SVR_Part_5A&B_e-July17.pdf

P a r t 5 A & 5 B : S p e c i f i c V e s s e l T y p e s ( C h a p t e r s 1 a n d 3 )

RULES FOR BUILDING AND CLASSING

STEEL VESSELS

PART 5A & 5B

SPECIFIC VESSEL TYPES

Common Structural Rules for Bulk Carriers and Oil Tankers

(These Rules are applicable for those vessels having construction contracts signed 1 July 2017 to 30 June 2018)

American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862

2017 American Bureau of Shipping. All rights reserved.

ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA

(Copyright in these Rules is also owned by the other IACS members as at 1st July 2012.

Copyright 1st July IACS 2012)

Foreword These Rules published on 1 July 2017 consist of:

Common Structural Rules for Bulk Carriers and Oil Tankers – 1 January 2017 Corrigenda No. 1 (to 1 January 2017 version) – effective 1 July 2017

In association with the harmonization of the Common Structural Rules (CSR) for Bulk Carriers and Oil Tankers, the three Sub-parts, 5A, 5B, and 5C, of Part 5 of the Rules for Building and Classing Steel Vessels, 2017 are as follows:

Contents Part 5A: General Hull Requirements (IACS CSR Part 1)

Part 5B: Ship Types (IACS CSR Part 2)

Part 5C: This Part is divided into two separate booklets as follows:

Chapters 1 to 6: Tankers and Bulk Carriers not covered by Part 5A and Part 5B and Container Carriers

Chapters 7 to 13: Passenger Vessels, Liquefied Gas Carriers, Chemical Carriers, Vessels Intended to Carry Vehicles, Water Carriers, Membrane Tank LNG Carriers, and Vessels Using Gases or other Low- Flashpoint Fuels.

Application – Oil Tankers The structural requirements in Part 5A, Pt 1 and Part 5B, Pt 2, Ch 2 of the Rules are applicable for double hull oil tankers of 150 m in length and upward, with structural arrangements as specified in Part 5A, Pt 1, Ch 1, Sec 1, [1.3].

For oil tankers with structural arrangements not covered by Part 5A, Pt 1 and Part 5B, Pt 2, Ch 2, the requirements in Part 5C, Chapters 1 or 2, are to be complied with.

Application – Bulk Carriers The structural requirements in Part 5A, Pt 1 and Part 5B, Pt 2, Ch 1 of the Rules are applicable for single side skin and double side skin bulk carriers of 90m in length and upward, with structural arrangements as specified in Part 5A, Pt 1, Ch 1, Sec 1, [1.2].

For vessels intended to carry ore or bulk cargoes, other than the single side skin or double side skin bulk carriers of 90 m in length and upward with structural arrangements as specified in Part 5A, Pt 1 and Part 5B, Pt 2, Ch 1, the requirements in Part 5C, Chapters 3 or 4 are to be complied with.

Application – ABS Construction Monitoring Program These compulsory requirements for CSR notation are specified in Part 5C, Appendix 2.

Application – Onboard Systems for Oil Tankers and Bulk Carriers The onboard systems for all tankers are to comply with the requirements of Part 5C, Chapter 1, Section 7, and for all bulk carriers are to comply with the requirements of Part 5C, Chapter 3, Section 7 of the Rules.

Application – References Other Parts of the ABS Rules that are referenced within Part 5A, 5B, or 5C are also to be applied.

ii 01 JAN 2017 COMMON STRUCTURAL RULES

The following flow chart indicates the application of the Rules and typical Class Notations for tanker and bulk carrier vessels, of which arrangements and scantlings are in full compliance with the Rules:

Vessels Intended to Carry Oil in Bulk Vessels Intended to Carry Ore or Bulk Cargoes

L ≥ 150 m?

Arrangement and layout comply with

Part 5A, Pt 1, Ch 1, Sec 1, [1.3] and Part 5A, Pt 1, Ch 1, Sec 1, Figure 3?

Part 5A, Pt 1 and Part 5B, Pt 1, Ch 2:

Common Structural Rules and Part 5C, Appendix 2

Part 5C, Chapter 1, Section 7:

ABS Steel Vessel Rules

À A1 Oil Carrier, CSR, AB-CM plus appropriate notations for oil carriers

Part 5C, Chapter 1, Appendix 1 to Part 5C

ABS Steel Vessel Rules (L ≥ 150 m)

À A1 Oil Carrier, SH, SHCM plus appropriate notations for oil carriers

Part 5C, Chapter 2 ABS Steel Vessel Rules

(L < 150 m)

À A1 Oil Carrier plus appropriate notations for oil carriers

L ≥ 90 m?

Arrangement and layout comply with

Part 5A, Pt 1, Ch 1, Sec 1, [1.2] and Part 5A, Pt 1, Ch 1, Sec 1, Figures 1 & 2?

Part 5A, Pt 1 and Part 5B, Pt 1, Ch 1:

Common Structural Rules and Part 5C, Appendix 2

Part 5C, Chapter 3, Section 7:

ABS Steel Vessel Rules

Part 5C, Chapter 3, Appendix 1 to Part 5C

ABS Steel Vessel Rules (L ≥ 150 m)

Part 5C, Chapter 4 ABS Steel Vessel Rules

(L < 150 m)

À A1 Bulk Carrier, CSR, AB-CM plus appropriate notations for bulk carriers

À A1 Bulk Carrier, SH, SHCM plus appropriate notations for bulk carriers

À A1 Bulk Carrier plus appropriate notations for bulk carriers

Yes

Yes

Yes

Yes

No No

Or

No No

COMMON STRUCTURAL RULES 01 JAN 2017 iii

Full Revision History for CSR BC & OT

Summary of changes from the 01 JAN 2014 Rules

Amendment Type / No. Adoption Date Rule Version Date Effective Date

1 Rule Change Notice 1 22 DEC 2014 01 JAN 2014 01 JUL 2015

2 Urgent Rule Change Notice 1 22 DEC 2014 01 JAN 2014 01 JUL 2015

3 Corrigenda 1 20 JAN 2016 01 JAN 2015 01 JUL 2015

4 Urgent Rule Change Notice 1 (2016) 09 DEC 2016 01 JAN 2015 01 JUL 2017

5 Corrigenda 1 (2017) 26 APRIL 2017 01 JAN 2017 01 JUL 2017

Common Structural Rules for Bulk Carriers and Oil Tankers

Corrigenda 1 to 01 January 2017 version

Note: This Corrigenda enters into force on 1st July 2017.

Copyright in these Common Structural Rules is owned by each IACS Member as at 1st January 2014.

Copyright © IACS 2014.

The IACS members, their affiliates and subsidiaries and their respective officers, employees or agents (on behalf of whom this disclaimer is given) are, individually and collectively, referred to in this disclaimer as the "IACS Members". The IACS Members assume no responsibility and shall not be liable whether in contract or in tort (including negligence) or otherwise to any person for any liability, or any direct, indirect or consequential loss, damage or expense caused by or arising from the use and/or availability of the information expressly or impliedly given in this document, howsoever provided, including for any inaccuracy or omission in it. For the avoidance of any doubt, this document and the material contained in it are provided as information only and not as advice to be relied upon by any person.

Any dispute concerning the provision of this document or the information contained in it is subject to the exclusive jurisdiction of the English courts and will be governed by English law.

COMMON STRUCTURAL RULES CORRIGENDA 1

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 2 OF 30

CONTENTS

PART 1 GENERAL HULL REQUIREMENTS

CHAPTER 1 RULE GENERAL PRINCIPLES

SECTION 2 RULE PRINCIPLES

SECTION 5 LOADING MANUAL AND LOADING INSTRUMENTS

CHAPTER 3 STRUCTURAL DESIGN PRINCIPLES

SECTION 6 STRUCTURAL DETAIL PRINCIPLES

CHAPTER 4 LOADS

SECTION 4 HULL GIRDER LOADS

SECTION 6 INTERNAL LOADS

SECTION 8 LOADING CONDITIONS

CHAPTER 5 HULL GIRDER STRENGTH

SECTION 1 HULL GIRDER YIELDING STRENGTH

APPENDIX 1 DIRECT CALCULATION OF SHEAR FLOW

APPENDIX 2 HULL GIRDER ULTIMATE CAPACITY

CHAPTER 7 DIRECT STRENGTH ANALYSIS

SECTION 2 CARGO HOLD STRUCTURAL STRENGTH ANALYSIS

CHAPTER 8 BUCKLING

SECTION 2 SLENDERNESS REQUIREMENTS

SECTION 5 BUCKLING CAPACITY

CHAPTER 9 FATIGUE

SECTION 1 GENERAL CONSIDERATION

SECTION 3 FATIGUE EVALUATION

SECTION 6 DETAIL DESIGN STANDARD

CHAPTER 10 OTHER STRUCTURES

SECTION 1 FORE PART

SECTION 2 MACHINERY SPACE

SECTION 3 AFT PART

SECTION 4 TANKS SUBJECT TO SLOSHING

CHAPTER 12 CONSTRUCTION

SECTION 3 DESIGN OF WELD JOINTS

CHAPTER 13 SHIP IN OPERATION-RENEWAL CRITERIA

SECTION 1 PRINCIPLES AND SURVEY REQUIREMENTS

PART 2 SHIP TYPES

CHAPTER 1 BULK CARRIERS

SECTION 2 STRUCTURAL DESIGN PRINCIPLES

SECTION 3 HULL LOCAL SCANTLINGS

SECTION 4 HULL LOCAL SCANTLINGS FOR BULK CARRIERS L<150M

SECTION 5 CARGO HATCH COVERS

CHAPTER 2 OIL TANKERS

SECTION 3 HULL LOCAL SCANTLING

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 3 OF 30

PART 1 GENERAL HULL REQUIREMENTS

CHAPTER 1

RULE GENERAL PRINCIPLES

SECTION 2 RULE PRINCIPLES

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SECTION 5 LOADING MANUAL AND LOADING INSTRUMENTS

2 LOADING MANUALS

2.3 Requirements specific to bulk carriers

2.3.2 The loading manual is to describe:

• Envelope results and permissible limits of still water bending moments and shear forces in the hold flooded conditions according to Ch 4, Sec 4,

• The cargo hold(s) or combination of cargo holds that might be empty at full draught. If no cargo hold is allowed to be empty at full draught, this is to be clearly stated in the loading manual,

• Maximum allowable and minimum required mass of cargo and double bottom contents of each hold as a function of the draught at mid-hold position as defined in Ch 4, Sec 8, [4.3],

• Maximum allowable and minimum required mass of cargo and double bottom contents of any two adjacent holds as a function of the mean draught in way of these holds. This mean draught may be calculated by averaging the draught of the two mid-hold positions as defined in Ch 4, Sec 8, [4.3],

• Maximum allowable tank top loading together with specification of the nature of the cargo for cargoes other than bulk cargoes,

• Maximum allowable load on deck and hatch covers. If the ship is not approved to carry load on deck or hatch covers, this is to be clearly stated in the loading manual,

• Maximum rate of ballast change together with the advice that a load plan is to be agreed with the terminal on the basis of the achievable rates of change of ballast.

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 5 OF 30

CHAPTER 3

STRUCTURAL DESIGN PRINCIPLES

SECTION 6 STRUCTURAL DETAIL PRINCIPLES

10 BULKHEAD STRUCTURE

10.4 Corrugated bulkhead

10.4.2 Construction

The main dimensions a bf-cg, R, c bw-cg, d dcg, tf, tw, sC scg of corrugated bulkheads are defined in Figure 21.

The corrugation angle ϕ φ is not to be less than 55°.

When welds in a direction parallel to the bend axis are provided in the zone of the bend, the welding procedures are to be submitted to the Society for approval.

R

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 6 OF 30

10.4.3 Corrugated bulkhead depth

The depth of the corrugation, d dcg, in mm, is not to be less than:

𝑑𝑑𝑐𝑐𝑐𝑐 = 1000ℓ𝑐𝑐

𝐶𝐶

where:

ℓ𝑐𝑐 : Mean span of considered corrugation, in m, as defined in [10.4.5].

C : Coefficient to be taken as:

C = 15 for tank and water ballast cargo hold bulkheads.

C = 18 for dry cargo hold bulkheads.

10.4.4 Actual section modulus of corrugations

The net section modulus of a corrugation may be obtained, in cm3, from the following formula:

𝑍𝑍 = �

𝑑𝑑𝑐𝑐𝑐𝑐�3𝑏𝑏𝑓𝑓−𝑐𝑐𝑐𝑐𝑡𝑡𝑓𝑓 + 𝑏𝑏𝑤𝑤−𝑐𝑐𝑐𝑐𝑡𝑡𝑤𝑤�

�10−3 tf, tw : Net thickness of the plating of the corrugation, in mm, shown in Figure 21.

d dcg, a bf-cg, c bw-cg : Dimensions of the corrugation, in mm, shown in Figure 21.

Where the web continuity is not ensured at ends of the bulkhead, the net section modulus of a corrugation is to be obtained, in cm3, from the following formula:

𝑍𝑍 = 0.5𝑏𝑏𝑓𝑓−𝑐𝑐𝑐𝑐𝑡𝑡𝑓𝑓𝑑𝑑𝑐𝑐𝑐𝑐10−3

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 7 OF 30

CHAPTER 4

LOADS

SECTION 4 HULL GIRDER LOADS

SYMBOLS

Cw : Wave coefficient, in m, to be taken as:

SECTION 6 INTERNAL LOADS

6 SLOSHING PRESSURES IN TANKS

6.3 Sloshing pressure due to longitudinal liquid motion

6.3.4 Sloshing pressure on internal web frames or transverse stringers adjacent to a transverse bulkhead

Figure 13 : Sloshing pressure distribution on transverse stringers and web frames

A)

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 8 OF 30

6.4.3 Sloshing pressure in way of longitudinal bulkheads

The sloshing pressure in way of longitudinal bulkheads including wash bulkheads due to transverse liquid motion, Pslh-t, in kN/m2, for a particular filling level, is to be taken as:

75.03.07 GM

B b fgP slh slhslhtslh

−=− ρ bslh : Effective sloshing breadth defined in [6.4.2].

GM : Metacentric height, given in Ch 4, Sec 3, [2.1.1].

For the calculation of sloshing pressure in ballast tanks the ‘ballast condition’ is to be used for oil tankers and the ‘normal ballast condition’ for bulk carriers.

For the calculations of sloshing pressure in cargo tanks of oil tankers, the ‘partial load condition’ is to be used.

fslh : Coefficient defined in [6.3.3].

Figure 14 : Sloshing pressure distribution on longitudinal stringers and girders

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 9 OF 30

7 DESIGN PRESSURE FOR TANK TESTING

7.1 Definition

7.1.1 The actual strength testing is to be carried out in accordance with Ch 1, Sec 2, [3.8.4]. In order to assess the structure, static design pressures are to be applied.

The design pressure for tank testing, PST, in kN/m2, is to be taken as:

PST = 10 (zST – z) zST : Design testing load height, in m, as defined in Table 13.

Table 13 : Design testing load height zST

Compartment zST

Hopper side tanks, topside tanks, double side tanks, fore and aft peaks used as tank, cofferdams

The greater of the following:

zST = ztop + hair zST = ztop + 2.4 (partial table shown only)

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 10 OF 30

SECTION 8 LOADING CONDITIONS

3 OIL TANKERS

3.1 Specific design loading conditions

3.1.1 Seagoing conditions

The following seagoing loading conditions are to be included, as a minimum, in the loading manual:

a) Heavy ballast condition where the ballast tanks may be full, partially full or empty. Where ballast tanks are partially full, the conditions in [2.2.1] are to be complied with. The fore peak water ballast tank is to be full, if fitted. If upper and lower fore peak tanks are fitted, the lower is required to be full and the upper tank may be full, partially full or empty. All the cargo tanks are to be empty including cargo tanks suitable for the carriage of water ballast at sea. The draught at the forward perpendicular is not to be less than that for the normal ballast condition. The propeller is to be fully immersed. The trim is to be by the stern and is not to exceed 0.015 LLLL.

4 BULK CARRIERS

4.1 Specific design loading condition

4.1.1 Seagoing conditions

The following seagoing loading conditions are to be included, as a minimum, in the loading manual:

a) Cargo loading conditions as defined in [4.1.2] to [4.1.4].

b) Heavy ballast condition where the ballast tanks may be full, partially full or empty. Where ballast tanks are partially full, the conditions in [2.2.1] are to be complied with. The propeller immersion/Dp is to be at least 60%.

The trim is to be by the stern and is not to exceed 0.015 LLLL. The moulded forward draught is not to be taken less than the smaller of 0.03 L or 8 m.

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 11 OF 30

CHAPTER 5

HULL GIRDER STRENGTH

SECTION 1 HULL GIRDER YIELDING STRENGTH

3 HULL GIRDER SHEAR STRENGTH ASSESSMENT

3.4 Effective net thickness for longitudinal bulkheads between cargo tanks of oil tankers

3.4.4 Shear force correction for a ship with two longitudinal bulkheads between the cargo tanks f3 : Shear force distribution factor, as defined in Table 57.

A1-n50, A2-n50, A3-n50:Net areas, as defined in Table 5 Table 7, in m2.

3.5 Effective net thickness for longitudinal bulkheads between cargo tanks of oil tankers - Correction due to loads from transverse bulkhead stringers

3.5.1 In way of transverse bulkhead stringer connections, within areas as specified in Figure 7 Figure 8, the equivalent net thickness of plate, tsti-k-n50 in mm, where the index k refers to the identification number of the stringer, is not to be taken greater than:

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APPENDIX 1

DIRECT CALCULATION OF SHEAR FLOW

1 CALCULATION FORMULA

1.2 Determinate shear flow

1.2.2 Assuming the cross section is composed of line segments as shown in Figure 1, the determinate shear flow can be calculated by the following equation.

Dinik ny n DDk qzzz

I tqq +−+

)2( qDk, qDi : Determinate shear flow at node k and node i respectively, in N/mm.

: Length of line segments, in m.

zk, zi : Z coordinate of the end point of line segment, in m, as defined in Figure 1.

Figure 1 : Definition of line segment

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 13 OF 30

APPENDIX 2 HULL GIRDER ULTIMATE CAPACITY

SYMBOLS

For symbols not defined in this article, refer to Ch 1, Sec 4.

Iy-n50 : Moment of inertia, in m4, of the hull transverse section around its horizontal neutral axis, to be calculated according to Ch 5, Sec 1.

ZB-n50, ZD-n50: Section moduli, in m3, at bottom and deck, respectively, defined in Ch 5, Sec 1.

ReHs : Minimum yield stress, in N/mm2, of the material of the considered stiffener.

ReHp : Minimum yield stress, in N/mm2, of the material of the considered plate.

As-n50 : Net sectional area, in cm2, of stiffener, without attached plating.

Ap-n50 : Net sectional area, in cm2, of attached plating.

zi : z coordinate, in m, of centre of gravity of the ith element.

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CHAPTER 7

DIRECT STRENGTH ANALYSIS

SECTION 2 CARGO HOLD STRUCTURAL STRENGTH ANALYSIS

4 LOAD APPLICATION

4.4 Procedure to adjust hull girder shear forces and bending moments

4.4.8 Procedure to adjust vertical and horizontal bending moments for midship cargo hold region

Mlineload : Vertical bending moment, in kNm, at position x, due to application of vertical line loads at frames according to method 2, to be taken as:

F : Reaction force, in kN, at model ends due to application of vertical loads to frames as defined in Table

7.

X : X-coordinate, in m, of frame in way of the mid-hold.

δwi : vertical load, in kN, at web frame station i applied to generate required shear force.

δwi = - δw1 when frame i is within after hold δwi = δw2 when frame i is within mid-hold δwi = - δw3 when frame i is within forward hold

In case the target horizontal bending moment needs to be reached, an additional horizontal bending moment is to be applied at the ends of the cargo tank FE model to generate this target value within the mid-hold. The additional horizontal bending moment is to be taken as:

4.5 Procedure to adjust hull girder torsional moments

4.5.2 Torsional moment due to local loads

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CHAPTER 8

BUCKLING

SECTION 2 SLENDERNESS REQUIREMENTS

5 BRACKETS

5.3 Edge reinforcement

5.3.1 Edge reinforcements of bracket edges

The depth of stiffener web, hw in mm, of edge stiffeners in way of bracket edges is not to be less than:

hw = C lb/1000 �𝑅𝑅𝑒𝑒𝑒𝑒 or 50 mm, whichever is greater.

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 17 OF 30

SECTION 5 BUCKLING CAPACITY

3 BUCKLING CAPACITY OF OTHER STRUCTURES (RCN1 TO 01 JAN 2014)

3.1 Struts, pillars and cross ties

3.1.3 Elastic torsional buckling stress

Table 7 Cross sectional properties

( ) 433 50 102

1 −

− += wwtffunsv tdtbI

( ) 433 102 1 −+= wwtffusv tdtbI cm4

00 =y cm

105.0

10 1212 ffuwwt wwt ffwwt wwt tbtd td tbtd tdz cm

)6(12

)23( − ffuwwt ffuwwtwwtfu warp tbtd tbtdtdb c cm6

( ) 433

11 102

1 −+++= wwtffffffsv tdtbtbtbI cm4

00 =y cm

332211

0 2 10)5.0( ffffffwwt wwtfwtf s tbtbtbtd tdtdb zz cm

1 10200 s wt f ff sfwarp zdI bI zIc cm6

( ) 4

1 10

21212

= ffffff f btbttb I cm4

2 10

−= ff f tb

I cm4

3 10

−= ff f tb

I cm4

3 10− ff wtf s II dI z cm

CORRIGENDA 1 TO 01 JANUARY 2017 VERSION PAGE 18 OF 30

CHAPTER 9

FATIGUE

SECTION 1 GENERAL CONSIDERATION

6 LOADING CONDITIONS

6.3 Loading conditions for bulk carriers

6.3.1 Table 3 Fraction of time for each loading condition of bulk carriers

Ship length Loading conditions )( jα

BC-A BC-B, BC-C

L < 200 m

Homogeneous 0.60 0.70

Alternate 0.10 -

Normal Ballast(1) 0.15 0.05

Heavy Ballast(1) 0.15 0.25

L ≥ 200 m

Homogeneous 0.25 0.50

Alternate 0.25 -

Normal Ballast 0.20 0.20

Heavy Ballast 0.30 0.30

(1) For BC-B and BC-C without heavy ballast cargo hold, fraction of time α(j) for normal ballast is 30%0.30 and for heavy ballast 0%.

SECTION 3 FATIGUE EVALUATION

3.2 Mean stress effect

3.2.1 Correction factor for mean stress effect

σmean, i(j) : Fatigue mean stress, in N/mm², for base material calculated according to [3.2.2] or welded joint calculated according to [3.2.2], [3.2.3] or [3.2.4] as applicable.

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SECTION 6 DETAIL DESIGN STANDARD

4 HOPPER KNUCKLE CONNECTION

4.1 Design standard C to H

4.1.6

Table 5 Design standard E – hopper knuckle connection detail, welded, bulk carrier

Connections of floors in double bottom tanks to hopper tanks

Welded knuckle connection of hopper tank sloping plating to inner bottom plating

Critical areas Design standard E

Critical locations

(omitted)

B B

B-B

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CHAPTER 10

OTHER STRUCTURES

SECTION 1 FORE PART

2 STRUCTURAL ARRANGEMENT

2.1 Floors and bottom girders

2.1.2 Bottom girders

A supporting structure is to be provided at the centreline either by extending the centreline girder to the stem or by providing a deep girder or centreline bulkhead.

Where a centreline girder is fitted, the minimum depth and thickness is not to be less than that required for the depth of the double bottom in the neighbouring cargo tank hold region, and the upper edge is to be stiffened.

In case of transverse framing, the spacing of bottom girders is not to exceed 2.5 m.

In case of longitudinal framing, the spacing of bottom girders is not to exceed 3.5 m.

3 STRUCTURE SUBJECTED TO IMPACT LOADS

3.2.7 Primary supporting members

b) Simplified calculation of slamming shear force For simple arrangements of primary supporting members, where the grillage affect effect may be ignored, the shear force, QSL, in kN, is given by:

SLdistptSL FffQ =

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SECTION 2 MACHINERY SPACE

3 MACHINERY FOUNDATIONS

3.1 General

3.1.2

Figure 1 : Machinery foundations Type 1

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SECTION 3 AFT PART

3 STERN FRAMES

3.1 General

3.1.2 Cast steel and fabricated stern frames are to be strengthened by adequately spaced plates with gross thickness not less than 80% of required thickness for stern frames, t1,as defined in Table 1 or Table 2. Abrupt changes of section are to be avoided in castings; all sections are to have adequate tapering radius.

3.2 Propeller posts

3.2.1 Gross scantlings of propeller posts

The gross scantlings of propeller posts are not to be less than those obtained from the formulae in Table 1 for single screw ships and Table 2 for twin screw ships.

Scantlings and proportions of the propeller post which differ from those above may be considered acceptable provided that the section modulus of the propeller post section about its longitudinal axis is not less than that calculated with the propeller post scantlings in Table 1 or Table 2, as applicable.

3.3 Connections

3.3.4 Connection with centre keelson girder

Where the stern frame is made of cast steel, the lower part of the stern frame is to be fitted, as far as practicable, with a longitudinal web for connection with the centre keelson girder.

SECTION 4 TANKS SUBJECT TO SLOSHING

1 GENERAL

1.3 Application of sloshing pressure

1.3.5 Application of design sloshing pressure due to transverse liquid motion t1

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The design sloshing pressure due to transverse liquid motion, Pshl-t Pslh-t, as defined in Ch 4, Sec 6, [6.4.3], is to be applied to the following members as shown in Figure 2.

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CHAPTER 12

CONSTRUCTION

SECTION 3 DESIGN OF WELD JOINTS

2 TEE OR CROSS JOINT

2.5 Weld size criteria

2.5.3 Figure 4 : Weld scantlings definitions

4 OTHER TYPES OF JOINTS

4.1 Lapped joints

4.1.3 Overlaps for lugs

The overlaps for lugs and collars in way of cut-outs for the passage of stiffeners through webs and bulkhead plating are not to be less than three times the thickness of the lug but need not be greater than 50 mm.

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CHAPTER 13

SHIP IN OPERATION-RENEWAL CRITERIA

SECTION 1 PRINCIPLES AND SURVEY REQUIREMENTS

1.3 Requirements for documentation

1.3.2 Hull girder sectional properties

The Midship section plan to be supplied onboard the ship is to include the minimum required hull girder sectional properties, as defined in Ch 5, Sec 1, for the typical transverse sections of all cargo holds.

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PART 2

SHIP TYPES

CHAPTER 1

BULK CARRIERS

SECTION 2 STRUCTURAL DESIGN PRINCIPLES

3 STRUCTURAL DETAIL PRINCIPLES

3.3 Deck structures

3.3.4 Openings in strength deck- Corner of hatchways

a) Within the cargo hold region

For cargo hatchways located within the cargo hold region, insert plates, whose the thicknesses of which are to be determined according to the formula given after, are to be fitted in way of corners where the plating cutout has a circular profile.

The radius of circular corners is not to be less than 5% of the hatch width, where a continuous longitudinal deck girder is fitted below the hatch coaming.

Corner radius, in the case of the arrangement of two or more hatchways athwartship, is considered by the Society on a case-by-case basis.

For hatchways located within the cargo hold region, insert plates are, in general, not required in way of corners where the plating cut-out has an elliptical or parabolic profile and the half axes of elliptical openings, or the half lengths of the parabolic arch, are not less than:

• 1/20 of the hatchway width or 600 mm, whichever is the lesser, in the transverse direction.

• Twice the transverse dimension, in the fore and aft direction.

Where insert plates are required, their net thickness is to be obtained, in mm, from the following formula:

without being taken less than toff or greater than 1.6 toff.

l : Width, in m, in way of the corner considered, of the cross deck strip between two consecutive hatchways, measured in the longitudinal direction, see Pt 1, Ch 3, Sec 6, Figure 15.

b : Width, in m, of the hatchway considered, measured in the transverse direction, see Pt 1, Ch 3, Sec 6, Figure 15.

toff : Offered net thickness, in mm, of the deck at the side of the hatchways.

For the extreme corners of end hatchways, insert plates are required. The net thickness of these insert plates is to be 60% greater than the net offered thickness of the adjacent deck plating. A lower thickness may be accepted by the Society on the basis of calculations showing that stresses at hatch corners are lower than permissible values.

Where insert plates are required, the arrangement is shown in Pt 1, Ch 9, Sec 6, Table 15, in which d1, d2, d3 and d4 are to be greater than the stiffener spacing.

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For ships having length L of 150 m or above, the corner radius, the thickness and the extent of insert plate may be determined by the results of a direct strength assessment according to Pt 1, Ch 7, including buckling check and fatigue strength assessment of hatch corners according to Pt 1, Ch 8 and Pt 1, Ch 9 respectively.

For such type of ships it is recommended to arrange circular hatch corners.

b) Outside the cargo hold region

For hatchways located outside the cargo hold region, a reduction in the thickness of the insert plates in way of corners may be considered by the Society on a case-by-case basis.

SECTION 3 HULL LOCAL SCANTLINGS

3 TRANSVERSE VERTICALLY CORRUGATED WATERTIGHT BULKHEADS SEPARATING CARGO

HOLDS IN FLOODED CONDITION

3.3.3 Effective shedder plates

Provided that effective shedder plates are fitted as shown in Figure 4, when calculating the section modulus at the lower end of the corrugations (Sections ’1’ in Figure 4), the net area, in cm2, of flange plates may be increased by the factor ISH to be taken as:

3.3.4 Effective gusset plates

Provided that effective gusset plates are fitted, when calculating the section modulus at the lower end of the corrugations (Sections ‘1’ in Figure 5 and Figure 6), the net area, in cm2, of flange plates may be increased by the factor IG to be taken as:

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SECTION 4 HULL LOCAL SCANTLINGS FOR BULK CARRIERS L<150M

4 PRIMARY SUPPORTING MEMBERS

4.2 Design load sets

4.2.2 Loading conditions

The severest loading conditions from the loading manual or otherwise specified by the designer are to be considered for the calculation of Pin in design load sets BC-911 to BC-1012.

If primary supporting members support deck structure or tank/watertight boundaries, applicable design load sets in Pt 1, Ch 6, Sec 2, Table 1 are also to be considered.

4.7 Primary supporting member in bilge hopper tanks and topside tanks

4.7.2 Net section modulus, net shear sectional area and web thickness The net section modulus Z, in cm3, the net shear sectional area Ashr, in cm2, and the net web thickness tw, in mm, subjected to lateral pressure are not to be less than the values obtained from the following formulae:

eHprsbdg bdg

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75.1 shr eHprtw w A C

Ch t τ−= where:

P : Design pressure in kN/m2, for the design load set being considered according to Pt 1, Ch 6, Sec 2, [2.1.3], calculated at the mid-point of span of a web frame located midway between transverse bulkheads of holds.

S : Spacing of primary supporting members, in m.

bdg : Effective bending span, in m, of primary supporting members, measured between the supporting members as defined in Pt 1, Ch 3, Sec 7, [1.1.6].

shr : Effective shear span, in m, of primary supporting members, measured between the supporting members as defined in Pt 1, Ch 3, Sec 7, [1.1.7].

fbdg : Bending moment factor:

• For continuous stiffeners primary supporting members and where end connections are fitted consistent with idealisation of the stiffener primary supporting members as having

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as fixed ends and is not to be taken higher than:

fbdg = 10.

• For stiffener primary supporting members with reduced end fixity, the yield check is to be considered on a case-by-case basis.

SECTION 5 CARGO HATCH COVERS

5 STRENGTH CHECK

5.1.1 Application

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CHAPTER 2

OIL TANKERS

SECTION 3 HULL LOCAL SCANTLING

1 PRIMARY SUPPORTING MEMBERS IN CARGO HOLD REGION

1.4 Girders in double bottom

1.4.2 Net shear area of centre girders

n1 : Coefficient taken as:

n2 : Coefficient taken as:

S : Double bottom floor spacing, in m, as defined in Pt 1 Ch 3 Sec 7 [1.2.2]

1.4.3 Net shear area of side girders

n3 : Coefficient taken as:

n4 : Coefficient taken as:

S : Double bottom floor spacing, in m, as defined in Pt 1 Ch 3 Sec 7 [1.2.2]

Foreword

These Rules enter into force on 1st July 2017 and supersede the following Rules:

• Common Structural Rules for Bulk Carriers and Oil Tankers, January 2015

These Common Structural Rules consist of two parts. Part One provides requirements common to both Double Hull Oil Tankers and Bulk Carriers and Part Two provides additional requirements applied to either Double Hull Oil Tankers or Bulk Carriers.

Summary of changes from the 01 JAN 2015 Rules

Amendment Type / No. Adoption Date Rule Version Date Effective Date

1 Corrigenda 1 20 JAN 2016 01 JAN 2015 01 JAN 2015

2 Urgent Rule Change Notice 1 09 DEC 2016 01 JAN 2015 01 JUL 2017

Note: Full revision history for Common Structural Rules is available on IACS website, including all previous RCNs and associated TBs.

Guideline of RCN Label

1. RCN (Rule Change Notice) label is used to identify the rule change made since last rule version with the format of “RCN {Number} to {Rule Version Date}”, e.g. RCN 1 to 01 JAN 2015.

2. For corrigenda update, the same format will be followed, e.g. CORR 1 to 01 JAN 2015.

3. Modification and addition of rule texts:

RCN label is inserted at the end of modified contents.

4. Modification and addition of titles, figures and tables:

RCN label is inserted at the end of modified contents.

5. Deletion of rule texts and titles:

Replace contents by the word “DELETED”.

RCN label is inserted at the end of the word “DELETED”.

6. Deletion of Table:

Replace contents of Table by the word “DELETED” (only shown first row).

RCN label is inserted at the second row of Table.

7. Deletion of Figure:

Replace Figure by a generic graphic marked “DELETED”.

RCN label is inserted under the generic graphic.

Disclaimer Copyright in these Common Structural Rules is owned by each IACS Member as at 1st July 2012.

Copyright © IACS 1st July 2012.

The IACS members, their affiliates and subsidiaries and their respective officers, employees or agents (on behalf of whom this disclaimer is given) are, individually and collectively, referred to in this disclaimer as the "IACS Members". The IACS Members assume no responsibility and shall not be liable whether in contract or in tort (including negligence) or otherwise to any person for any liability, or any direct, indirect or consequential loss, damage or expense caused by or arising from the use and/or availability of the information expressly or impliedly given in this document, howsoever provided, including for any inaccuracy or omission in it. For the avoidance of any doubt, this document and the material contained in it are provided as information only and not as advice to be relied upon by any person.

Any dispute concerning the provision of this document or the information contained in it is subject to the exclusive jurisdiction of the English courts and will be governed by English law.

01 Jan 2017

IACS

Table of Contents

Part 1 General Hull Requirements Part 2 Ship Types

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PART 1

GENERAL HULL REQUIREMENTS

Table of Contents Chapter 1: Rule General Principles

Chapter 2: General Arrangement Design

Chapter 3: Structural Design Principles

Chapter 4: Loads

Chapter 5: Hull Girder Strength

Chapter 6: Hull Local Scantling

Chapter 7: Direct Strength Analysis

Chapter 8: Buckling

Chapter 9: Fatigue

Chapter 10: Other Structures

Chapter 11: Superstructure, Deckhouses and Hull Outfitting

Chapter 12: Construction

Chapter 13: Ship in Operation - Renewal Criteria

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Table of Contents Chapter 1: Rule General Principles

SECTION 1

Application

1 Scope of Application 2 Rule Application 3 Class Notations 4 Application of the Rules of the Society

SECTION 2

Rule Principles

1 General 2 General Assumptions 3 Design Basis 4 Design Principles 5 Rule Design Methods

SECTION 3

Verification of Compliance

1 General 2 Documents to be Submitted 3 Scope of Approval 4 Workmanship 5 Structural Details 6 Equivalence Procedures

SECTION 4

Symbols and Definitions

1 Primary Symbols and Units 2 Symbols 3 Definitions

SECTION 5

Loading Manual and Loading Instruments

1 General Requirements 2 Loading Manuals 3 Loading Instrument 4 Loading Specific to Bulk Carriers

Chapter 2: General Arrangement Design

SECTION 1

General

1 General

SECTION 2

Subdivision Arrangement

1 Watertight Bulkhead Arrangement 2 Collision Bulkhead 3 Aft Peak Bulkhead

SECTION 3

Compartment Arrangement

1 Cofferdams 2 Double Bottom 3 Double Side 4 Fore End Compartments 5 Fuel Oil Tanks 6 Aft End Compartments 7 Ballast Tanks

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Access Arrangement

1 Closed spaces 2 Cargo Area and Forward Spaces

Chapter 3: Structural Design Principles

SECTION 1

Materials

1 General 2 Hull Structural Steel 3 Steels for Forging and Casting 4 Aluminium Alloys 5 Other Materials and Products

SECTION 2

Net Scantling Approach

1 General

SECTION 3

Corrosion Additions

1 General

SECTION 4

Corrosion Protection

1 General 2 Sacrificial Anodes

SECTION 5

Limit States

1 General 2 Criteria 3 Strength Check Against Impact Loads

SECTION 6

Structural Detail Principles

1 Application 2 General Principles 3 Stiffeners 4 Primary Supporting Members (PSM) 5 Intersection of Stiffeners and Primary Supporting Members 6 Openings 7 Double Bottom Structure 8 Double Side Structure 9 Deck Structure 10 Bulkhead Structure 11 Pillars

SECTION 7

Structural Idealisation

1 Structural Idealisation of Stiffeners and Primary Supporting Members 2 Plates 3 Stiffeners 4 Primary Supporting Members

Chapter 4: Loads

SECTION 1

Introduction

1 General

SECTION 2

Dynamic Load Cases

1 General

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2 Dynamic Load Cases for Strength Assessment 3 Dynamic Load Cases for Fatigue Assessment

SECTION 3

Ship Motions and Accelerations

1 General 2 Ship Motions and Accelerations 3 Accelerations at any Position

SECTION 4

Hull Girder Loads

1 Application 2 Vertical Still Water Hull Girder Loads 3 Dynamic Hull Girder Loads

SECTION 5

External Loads

1 Sea Pressure 2 External Pressures on Exposed Decks 3 External Impact Pressures for the Bow Area 4 External Pressures on Superstructure and Deckhouses 5 External Pressures on Hatch Covers

SECTION 6

Internal Loads

1 Pressures Due to Liquids 2 Pressures and Forces Due to Dry Bulk Cargo 3 Pressures and Forces Due to Dry Cargoes in Flooded Conditions 4 Steel Coil Loads in Cargo Holds of Bulk Carriers 5 Loads on Non-Exposed Decks and Platforms 6 Sloshing Pressures in Tanks 7 Design Pressure For Tank Testing

SECTION 7

Design Load Scenarios

1 General 2 Design Load Scenarios for Strength Assessment 3 Design Load Scenarios for Fatigue Assessment

SECTION 8

Loading Conditions

1 Application 2 Common Design Loading Conditions 3 Oil Tankers 4 Bulk Carriers 5 Standard Loading Conditions for Fatigue Assessment

APPENDIX 1

Hold Mass Curves

1 General 2 Maximum and Minimum Masses of Cargo in Each Hold 3 Maximum and Minimum Masses of Cargo of Two Adjacent Holds

Chapter 5: Hull Girder Strength

SECTION 1

Hull Girder Yielding Strength

1 Strength Characteristics of Hull Girder Transverse Sections 2 Hull Girder Bending Assessment 3 Hull Girder Shear Strength Assessment

SECTION 2

Hull Girder Ultimate Strength

1 Application

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2 Checking Criteria

SECTION 3

Hull Girder Residual Strength

1 Application 2 Checking Criteria

APPENDIX 1

Direct Calculation of Shear Flow

1 Calculation Formula 2 Example of Calculations for a Single Side Hull Cross Section

APPENDIX 2

Hull Girder Ultimate Capacity

1 General 2 Incremental-Iterative Method 3 Alternative Methods

Chapter 6: Hull Local Scantling

SECTION 1

General

1 Application

SECTION 2

Load Application

1 Load Combination 2 Design Load Sets

SECTION 3

Minimum Thicknesses

1 Plating 2 Stiffeners and Tripping Brackets 3 Primary Supporting Members

SECTION 4

Plating

1 Plating Subjected to Lateral Pressure 2 Special Requirements

SECTION 5

Stiffeners

1 Stiffeners Subject to Lateral Pressure

SECTION 6

Primary Supporting Members and Pillars

1 General 2 Primary Supporting Members Within Cargo Hold Region 3 Primary Supporting Members Outside Cargo Hold Region 4 Pillars

Chapter 7: Direct Strength Analysis

SECTION 1

Strength Assessment

1 General 2 Net Scantling 3 Finite Element Types 4 Submission of Results 5 Computer Programs

SECTION 2

Cargo Hold Structural Strength Analysis

1 Objective and Scope 2 Structural Model

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3 FE Load Combinations 4 Load Application 5 Analysis Criteria

SECTION 3

Local Structural Strength Analysis

1 Objective and Scope 2 Local Areas to be Assessed by Fine Mesh Analysis 3 Screening Procedure 4 Structural Modelling 5 FE Load Combinations 6 Analysis Criteria

Chapter 8: Buckling

SECTION 1

General

1 Introduction 2 Application 3 Definitions

SECTION 2

Slenderness Requirements

1 Structural Elements 2 Plates 3 Stiffeners 4 Primary Supporting Members 5 Brackets 6 Other Structures

SECTION 3

Prescriptive Buckling Requirements

1 General 2 Hull Girder Stress 3 Buckling Criteria

SECTION 4

Buckling Requirements for Direct Strength Analysis

1 General 2 Stiffened and Unstiffened Panels 3 Corrugated Bulkhead 4 Vertically Stiffened Side Shell of Single Side Skin Bulk Carrier 5 Struts, Pillars and Cross Ties

SECTION 5

Buckling Capacity

1 General 2 Buckling Capacity of Plates and Stiffeners 3 Buckling capacity of other structures

APPENDIX 1

Stress Based Reference Stresses

1 Stress based method 2 Reference Stresses

Chapter 9: Fatigue

SECTION 1

General Considerations

1 Rule Application for Fatigue Requirements 2 Definition 3 Assumptions 4 Methodology

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5 Corrosion Model 6 Loading Conditions 7 Load Cases

SECTION 2

Structural Details to be Assessed

1 Simplified Stress Analysis 2 Finite Element Analysis

SECTION 3

Fatigue Evaluation

1 Fatigue Analysis Methodology 2 Acceptance Criteria 3 Reference Stresses for Fatigue Assessment 4 S-N Curves 5 Fatigue Damage Calculation 6 Weld Improvement Methods 7 Workmanship

SECTION 4

Simplified Stress Analysis

1 General 2 Hot Spot Stress 3 Hull Girder Stress 4 Local Stiffener Stress 5 Stress Concentration Factors

SECTION 5

Finite Element Stress Analysis

1 General 2 FE Modelling 3 Hot Spot Stress for Details Different From Web-Stiffened Cruciform Joints 4 Hot Spot Stress for Web-Stiffened Cruciform Joint 5 Limitations of Hot Spot Stress Approach 6 Screening Fatigue Assessment

SECTION 6

Detail Design Standard

1 General 2 Stiffener-Frame Connections 3 Scallops in way of Block Joints 4 Hopper Knuckle Connection 5 Horizontal Stringer Heel 6 Bulkhead Connection to Lower and Upper Stool 7 Bulkhead Connection to Inner Bottom 8 Lower and Upper Toe of Hold Frame 9 Hatch Corner

Chapter 10: Other Structures

SECTION 1

Fore Part

1 General 2 Structural Arrangement 3 Structure Subjected to Impact Loads 4 Additional Scantling Requirements

SECTION 2

Machinery Space

1 General 2 Machinery Space Arrangement 3 Machinery Foundations

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SECTION 3

Aft Part

1 General 2 Aft Peak 3 Stern Frames 4 Special Scantling Requirements for Shell Structure

SECTION 4

Tanks Subject to Sloshing

1 General 2 Scantling Requirements

Chapter 11: Superstructure, Deckhouses and Hull Outfitting

SECTION 1

Superstructures, Deckhouses and Companionways

1 General 2 Structural Arrangement 3 Scantlings

SECTION 2

Bulwark and Guard Rails

1 General Requirements 2 Bulwarks 3 Guard Rails

SECTION 3

Equipment

1 General 2 Equipment Number Calculation 3 Anchoring Equipment

SECTION 4

Supporting Structure for Deck Equipment and Fittings

1 General 2 Anchoring Windlass and Chain Stopper 3 Mooring Winches 4 Cranes, Derricks, Lifting Masts and Life Saving Appliances 5 Bollards and Bitts, Fairleads, Stand Rollers, Chocks and Capstans 6 Miscellaneous Deck Fittings

SECTION 5

Small Hatchways

1 General 2 Small Hatchways Fitted on the Exposed Fore Deck

Chapter 12: Construction

SECTION 1

Construction and Fabrication

1 General 2 Cut-Outs, Plate Edges 3 Cold Forming 4 Hot Forming 5 Assembly and Alignment

SECTION 2

Fabrication by Welding

1 General 2 Welding Procedures, Welding Consumables and Welders 3 Weld Joints 4 Non-Destructive Examination (NDE)

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SECTION 3

Design of Weld Joints

1 General 2 Tee or Cross Joint 3 Butt Joint 4 Other Types of Joints 5 Connection Details

Chapter 13: Ship in Operation - Renewal Criteria

SECTION 1

Principles and Survey Requirements

1 Principles 2 Hull Survey Requirements

SECTION 2

Acceptance Criteria

1 General 2 Renewal Criteria

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PART 1 CHAPTER1

RULE GENERAL PRINCIPLES

Table of Contents

SECTION 1

Application

1 Scope of Application 2 Rule Application 3 Class Notations 4 Application of the Rules of the Society

SECTION 2

Rule Principles

1 General 2 General Assumptions 3 Design Basis 4 Design Principles 5 Rule Design Methods

SECTION 3

Verification of Compliance

1 General 2 Documents to be Submitted 3 Scope of Approval 4 Workmanship 5 Structural Details 6 Equivalence Procedures

SECTION 4

Symbols and Definitions

1 Primary Symbols and Units 2 Symbols 3 Definitions

SECTION 5

Loading Manual and Loading Instruments

1 General Requirements 2 Loading Manuals 3 Loading Instrument 4 Loading Specific to Bulk Carriers

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SECTION 1

APPLICATION

1 SCOPE OF APPLICATION

1.1 General

1.1.1

These Rules apply to the following ships:

a) Bulk carriers and double hull oil tankers and;

b) Being self-propelled ships with unrestricted navigation, and;

c) Contracted for construction on or after 1st July 2015.

Note 1: Unrestricted navigation means that the ship is not subject to any geographical restrictions (i.e. any oceans, any seasons) except that limited by the ship’s capability for operation in ice.

Note 2: The ‘contracted for construction’ means the date on which the contract to build the ship is signed between the prospective owner and the builder. For further details regarding the date of ‘contracted for construction’, refer to IACS Procedural Requirement (PR) No. 29.

1.1.2

These Rules apply to ships constructed of welded steel structures and composed of stiffened plate panels. The ship’s structure is to be longitudinally or transversely framed with full transverse bulkheads and intermediate web frames.

The typical arrangements of ships covered by the rules assume that the structural arrangements include:

• Double bottom, the depth of which is to be in accordance with applicable statutory requirements.

• Engine room located aft of the cargo tank/hold region.

1.1.3

Ships for which these Rules are not applicable are to comply with the relevant Rules of the Society.

1.2 Scope of application for bulk carriers

1.2.1

These Rules apply to the hull structures of single side skin and double side skin bulk carriers having a length L of 90 m or above.

Bulk carriers are ships which are constructed generally with single deck, double bottom, hopper side tanks and topside tanks and with single or double side skin construction in cargo hold region and intended primarily to carry dry cargoes in bulk. Typical arrangements of bulk carriers are shown in Figure 1.

Hybrid bulk carriers, where at least one cargo hold is constructed with hopper tank and topside tank, see typical arrangements in Figure 1, and other cargo holds are constructed without hopper tank and/or topside tanks, see examples of a transverse section in Figure 2, are to comply with the strength criteria defined in these Rules.

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These Rules are not applicable to the following ship types:

• Ore carriers.

• Combination carrier.

• Woodchip carrier.

• Cement, fly ash and sugar carriers provided that loading and unloading is not carried out by grabs heavier than 10 tons, power shovels and other means which may damage cargo hold structure.

• Ships with inner bottom construction adapted for self-unloading.

Figure 1 : Typical arrangements of bulk carriers

Figure 2 : Examples of transverse sections of cargo hold without hopper tank and/or topside tank

1.3 Scope of application for oil tankers

1.3.1 Length and structural arrangement application

These Rules apply to the hull structures of double hull oil tankers having length L of 150 m or above. Oil tanker is defined as a ship which has to comply with Annex I of MARPOL73/78.

The typical arrangements of oil tankers covered by the rules are shown in Figure 3 and assume that the structural arrangements include:

• Double side structure with breadth in accordance with statutory requirements.

• Side longitudinal, centreline longitudinal or transverse bulkheads of plane, corrugated or double skin construction.

• Single deck structure.

The cross sections shown in Figure 3 are typical examples only and other variations of cross tie and web frame arrangements are also covered.

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1.3.2 Cargo temperature application

The Rules are based on the following design temperatures for the cargo:

a) maximum temperature: 80°C

b) minimum temperature: 0°C.

Figure 3 : Typical arrangements of double hull oil tankers

2 RULE APPLICATION

2.1 Rule description

2.1.1 Rule structure

The rules contain 2 parts:

• Part 1: General hull requirements.

• Part 2: Ship types.

The parts are structured in chapters giving instructions for detail application and requirements which are applied in order to satisfy the rule objectives.

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2.1.2 Numbering

The system of numbering is given in Table 1.

Table 1 : Rule numbering and abbreviations

2.2 Rule Requirements

2.2.1 Part 1

Part 1 of the Rules provides requirements common to all ship types as follow:

• Chapter 1: Rule General Principles.

• Chapter 2: General Arrangement Design.

• Chapter 3: Structural Design Principles.

• Chapter 4: Loads.

• Chapter 5: Hull Girder Strength.

• Chapter 6: Hull Local Scantling.

• Chapter 7: Direct Strength Analysis.

• Chapter 8: Buckling.

• Chapter 9: Fatigue.

• Chapter 10: Other Structure.

• Chapter 11: Superstructure, Deckhouses and Hull Outfitting.

• Chapter 12: Construction.

• Chapter 13: Ship in Operation - Renewal Criteria.

The provisions of the Ch 1, 2, 3, 4, 5, 6, 8, 12, 13 and Ch 10, Sec 4 are applicable all over the ships length.

The Ch 7, 9, 10 and 11 define their own scope of application.

2.2.2 Part 2

Part 2 of the Rules provides requirements coming in addition to those of Part 1 specific for ship types and is divided as follow:

• Chapter 1: Bulk Carriers.

• Chapter 2: Oil Tankers.

2.2.3 Application of the Rules

The ship arrangement and scantlings are to comply with the relevant parts and chapters of the Rules as it is given in Figure 4.

Order Levels Example Abbreviations

1 Part Part 1 – General Hull Requirements Pt 1

2 Chapter Chapter 1 – Rule General Principle Ch 1

3 Section Section 1 – Application Sec 1

4 Article 1. Scope of Application [1]

5 Sub-article 1.1 General [1.1]

6 Requirements 1.1.1 These Rules apply to... [1.1.1]

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Figure 4 : Application of the Rules

2.2.4 General criteria

The ship arrangement, the proposed details and the offered scantling in net or gross, as the case may, are to comply with the requirements and the minimum scantling given in the Rules.

2.3 Structural requirements

2.3.1 Materials and welding

The Rules applies to welded hull structures made of steel h