Common Structural Rules for
Bulk Carriers, January 2006

Background Document
CHAPTER 1 – GENERAL PRINCIPLES

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 1: GENERAL© 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 1: GENERALTABLE OF CONTENTS:
SECTION 1 – APPLICATION ............................................................................................................. 5
1.

GENERAL.................................................................................................................................... 5
1.1
1.2
1.3

2.

RULE APPLICATION ................................................................................................................. 6
2.1
2.2
2.3

3.

Structural requirements........................................................................................................... 5
Limits of application to lifting appliances............................................................................... 5
Limits of application to welding procedures .......................................................................... 6
Ship parts ................................................................................................................................ 6
Rules applicable to various ship parts..................................................................................... 6
Rules applicable to other ship items........................................................................................ 7

CLASS NOTATIONS .................................................................................................................. 7
3.1
3.2
3.3

Additional service features BC-A, BC-B and BC-C ................................................................. 7
Additional class notation GRAB[X]......................................................................................... 7
Class notation CSR .................................................................................................................. 7

SECTION 2 – VERIFICATION OF COMPLIANCE ........................................................................... 81.

GENERAL.................................................................................................................................... 8
1.1
1.2

2.

DOCUMENTATION TO BE SUBMITTED ................................................................................ 8
2.1
2.2

3.

New buildings......................................................................................................................... 8
Ships in service........................................................................................................................ 8
Ships surveyed by the Society during the construction .......................................................... 8
Ships for which the Society acts on behalf of the relevant Administration............................. 9

COMPUTER PROGRAMS .......................................................................................................... 9
3.1
3.2

General .................................................................................................................................... 9
General programs.................................................................................................................... 9

SECTION 3 – FUNCTIONAL REQUIREMENTS ............................................................................. 101.

GENERAL.................................................................................................................................. 10
1.1
1.2
1.3
1.4
1.5
1.6

2.

DEFINITION OF FUNCTIONAL REQUIREMENTS ............................................................... 11
2.1
2.2
2.3
2.4
2.5
2.6

3.

General .................................................................................................................................. 11
Structural strength................................................................................................................. 11
Coating .................................................................................................................................. 11
Corrosion addition ................................................................................................................ 11
Means of access ..................................................................................................................... 11
Construction quality procedures........................................................................................... 12

OTHER REGULATIONS .......................................................................................................... 12
3.1
3.2

4.

Application............................................................................................................................ 10
Design life.............................................................................................................................. 10
Environmental conditions ..................................................................................................... 10
Structural safety .................................................................................................................... 10
Structural accessibility........................................................................................................... 10
Quality of construction.......................................................................................................... 10International regulations ....................................................................................................... 12
National regulations.............................................................................................................. 12

WORKMANSHIP...................................................................................................................... 12
4.1

Requirements to be complied with by the manufacturer...................................................... 12

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PAGE 4 – CHAPTER 1: GENERAL

4.2
5.

Quality control....................................................................................................................... 12

STRUCTURAL DETAILS.......................................................................................................... 12
5.1

Details in manufacturing documents .................................................................................... 12

SECTION 4 – SYMBOLS AND DEFINITIONS................................................................................ 13
1.

PRIMARY SYMBOLS AND UNITS.......................................................................................... 13
1.1 ...................................................................................................................................................... 132.

SYMBOLS.................................................................................................................................. 13
2.1
2.2
2.3
2.4

3.

DEFINITIONS ........................................................................................................................... 13
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
3.13
3.14
3.15
3.16
3.17
3.18
3.19
3.20

4.

Ship’s main data .................................................................................................................... 13
Materials ................................................................................................................................ 13
Loads ..................................................................................................................................... 13
Scantlings............................................................................................................................... 13
Rule length............................................................................................................................. 13
Freeboard length.................................................................................................................... 14
Ends of rule length L and midship ........................................................................................ 14
Moulded breadth................................................................................................................... 14
Depth ..................................................................................................................................... 14
Moulded draught .................................................................................................................. 14
Lightweight ........................................................................................................................... 15
Deadweight ........................................................................................................................... 15
Freeboard deck ...................................................................................................................... 15
Bulkhead deck ....................................................................................................................... 15
Strength deck......................................................................................................................... 15
Superstructure ....................................................................................................................... 15
Forecastle ............................................................................................................................... 15
Raised quarterdeck ................................................................................................................ 15
Deckhouse ............................................................................................................................. 16
Trunk ..................................................................................................................................... 16
Wash bulkhead ...................................................................................................................... 16Standard height of superstructure......................................................................................... 16
Type A and Type B ships....................................................................................................... 16
Positions 1 and 2 .................................................................................................................... 16

REFERENCE CO-ORDINATE SYSTEM ................................................................................... 17
4.1

Reference co-ordinate system ................................................................................................ 17

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PAGE 5 – CHAPTER 1: GENERALSECTION 1 – APPLICATION
1. GENERAL
1.1

Structural requirements

1.1.1
1.1.1.a

These regulations clearly define the application to Common Structural Rules for
Bulk Carriers.

1.1.2
1.1.2.aThe ships to which Part CSR-B applies are clearly defined. As stated in the rules, theregulations apply to typical bulk carriers of length 90 m and greater having adouble bottom structure in the cargo holds, topside tanks and bilge hopper tanks,and side structure of single skin or double skin construction. Bulk carriers to which
Part CSR-B applies and bulk carriers to which Chapter 12 of the SOLAS Convention
applies are different as was understood when the original draft of the CSR was
prepared because priority was given to developing common structural rules first,
and so, only typical bulk carriers were considered. These regulations also apply tobulk carriers with topside tanks and bilge hopper tanks in a part of the cargo area,with no topside tanks and bilge hopper tanks in the remaining part of the cargo area.

1.1.3
1.1.3.a

From ships that comply with IACS UR S11, ships of length L<500 m were corrected
to realistic values (L<350 m).

1.1.4
1.1.4.a

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

1.1.5
1.1.5.a

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

1.1.6
1.1.6.a

1.2

It is only required that the scantling draft is required to be greater than the draft
corresponding to the specified freeboard.

Limits of application to lifting appliances

1.2.1
1.2.1.aThis regulation is based on the regulation in 1.2, Sec. 1, Chapter 1, Part B of the
RINA Rules.

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PAGE 6 – CHAPTER 1: GENERAL

1.2.2
1.2.2.aThis regulation is based on the regulation in 1.2, Sec. 1, Chapter 1, Part B of the
RINA Rules.

1.2.3
1.2.3.a

1.3

This regulation is based on the regulation in 1.2, Sec. 1, Chapter 1, Part B of the
RINA Rules.

Limits of application to welding procedures

1.3.1
1.3.1.aThis regulation is based on the regulation in 1.1, Sec. 1, Chapter 12, Part B of the
RINA Rules.

2. RULE APPLICATION
2.1

Ship parts

2.1.1

General2.1.1.a

The regulations from 2.1 to 2.3 are based on the regulations of 2.1 to 2.3, Sec. 1,
Chapter 1, Part B, of the RINA Rules. The structure in the forward part is defined as
structure forward of the collision bulkhead in principle, but the scope of
applicability of the structural regulations for slamming of the forward bottom andbow flare extends also to the structural parts aft of the collision bulkhead. To avoid
duplication and for convenience, the regulations are included in those for theforward part.

2.1.2

Fore part2.1.2.a

The regulations are based on the regulations of 2.1 to 2.3, Sec. 1, Chapter 1, Part B, of
the RINA Rules.

2.1.3

Central part2.1.3.a

The regulations are based on the regulations of 2.1 to 2.3, Sec. 1, Chapter 1, Part B, of
the RINA Rules.

2.1.4

Aft part

2.1.4.a

The regulations are based on the regulations of 2.1 to 2.3, Sec. 1, Chapter 1, Part B, of
the RINA Rules.

2.2

Rules applicable to various ship parts

2.2.1
2.2.1.a

The regulations are based on the regulations of 2.1 to 2.3, Sec. 1, Chapter 1, Part B, of
the RINA Rules.

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PAGE 7 – CHAPTER 1: GENERAL

2.3

Rules applicable to other ship items

2.3.1
2.3.1.a

The regulations are based on the regulations of 2.1 to 2.3, Sec. 1, Chapter 1, Part B, of
the RINA Rules.

3. CLASS NOTATIONS
3.1

Additional service features BC-A, BC-B and BC-C

3.1.1
3.1.1.aThis regulation incorporates the regulation of IACS UR S25, 3.

3.1.2
3.1.2.aThis regulation incorporates the regulation of IACS UR S25, 3.

3.1.3
3.1.3.aThis regulation incorporates the regulation of IACS UR S25, 3.

3.2

Additional class notation GRAB[X]3.2.1

Application

3.2.1.aThis regulation was set with the aim of achieving consistency with 6.5.1, Chapter 12of the SOLAS Convention. The minimum mass of the grab is taken as 20 tons. The
strength requirement for impact load of grab specified in Chapter 12 of the Rules
must be satisfied. The minimum mass of grab of 20 tons is based on the results ofstudies on the mass of grabs used for loading/unloading cargoes (ore, coal, chips,etc.) in ports.

3.3

Class notation CSR

3.3.1

Application

3.3.1.aThis regulation has been specified so as to clearly define the class notation.

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PAGE 8 – CHAPTER 1: GENERALSECTION 2 – VERIFICATION OF COMPLIANCE
1. GENERAL
1.1

New buildings

1.1.1
1.1.1.aThis regulation is based on the regulations of 2, Section 1, Chapter 2, Part A of the
RINA Rules.

1.1.2
1.1.2.aThis regulation is based on the regulations of 2, Section 1, Chapter 2, Part A of the
RINA Rules.

1.1.3
1.1.3.aThis regulation is based on the regulations of 2, Section 1, Chapter 2, Part A of the
RINA Rules.

1.1.4
1.1.4.a

1.2

This regulation is based on the regulations of 2, Section 1, Chapter 2, Part A of the
RINA Rules.

Ships in service

1.2.1
1.2.1.aThis regulation is based on the regulations of 2, Section 1, Chapter 2, Part A of the
RINA Rules.

2. DOCUMENTATION TO BE SUBMITTED
2.1

Ships surveyed by the Society during the construction

2.1.1

Plans and documents to be submitted for approval

2.1.1.a

These regulations are based on the regulations in 1, Section 3, Chapter 1, Part B of
the RINA Rules. The information to be included and shown in Table 1 of the rules isessential when examining the drawings. The information need not necessarily beshown in the drawings; it may be stated in the calculations related to the relevantdrawings.

2.1.2
2.1.2.a

These regulations are based on the regulations in 1, Section 3, Chapter 1, Part B of
the RINA Rules.

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PAGE 9 – CHAPTER 1: GENERAL

2.2

Ships for which the Society acts on behalf of the relevant Administration

2.2.1

Plans and documents to be submitted for approval

2.2.1.a

These regulations are based on the regulations in 1, Section 3, Chapter 1, Part B of
the RINA Rules.

3. COMPUTER PROGRAMS
3.1

General

3.1.1
3.1.1.a

3.2

This regulation is the same as the regulations given in the RINA Rules.
Classification societies verify the accuracy of computer program used, but do not
approve them as general-purpose programs.

General programs

3.2.1
3.2.1.aThis regulation is the same as the regulations given in the RINA Rules.

3.2.2
3.2.2.aThis regulation is the same as the regulations given in the RINA Rules.

3.2.3
3.2.3.aThis regulation is the same as the regulations given in the RINA Rules.

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PAGE 10 – CHAPTER 1: GENERALSECTION 3 – FUNCTIONAL REQUIREMENTS
1. GENERAL
1.1

Application

1.1.1
1.1.1.a

1.2

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

Design life

1.2.1
1.2.1.a

1.3

This regulation is based on the functional requirements specified in the Tier II.1 andII.9 of "Goal Based Standards" discussed at the IMO and approved tentatively at the
81st meeting of the Maritime Safety Committee in May 2006.

Environmental conditions

1.3.1
1.3.1.a

1.4

This regulation corresponds to the functional requirements specified in the Tier II.2
of "Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

Structural safety

1.4.1
1.4.1.a

1.5This regulation is based on the functional requirements specified in the Tier I of
"Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

Structural accessibility

1.5.1
1.5.1.a

1.6This regulation corresponds to the functional requirements specified in the Tier II.14
of "Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

Quality of construction

1.6.1
1.6.1.aThis regulation corresponds to the functional requirements specified in the Tier II.11
of "Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

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PAGE 11 – CHAPTER 1: GENERAL

2. DEFINITION OF FUNCTIONAL REQUIREMENTS
2.1

General

2.1.1
2.1.1.a2.2

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

Structural strength

2.2.1
2.2.1.aThis regulation corresponds to the functional requirements specified in the Tier II.3
of "Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

2.2.2
2.2.2.aThis regulation corresponds to the functional requirements specified in the Tier II.5
of "Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

2.2.3
2.2.3.a

2.3

This regulation corresponds to the functional requirements specified in the Tier II.4
of "Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

Coating

2.3.1
2.3.1.a

2.4

This regulation corresponds to the functional requirements specified in the Tier
II.6.1 of "Goal Based Standards" discussed at the IMO and approved tentatively at
the 81st meeting of the Maritime Safety Committee in May 2006.

Corrosion addition

2.4.1
2.4.1.a

2.5This regulation corresponds to the functional requirements specified in the Tier
II.6.2 of "Goal Based Standards" discussed at the IMO and approved tentatively at
the 81st meeting of the Maritime Safety Committee in May 2006.

Means of access

2.5.1
2.5.1.aThis regulation corresponds to the functional requirements specified in the Tier II.14
of "Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006 and SOLAS, CHII-1, Reg. 36.

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PAGE 12 – CHAPTER 1: GENERAL

2.6

Construction quality procedures

2.6.1
2.6.1.aThis regulation corresponds to the functional requirements specified in the Tier II of"Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

3. OTHER REGULATIONS
3.1

International regulations

3.1.1
3.1.1.a3.2

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

National regulations

3.2.1
3.2.1.a

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

4. WORKMANSHIP
4.1

Requirements to be complied with by the manufacturer

4.1.1
4.1.1.a

4.2

This regulation corresponds to the functional requirements specified in the Tier II of"Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

Quality control

4.2.1
4.2.1.aThis regulation is based on the functional requirements specified in the Tier II.11 of"Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

5. STRUCTURAL DETAILS
5.1

Details in manufacturing documents

5.1.1
5.1.1.aThis regulation is based on the functional requirements specified in the Tier II.11 of"Goal Based Standards" discussed at the IMO and approved tentatively at the 81st
meeting of the Maritime Safety Committee in May 2006.

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PAGE 13 – CHAPTER 1: GENERALSECTION 4 – SYMBOLS AND DEFINITIONS
1. PRIMARY SYMBOLS AND UNITS
1.1
1.1.1
1.1.1.aDefinitions of general symbols and units used in the Rules are specified.

2. SYMBOLS
2.1

Ship’s main data

2.1.1
2.1.1.a

2.2

Definitions of ship main data are specified.

Materials

2.2.1
2.2.1.a

2.3

Definitions of symbols used for the characteristics of materials are specified.

Loads

2.3.1
2.3.1.aDefinitions of symbols used for loads and moments are specified.

2.4

Scantlings

2.4.1

Hull girder scantlings

2.4.1.aDefinitions of symbols used for the hull girder scantlings are specified.

2.4.2

Local scantlings

2.4.2.aDefinitions of symbols used for the local scantlings are specified.

3. DEFINITIONS
3.1

Rule length

3.1.1
3.1.1.aThe definition is in accordance with IACS UR S2.

3.1.2
3.1.2.a

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

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PAGE 14 – CHAPTER 1: GENERAL

3.1.3
3.1.3.a3.2

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

Freeboard length

3.2.1
3.2.1.aThe definition is in accordance with International Convention of Load Line.

3.2.2
3.2.2.aThe definition is in accordance with International Convention of Load Line.

3.3

Ends of rule length L and midship

3.3.1

Fore end

3.3.1.a

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

3.3.2

Midship

3.3.2.a

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

3.3.3

Midship part3.3.3.a

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

3.4

Moulded breadth

3.4.1
3.4.1.a

3.5

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

Depth

3.5.1
3.5.1.a3.6

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

Moulded draught

3.6.1
3.6.1.a

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

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PAGE 15 – CHAPTER 1: GENERAL

3.7

Lightweight

3.7.1
3.7.1.a

3.8

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

Deadweight

3.8.1
3.8.1.a

3.9

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

Freeboard deck

3.9.1
3.9.1.aThe definition is in accordance with International Convention of Load Line.

3.10 Bulkhead deck
3.10.1
3.10.1.a The definition is in accordance with International Convention for the Safety of Lifeat Sea.

3.11 Strength deck
3.11.1
3.11.1.a It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

3.12 Superstructure
3.12.1 General
3.12.1.a The definition is in accordance with International Convention of Load Line.

3.12.2 Enclosed and open superstructure
3.12.2.a It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

3.13 Forecastle
3.13.1
3.13.1.a The definition is in accordance with International Convention of Load Line.

3.14 Raised quarterdeck
3.14.1
3.14.1.a The definition is in accordance with International Convention of Load Line.

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PAGE 16 – CHAPTER 1: GENERAL

3.15 Deckhouse
3.15.1
3.15.1.a It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

3.16 Trunk
3.16.1
3.16.1.a It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

3.17 Wash bulkhead
3.17.1
3.17.1.a It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

3.18 Standard height of superstructure
3.18.1
3.18.1.a The definition is in accordance with International Convention of Load Line.

3.19 Type A and Type B ships
3.19.1 Type A ship
3.19.1.a The definition is in accordance with International Convention of Load Line.

3.19.2 Type B ship
3.19.2.a The definition is in accordance with International Convention of Load Line.

3.19.3 Type B-60 ship
3.19.3.a The definition is in accordance with International Convention of Load Line.

3.19.4 Type B-100 ship
3.19.4.a The definition is in accordance with International Convention of Load Line.

3.20 Positions 1 and 2
3.20.1 Position 1
3.20.1.a The definition is in accordance with International Convention of Load Line.

3.20.2 Position 2
3.20.2.a The definition is in accordance with International Convention of Load Line.

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PAGE 17 – CHAPTER 1: GENERAL

4. REFERENCE CO-ORDINATE SYSTEM
4.1

Reference co-ordinate system

4.1.1
4.1.1.a

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

4.1.2
4.1.2.a

It is considered that for this topic, no information in addition to that shown in theRules is necessary to explain the background.

COMMON STRUCTURAL RULES FOR BULK CARRIERS