Common Structural Rules for
Bulk Carriers, January 2006

Background Document
CHAPTER 13 – SHIPS IN OPERATION, RENEWALCRITERIA

NOTE:- This TB is published to improve the transparency of CSRs and increase theunderstanding of CSRs in the industry.
- The content of the TB is not to be considered as requirements.
- This TB cannot be used to avoid any requirements in CSRs, and in cases
where this TB deviates from the Rules, the Rules have precedence.
- This TB provides the background for the first version (January 2006) of theCSRs, and is not subject to maintenance.COMMON STRUCTURAL RULES FOR BULK CARRIERS − BACKGROUND DOCUMENT
PAGE 2 – CHAPTER 13: SHIPS IN OPERATION, RENEWAL CRITERIA© IACS - the International Association of Classification Societies and theInternational Association of Classification Societies Limited
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COMMON STRUCTURAL RULES FOR BULK CARRIERSCOMMON STRUCTURAL RULES FOR BULK CARRIERS − BACKGROUND DOCUMENT
PAGE 3 – CHAPTER 13: SHIPS IN OPERATION, RENEWAL CRITERIATABLE OF CONTENTS:SECTION 1 – MAINTENANCE OF CLASS........................................................................................ 4
1.

GENERAL.................................................................................................................................... 41.1
1.2

Application.............................................................................................................................. 4Definitions ............................................................................................................................... 4

SECTION 2 – THICKNESS MEASUREMENTS AND ACCEPTANCE CRITERIA........................... 51.

APPLICATION ............................................................................................................................ 5
1.1General .................................................................................................................................... 5

2. RULE REQUIREMENTS FOR THE EXTENT OF MEASUREMENTS AND THE
DETERMINATION OF LOCATIONS................................................................................................ 52.12.2
2.3
3.

General .................................................................................................................................... 5Class renewal survey............................................................................................................... 5
Number and locations of measurements................................................................................. 5

ACCEPTANCE CRITERIA .......................................................................................................... 63.1
3.2
3.3Definitions ............................................................................................................................... 6Local strength criteria.............................................................................................................. 6Global strength criteria............................................................................................................ 6

COMMON STRUCTURAL RULES FOR BULK CARRIERSCOMMON STRUCTURAL RULES FOR BULK CARRIERS − BACKGROUND DOCUMENT
PAGE 4 – CHAPTER 13: SHIPS IN OPERATION, RENEWAL CRITERIASECTION 1 – MAINTENANCE OF CLASS
1. GENERAL
1.1

Application

1.1.1
1.1.1.aSince regulations related to survey requirements for the maintenance of class ofbulk carriers exist in the rules of every classification society, based on IACS UR Z
10.2 and UR Z 10.5, general regulations are specified to refer to them.

1.1.2
1.1.2.aSince regulations related to survey requirements for the maintenance of class ofbulk carriers exist in the rules of every classification society, based on IACS UR Z
10.2 and UR Z 10.5, general regulations are specified to refer to them.

1.1.3
1.1.3.aSince regulations related to survey requirements for the maintenance of class ofbulk carriers exist in the rules of every classification society, based on IACS UR Z
10.2 and UR Z 10.5, general regulations are specified to refer to them.

1.2Definitions

1.2.1

Local corrosion

1.2.1.aCorrosion of very local aspect is defined.

1.2.2

Substantial corrosion

1.2.2.aThis definition is based on IACS UR Z 10.2 and UR Z 10.5.

COMMON STRUCTURAL RULES FOR BULK CARRIERSCOMMON STRUCTURAL RULES FOR BULK CARRIERS − BACKGROUND DOCUMENT
PAGE 5 – CHAPTER 13: SHIPS IN OPERATION, RENEWAL CRITERIASECTION 2 – THICKNESS MEASUREMENTS AND
ACCEPTANCE CRITERIA
1. APPLICATION
1.1

General

1.1.1
1.1.1.a

The general layout of the Section is detailed.

2. RULE REQUIREMENTS FOR THE EXTENT OF MEASUREMENTS AND THE
DETERMINATION OF LOCATIONS
2.1

General

2.1.1
2.1.1.a

2.2

The general references to rule requirements for thickness measurements, based on
IACS UR Z 7 (outside the cargo length area), UR Z 10.2 (within the cargo lengtharea) and UR Z 10.5 (within the cargo length area) are given.

Class renewal survey

2.2.1
2.2.1.a

What thickness measurements consist of is explained.

2.2.2
2.2.2.a

References are made to IACS UR Z 7, UR Z 10.2 and UR Z 10.5 for thedetermination of close-up surveys and relevant thickness measurements as well as
the areas considered as suspect areas.

2.3

Number and locations of measurements

2.3.1

Number of measurements

2.3.1.a

It is clarified that the locations of the points to be measured are given for the mostimportant items of the structure.

2.3.2

Locations of measurements

2.3.2.a

These requirements are based on IACS UR Z 10.2, UR Z 10.5 and BV Rules Part A,Ch 2, App 3.

COMMON STRUCTURAL RULES FOR BULK CARRIERSCOMMON STRUCTURAL RULES FOR BULK CARRIERS − BACKGROUND DOCUMENT
PAGE 6 – CHAPTER 13: SHIPS IN OPERATION, RENEWAL CRITERIA

3. ACCEPTANCE CRITERIA
3.1

Definitions

3.1.1

Deck zone

3.1.1.aThe structural items to be included in the deck zone are defined.

3.1.2

Bottom zone

3.1.2.aThe structural items to be included in bottom zone are defined.

3.1.3

Neutral axis zone

3.1.3.aThe structural items to be included in the neutral axis zone are defined.

3.2

Local strength criteria

3.2.1

Items for the local strength criteria

3.2.1.aThe structural items to be considered for the local strength criteria are defined.

3.2.2

Renewal thickness for corrosion other than local corrosion

3.2.2.a

The criteria specifies that steel renewal is required when the gauged thickness is lessthan the renewal thickness, as per standard principle among IACS members.

3.2.3

Renewal thickness for local corrosion

3.2.3.a

The criteria for renewal thickness in case of local corrosion is based on UR Z 10.2
and UR Z 10.5

3.3

Global strength criteria

3.3.1

Items for the global strength criteria

3.3.1.a

Reference is made to [3.1] for the list of items of the deck zone, bottom zone andneutral axis zone to be considered for the global strength criteria.

3.3.2

Renewal thickness

3.3.2.aThe specified global strength criteria is based on current IACS Members rule
requirements.

COMMON STRUCTURAL RULES FOR BULK CARRIERS