Common Structural Rules for
Bulk Carriers, January 2006

Background Document
CHAPTER 11 – CONSTRUCTION AND TESTINGNOTE:- 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 11: CONSTRUCTION AND TESTING© IACS - the International Association of Classification Societies and theInternational Association of Classification Societies Limited
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PAGE 3 – CHAPTER 11: CONSTRUCTION AND TESTINGTABLE OF CONTENTS:
SECTION 1 – CONSTRUCTION ........................................................................................................ 4
1.

STRUCTURAL DETAILS............................................................................................................ 4
1.1
1.2
1.3

Cut-outs, plate edges............................................................................................................... 4
Cold forming ........................................................................................................................... 4
Assembly, alignment............................................................................................................... 4

SECTION 2 – WELDING .................................................................................................................... 5
1.

GENERAL.................................................................................................................................... 5
1.1
1.2
1.3
1.4

2.

TYPE OF WELDED CONNECTIONS ......................................................................................... 6
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8

3.

Application.............................................................................................................................. 5
Welding consumables and procedures ................................................................................... 5
Welders and NDE operators ................................................................................................... 6
Documentation to be submitted .............................................................................................. 6
General .................................................................................................................................... 6
Butt welding............................................................................................................................ 6
Tee or cross joints .................................................................................................................... 7
Full penetration welds............................................................................................................. 7
Deep penetration weld ............................................................................................................ 7
Fillet welds .............................................................................................................................. 7
Lap joint welds ........................................................................................................................ 9
Slot welds ................................................................................................................................ 9

CONNECTION DETAILS ........................................................................................................... 9
3.1

Bilge keel connection............................................................................................................... 9

SECTION 3 – TESTING OF COMPARTMENTS ............................................................................. 101.

GENERAL.................................................................................................................................. 10
1.1
1.2

2.

TESTING METHODS ............................................................................................................... 10
2.1
2.2
2.3
2.4
2.5

3.

Definitions ............................................................................................................................. 10
Application............................................................................................................................ 10
Structural testing ................................................................................................................... 10
Leak testing ........................................................................................................................... 11
Hose testing........................................................................................................................... 11
Hydropneumatic testing ....................................................................................................... 11
Other testing methods........................................................................................................... 11

TESTING REQUIREMENTS..................................................................................................... 11
3.1

General .................................................................................................................................. 11

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PAGE 4 – CHAPTER 11: CONSTRUCTION AND TESTINGSECTION 1 – CONSTRUCTION
1. STRUCTURAL DETAILS
1.1

Cut-outs, plate edges

1.1.1
1.1.1.a

Typical precautions related to forming cut-outs and edge preparation are based on
RINA Rules.

1.1.2
1.1.2.a

1.2

The fatigue strength for hatch corner is checked in accordance with Ch 8 Sec.5. The
stress concentration factor depends on the edge treatment as well as hatch cornerconfiguration. Since the stress concentration factor of hatch corners withoutmachine cut is too large to comply with the fatigue requirement, hatch cornerwithout machine cut should be accepted. Furthermore, this practice is inaccordance with the practice of shipyards.

Cold forming

1.2.1
1.2.1.a

1.3

The bending radius for cold forming was specified as the standard radius whenbending corrugated bulkhead in IACS Rec. No. 47. General regulations related tocold forming were specified based on RINA Rules.

Assembly, alignment

1.3.1
1.3.1.a

Typical misalignment standards for weld joints in IACS Rec. No. 47 are described
here. With regard to this matter, considering that the IACS Rec. is not a mandatory
requirement, and reflecting the opinion of the industry that reliable standards suchas the Japanese Shipbuilding Quality Standard should be approved, it was decided
that the classification society could approve standards if it deems them appropriate.

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PAGE 5 – CHAPTER 11: CONSTRUCTION AND TESTINGSECTION 2 – WELDING
1. GENERAL
1.1

Application

1.1.1
1.1.1.a

General regulations related to welding were established referring to the regulationsof various classification societies. Basically, the regulations were in accordance withthe regulations related to welding of various Classification Societies.

1.1.2
1.1.2.a

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

1.1.3
1.1.3.a

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

1.1.4
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

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

1.1.7
1.1.7.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.

Welding consumables and procedures

1.2.1
1.2.1.a

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

1.2.2
1.2.2.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 6 – CHAPTER 11: CONSTRUCTION AND TESTING

1.2.3
1.2.3.a

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

1.3

Welders and NDE operators

1.3.1

Welders

1.3.1.a

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

1.3.2

Automatic welding operators

1.3.2.a

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

1.3.3

NDE operator

1.3.3.a

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

1.4

Documentation to be submitted

1.4.1
1.4.1.a

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

1.4.2
1.4.2.a

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

2. TYPE OF WELDED CONNECTIONS
2.1

General

2.1.1
2.1.1.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.2

Butt welding

2.2.1

General2.2.1.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.2.2

Welding of plates with different thicknesses

2.2.2.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

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PAGE 7 – CHAPTER 11: CONSTRUCTION AND TESTING

2.2.3

Edge preparation, root gap

2.2.3.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.3

Tee or cross joints

2.3.1

General2.3.1.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.4

Full penetration welds

2.4.1

Application

2.4.1.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.4.2
2.4.2.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.4.3
2.4.3.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.4.4
2.4.4.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.4.5
2.4.5.a

2.5

Regulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

Deep penetration weld

2.5.1
2.5.1.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.6

Fillet welds

2.6.1

Kinds and size of fillet welds and their applications

2.6.1.a

The regulation related to leg length of fillet weld was set for plating thickness up to
50 mm referring to the regulations of Chapter 1, Part C of the existing Rules andreferring to existing welding practice. Dimensions of fillet welds are generally
denoted by leg length or throat thickness; here, leg length is indicated because it canbe checked easily on site. The corrosion addition required in Section 2, Chapter 3 isset according to the corrosive environment. The effects of corrosion must also be

COMMON STRUCTURAL RULES FOR BULK CARRIERSCOMMON STRUCTURAL RULES FOR BULK CARRIERS − BACKGROUND DOCUMENT
PAGE 8 – CHAPTER 11: CONSTRUCTION AND TESTING

considered when deciding the dimensions of fillet welds. However, it was decided
to take the full corrosion addition for structural members because leg lengths ofwelds applied to one side of structural members forming boundaries ofcompartments are different from those applied to the other side since welds are
exposed to only one corrosive environment, and such a situation could lead toconfusion at the manufacturing site. Since the corrosion addition of plate member
was 4 mm as a standard, if the corrosion addition for structural member consideredis greater than 4 mm, the weld leg length has to be increased. If the corrosion
addition of structural member is less than 4 mm, only 0.5 mm is to be reduced.

Leg length of fillet weld (mm)During actual operation, considering that the number of locations whereintermittent welds are used is small, new criteria were developed taking F3 ofdouble continuous welds at locations where F3 in Part C of the existing Rules for theSurvey and Construction of Steel Ships is required. (See Fig. 11.1)

20
18
16
14
12
10
8
6
4
2
0

N K F1N K F2IIW
N ew _F1_1
N ew _F2
N ew _F3_1

0

10

20

30

40

50

Thickness of plating (mm)Fig. 11.1

Weld leg length

The steps shown in the figure from the top are F1 and F2 respectively of the existing
rules. Leg lengths based on the guidelines of the International Institute of Welding(IIW) are said to be equivalent to F1, generally used in the existing Rules for theSurvey and Construction of Steel Ships. The weld leg length specified in CSR if
adjusted for corrosion addition is almost the same as the upper limiting line in theexisting Rules for the Survey and Construction of Steel Ships. F3 specified in CSR
was set so that it became equivalent to the lower limiting line of F2 in the existing
Rules for the Survey and Construction of Steel Ships.

2.6.2

Intermittent welds

2.6.2.aThis regulation is based on NK Rules Part C Chapter 1 1.2.

2.6.3

Size of fillet weld for abutting plating with small angle

2.6.3.a

Where the angle between an abutting plate and the connected plate is not 90 degree,
the throat thickness of the fillet weld with larger angle is generally smaller than thatwith smaller angle, in case of the same leg length of fillet weld. In order to ensure
the sufficient strength of fillet weld with larger angle, this requirement is provided.

2.6.4

Deep penetration welds

2.6.4.aThis requirement is based on the current practice.

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PAGE 9 – CHAPTER 11: CONSTRUCTION AND TESTING

2.7

Lap joint welds

2.7.1

General2.7.1.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.7.2

Fillet welds

2.7.2.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.8

Slot welds

2.8.1

General2.8.1.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

2.8.2

Size of fillet welds

2.8.2.aRegulations of this sub-section are based on the rules of various classificationsocieties and on IACS UR S18.

3. CONNECTION DETAILS
3.1

Bilge keel connection

3.1.1
3.1.1.a

The weld details for bilge keel were established referring to the regulation in B2.4,
Sec. 19, Chapter I-1-1 of the GL Rules.

3.1.2
3.1.2.a

The weld details for bilge keel were established referring to the regulation in B2.4,
Sec. 19, Chapter I-1-1 of the GL Rules.

3.1.3
3.1.3.a

The weld details for bilge keel were established referring to the regulation in B2.4,
Sec. 19, Chapter I-1-1 of the GL Rules.

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PAGE 10 – CHAPTER 11: CONSTRUCTION AND TESTINGSECTION 3 – TESTING OF COMPARTMENTS
1. GENERAL
1.1

Definitions

1.1.1

Shop primer

1.1.1.aThis regulation incorporates the regulation of IACS UR S14.

1.1.2

Protective coating

1.1.2.a

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

1.1.3

Structural testing

1.1.3.aThis regulation incorporates the regulation of IACS UR S14.

1.1.4

Hydropneumatic testing

1.1.4.aThis regulation incorporates the regulation of IACS UR S14.

1.1.5

Leak testing

1.1.5.aThis regulation incorporates the regulation of IACS UR S14.

1.1.6

Hose testing

1.1.6.aThis regulation incorporates the regulation of IACS UR S14.

1.2

Application

1.2.1
1.2.1.aThis regulation incorporates the regulation of IACS UR S14.

1.2.2
1.2.2.aThis regulation incorporates the regulation of IACS UR S14.

2. TESTING METHODS
2.1

Structural testing

2.1.1
2.1.1.aThis regulation incorporates the regulation of IACS UR S14.

2.1.2
2.1.2.aThis regulation incorporates the regulation of IACS UR S14.

2.1.3
2.1.3.aThis regulation incorporates the regulation of IACS UR S14.

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PAGE 11 – CHAPTER 11: CONSTRUCTION AND TESTING

2.2

Leak testing

2.2.1
2.2.1.aThis regulation incorporates the regulation of IACS UR S14.

2.2.2
2.2.2.aThis regulation incorporates the regulation of IACS UR S14.

2.2.3
2.2.3.aThis regulation incorporates the regulation of IACS UR S14.

2.2.4
2.2.4.aThis regulation incorporates the regulation of IACS UR S14.

2.2.5
2.2.5.aThis regulation incorporates the regulation of IACS UR S14.

2.2.6
2.2.6.aThis regulation incorporates the regulation of IACS UR S14.

2.2.7
2.2.7.a

2.3

This regulation incorporates the regulation of IACS UR S14.

Hose testing

2.3.1
2.3.1.a

2.4

This regulation incorporates the regulation of IACS UR S14.

Hydropneumatic testing

2.4.1
2.4.1.a

2.5This regulation incorporates the regulation of IACS UR S14.

Other testing methods

2.5.1
2.5.1.aThis regulation incorporates the regulation of IACS UR S14.

3. TESTING REQUIREMENTS
3.1

General

3.1.1
3.1.1.aThis regulation incorporates the regulation of IACS UR S14.

COMMON STRUCTURAL RULES FOR BULK CARRIERS