special attention throughout
ship’s life, including criteria used in making the determination.

1.1.2 a description of the requirements for all types of testing during survey, including test
criteria.
2.

Design Transparency

2.1 For ships subject to compliance with IMO Res. MSC.287(87), IMO Res. MSC.290(87),
IMO Res. MSC.296(87)MSC.454(100) and IMO MSC.1/Circ.1343, readily available
documentation is to include the main goal-based parameters and all relevant design
parameters that may limit the operation of the ship.
3.

Ship Construction File (SCF)

3.1 A Ship Construction File (SCF) with specific information on how the functional
requirements of the Goal-based Ship Construction Standards for Bulk Carriers and Oil
Tankers have been applied in the ship design and construction is to be provided upondelivery of a new ship, and kept on board the ship and/or ashore and updated as appropriate
throughout the ship’s service. The contents of the Ship Construction File are to conform to therequirements below.

Page 2 of 11

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Z23, Appendix 2

Z23(cont)

3.1.1 The following design specific information is to be included in the Ship Construction File
(SCF):.1.

Areas requiring special attention throughout the ship’s life. (including criticalstructural areas).

.2.

All design parameters limiting the operation of a ship.

.3.

Any alternatives to the rules, including structural details and equivalency
calculations.

.4.

"As built" drawings and information which are verified to incorporate all alterations
approved by the recognized organization or flag State during the construction
process including scantling details, material details, location of butts and seams,
cross section details and locations of all partial and full penetration welds.

.5.

Net (renewal) scantlings for all the structural constituent parts, as built scantlingsand voluntary addition thicknesses.

.6.

Minimum hull girder section modulus along the length of the ship which has to be
maintained throughout the ship’s life, including cross section details such as thevalue of the area of the deck zone and bottom zone, the renewal value for theneutral axis zone.

.7.

A listing of materials used for the construction of the hull structure, and provisions
for documenting changes to any of the above during the ship’s service life.

.8.

Copies of certificates of forgings and castings welded into the hull (UR W7 andUR W8).

.9.

Details of equipment forming part of the watertight and weather tight integrity ofthe ship.

.9.1 A Cable Transit Seal Systems Register, to be prepared by the shipbuilder forwatertight cable transits. The Register can be in either a hard copy or digitized
media. For an example of a register see Appendix 3 - Recommendatory Sample Cable Transit Seal Systems Register. It is to include a marking / identification
system, documentation referencing manufacturer manual(s) for each type ofcable transit installed, the Type Approval certification for each type of transit
system, applicable installation drawings, and a recording of each installed transit
documenting the as built condition after final inspection in the shipyard. This is toinclude sections to record any inspection, modification, repair and maintenance.
.10. Tank testing plan including details of the test requirements (UR S14).
.11. Details for the in-water survey, when applicable, information for divers, clearances
measurements instructions etc., tank and compartment boundaries.
.12. Docking plan and details of all penetrations normally examined at drydocking.
.13. Coating Technical File, for ships subject to compliance with the IMO PerformanceStandard for Protective Coatings (PSPC2).
3.1.2 Refer to Table A of this Appendix for details of information to be further included. This
information has to be kept on board the ship and/or ashore and updated as appropriate
Page 3 of 11

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Z23, Appendix 2

Z23(cont)

throughout the ship’s life in order to facilitate safe operation, maintenance, survey, repair andemergency measures.
3.1.3 It is to be noted that parts of the content of the SCF may be subject to various degrees
of restricted access and that such documentation may be appropriately kept ashore.
3.1.4 The SCF has to include the list of documents constituting the SCF and all information
listed in Table A of this Appendix, which is required for a ship’s safe operation, maintenance,
survey, repair and in emergency situations. Details of specific information that is notconsidered to be critical to safety might be included directly or by reference to otherdocuments.
3.1.5 When developing an SCF, all of the columns in Table A of this Appendix have to bereviewed to ensure that all necessary information has been provided.
3.1.6 It may be possible to provide information listed in the annex under more than one TierII1 functional requirement as a single item within the SCF, for example, the Coating TechnicalFile required by the PSPC2 is relevant for both "Coating life" and "Survey during
construction".
3.1.7 The SCF has to remain with the ship and, in addition, be available to its classificationsociety and flag State throughout the ship’s life. Where information not considered necessary
to be on board is stored ashore, procedures to access this information should be specified in
the onboard SCF. The intellectual property provisions within the SCF should be duly compliedwith.
3.1.8 The SCF should be updated throughout the ship’s life at any major event, including, but
not limited to, substantial repair and conversion, or any modification to the ship structure.
3.2 The SCF shall be reviewed3, at the time of new building, in accordance with therequirements of paragraphs 3.1.1 and 3.1.2 and the normal storage location shall be
distinguished.
3.2.1 For the SCF stored on board ship, the surveyor is to verify that the information is placedon board the ship, upon completion of ship construction.
3.2.2 For the SCF stored on shore archive, the surveyor is to verify that the information isstored on shore archive by examining the list of information included on shore archive, uponcompletion of ship construction.
1

Tier II items means the functional requirements included in the International Goal-based Ship Construction
Standards for Bulk Carriers and Oil Tankers (GBS), adopted by IMO Res. MSC 287(87)2Performance standard for protective coatings for dedicated seawater ballast tanks in all types of ships anddouble-side skin spaces of bulk carriers, adopted by IMO Res. MSC 215(82), as amended and Performancestandard for protective coatings for cargo oil tanks of crude oil tankers, adopted by IMO Res. MSC 288(87), as
amended

3“Review” means the examination of the SCF that is carried out by the surveyor, at the end of the newbuilding
process, in order to confirm that:- drawings and documents required under the paragraph 3 of the appendix 2 to the UR Z23, plus
- the possible additional drawings/documents provided by the shipyard, as per the Ship Constructional File
(SCF) list of drawings/documents
are present in the copies of the SCF stored on board and in the ashore archive.
The “review” is not to be intended as an assessment of the drawings/documents in order to verify theircompliances with the applicable Rules/Regulations

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Z23, Appendix 2

Z23(cont)

4.

Determination of number of Surveyor(s)The Classification Society will assign adequate number of suitable qualified surveyor(s) for
new building projects according to the construction progress of each ship to meet appropriate
coverage of the examination and testing activities as agreed in the Survey Plan.

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Z23, Appendix 2
Table A - List of Information to be Included in the Ship Construction File (SCF)

Z23(cont)

Tier II items

Information to be included

Further explanation Example documentsof the content

Normalstoragelocation• assumed design life in years• statement or noteon midship section• SCF-specificon board
ship• midship section planon boardship• SCF-specificon board
ship

on board
ship• applied alternative to Rule

• applied design• SCF-specificmethod alternative toRule and subject
structure(s)• capacity plan• calculating conditions andresults;• allowable loading
pattern

on boardship• assumed loading conditions• maximum allowable • trim and stability booklet
hull girder bending
moment and shear
force

DESIGN
1

Design life2

Environmental
conditions• assumed environmental
conditions

3

Structural strength

3.1 General design • applied Rule (date andrevision)

3.2 Deformationand failuremodes

3.3 Ultimate
strength
3.4 Safety margins• statement
referencing data
source or Rule
(specific rule anddata) or;• in accordance with
Rule (date andrevision)• loading manual

on board
ship

on boardship• operational restrictions due to • maximum allowable • loading instrument instruction on board
manualstructural strengthcargo density orship• operation and maintenance on board
storage factor
manualsship• strength calculation
on shore• strength calculation results• bulky output ofarchivestrength calculation• plan showing highly • areas prone to yielding
stressed areas (e.g. and/or buckling
critical structuralareas) prone toyielding and/or
buckling

on boardship• gross hull girder section
modulus• minimum hull girder section
modulus along the length of theship to be maintained throughout
the ship’s life, including crosssection details such as the valueof the area of the deck zone andPage 6 of 11• general arrangement planon board
ship

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Z23, Appendix 2

Z23 Tier II items

Information to be included(cont)

Further explanation Example documentsof the content

Normalstoragelocation• structural drawings• key construction planson board
ship• rudder and rudder stockplans

on board
ship• structural details

on board
ship• yard planson shorearchive• dangerous area planon board
ship

bottom zone, the renewal value
for the neutral axis zone
• gross scantlings of structural
constituent parts• net scantlings of structural• rudder and sternconstituent parts, as built
frame
scantlings and voluntary addition
thicknesses• structural details oftypical members• hull form
• hull form information • lines plan
indicated in key
construction planson shorearchive• hull form data stored orwithin an onboard
computer necessary
for trim and stability
and longitudinalstrength calculations
equivalent
4

Fatigue life

• applied Rule (date andrevision)on board
ship
on board
ship• applied alternative to Rule

• applied design• SCF-specificmethod alternative toRule and subject
structures• calculating conditions andresults;• assumed loading
conditions and rates

on board
ship• structural details• assumed loading conditions• fatigue life calculation results

5

Residual
strength• applied Rule (date andrevision)

Page 7 of 11• bulky output of• fatigue life calculation
fatigue life calculation

on shorearchive• plan showing areas • areas prone to fatigue(e.g. critical structuralareas) prone tofatigueon boardship• SCF-specificon board
ship

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Z23, Appendix 2

Z23 Tier II items

Information to be included(cont)

6

Further explanation Example documentsof the content

Normalstoragelocation• plans showing areas • SCF-specific(e.g. critical structuralareas) prone toexcessive corrosion • Coating Technical Filerequired by PSPC (Performanceon board
ship

Protection against corrosion

6.1 Coating life
6.2 Corrosion
addition• coated areas and target
coating life and other measuresfor corrosion protection in holds,
cargo and ballast tanks, otherstructure-integrated deep tanks
and void spaces

standard for protective coatings for dedicated seawateron board
ship

ballast tanks in all types of ships and double-side skinspaces of bulk carriers, adopted by IMO Resolution
MSC.215(82), as amended and Performance standard
for protective coatings for cargo oil tanks of crude oiltankers, adopted by IMO Resolution MSC.288(87), as
amended)• specification for coating andother measures for corrosion
protection in holds, cargo andballast tanks, other structureintegrated deep tanks and void
spaces• areas prone to excessive
corrosion

on boardship• gross scantlings of structural
constituent parts• key construction planson board
ship• net scantlings of structural
constituent parts, as built
scantlings and voluntary addition
thicknesses
7

Structural
redundancy• applied Rule (date andrevision)• SCF-specificon board
ship

8

Watertight andweathertightintegrity• applied Rule (date andrevision)• SCF-specificon board
ship

9• key factors for watertight andweathertight integrity

Human element • list of ergonomic design
considerations principles applied to ship
structure design to enhancesafety during operations,inspections and maintenance ofship

10 Designtransparency• details of equipment • structural details of hatch
on board
forming part of thecovers, doors and othership
watertight andclosings integral with the shell
weathertight integrity and bulkheads• SCF-specificon board
ship• applied Rule (date andrevision)• applicable industry standards
for design transparency and IP
protection• intellectual property
provisions

on boardship• reference to part of SCF
information kept ashore• summary, location andaccess procedure for part of
SCF information on shore

on board
ship

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Z23, Appendix 2

Z23 Tier II items

Information to be included

Further explanation Example documentsof the content

Normalstoragelocation

11 Construction
qualityprocedures• applied construction quality
standard• recognized national • SCF-specificor international
construction quality
standard

on boardship

12 Survey during
construction• survey regime applied during• applied Rules (date • SCF-specificconstruction (to include all owner and revision)• tank testing planand class scheduled inspections • copies of certificates
during construction)of forgings andcastings welded into
the hullon board
ship
on board
ship• information on non-destructive
examination• non-destructive testing planon boardship• Coating Technical Filerequired by PSPC

on boardship• SCF-specific• operation and maintenancemanuals (e.g. hatch covers
and doors)

on board
ship
on board
ship(cont)

CONSTRUCTION

IN-SERVICE CONSIDERATIONS
13 Survey andmaintenance• maintenance plans specific tothe structure of the ship where
higher attention is called for• plan showing highly
stressed areas (e.g.
critical structuralareas) prone toyielding, buckling,
fatigue and/or
excessive corrosion• preparations for survey• arrangement and• docking plandetails of all
penetrations normally
examined at drydocking

on boardship• gross hull girder section
modulus• details for drydocking• dangerous area planon boardship• Ship Structure Access
Manualon board
ship• Means of access to otherstructure-integrated deeptanks

on boardship• Coating Technical Filerequired by PSPC

on boardship• gross scantlings of structural
constituent parts• key construction planson board
ship• net scantlings of structural
constituent parts, as built• rudder and rudder stockon board
ship• minimum hull girder section• details for in-water
modulus along the length of the survey
ship to be maintained throughout
the ship’s life, including crosssection details such as the valueof the area of the deck zone andbottom zone, the renewal value
for the neutral axis zone

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Z23, Appendix 2

Z23 Tier II items

Information to be included(cont)

Further explanation Example documentsof the content

Normalstoragelocation

scantlings and voluntary addition
thicknesses• structural details

on board
ship• yard planson shorearchive• hull form information • lines plan
indicated in key
construction planson shorearchive• hull form

14 Structuralaccessibility• means of access to holds,
cargo and ballast tanks andother structure-integrated deep
tanks

or

• plans showing
arrangement anddetails of means ofaccessequivalent

on boardship• Ship Structure Access
Manualon boardship• means of access to otherstructure-integrated deeptanks

on board
ship

RECYCLING CONSIDERATIONS
15 Recycling• identification of all materials• list of materials used • SCF-specificfor the construction ofthat were used in construction
and may need special handling the hull structure
due to environmental and safetyconcerns

on board
ship

Notes:
1"SCF-specific" means documents to be developed especially to meet the requirementsof these GBS guidelines (MSC.1/Circ.1343).

2"Key construction plans" means plans such as midship section, main O.T. and W.T.
transverse bulkheads, construction profiles/plans, shell expansions, forward and aftsections in cargo tank (or hold) region, engine-room construction, forward construction
and stern construction drawings.

3"Yard plans" means a full set of structural drawings, which include scantling informationof all structural members.

4"Hull form" means a graphical or numerical representation of the geometry of the hull.
Examples would include the graphical description provided by a lines plan and thenumerical description provided by the hull form data stored within an onboard computer.

5"Lines plan" means a special drawing which is dedicated to show the entire hull form ofa ship.

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Z23, Appendix 2

Z23

6"Equivalent (to Lines plan)" means a set of information of hull form to be indicated in
key construction plans for SCF purposes. Sufficient information should be included in
the drawings to provide the geometric definition to facilitate the repair of any part of thehull structure.

7"Normal storage location" means a standard location where each SCF information item
should be stored. However, those items listed as being on board in the table above
should be on board as a minimum to ensure that they are transferred with the ship on achange of owner.

8"Shore archive" is to be operated in accordance with applicable international standards.

(cont)End ofDocument

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Appendix 3 - Recommendatory Sample - Cable Transit Seal System Register
Name of Ship: Sample
IMO No: 12345
Place: Hamburg
Date: XX/XX/2017

ID

Location

Column1

Column2

Column4

GIA-07-1047-000-883
GIA-07-1047-000-883
GIA-07-1047-000-883
GIA-07-1047-000-883

TT-MCT-011
TT-MCT-012
TT-MCT-013
TT-MCT-014

F

B

ColumnColumn

C
C
C
C

Type

Opening
numberColumn8

Column9d= 50450x200550x200750x200xxxx

C = Compound (not known brand)
R = Smith Blocks
B = MCT Williams
H = Heavy corrosion
N= Nelson, Terasaki
MB=Mixed brands
MM=Mixed module sizes
NVD=No Visible Defects
CPA=Checkpoints rectangular frames
CPB=Checkpoints round frames

MAINTAINEDMODIFIEDREPAIREDNOTES:

INSPECTEDFRAME

CONDITION(G,F,P)

Type Approved

4
4

Column31

NVD
NVD
NVD
Open, drilled hole not closed

Page 1 of 1

Checked by

Drawing number

Co
umn
7

TRANSIT

BRAND

Inspected side

Transits
Total Openings

Col
umn
10
Col
umn
102
Col
umn
11
Col
umn
12
Col
umn
122
Col
umn
13

Inspected by: Smith

DATE

Column37

Column38

PTO
PTO
PTO
PTO

2/26/2015
2/26/2015
2/26/2015
2/26/2015

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