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Thickness

Measurement andClose-up Survey

Guidance

Revision 5.4

April 2009

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Revision 5.4

April 2009

INTRODUCTION

PART 1 Special Survey Oil Tankers, Ore/Oil Ships, Ore/Bulk/Oil Ships,

Chemical Tankers and Ships for Liquefied Gases

PART 2 Special Survey Dry bulk cargo ships (Bulk Carriers)

PART 3 Special Survey General dry cargo ships

PART 4 Special Survey Other ship types

PART 5 Intermediate Survey All ship types

PART 6 Annual Survey All ship types

PART 7 Thickness Measurement Report Forms

Appendix 1 Permissible diminution levels for Category 1 Oil Tankers,

Chemical Tankers and Liquefied Gas Ships.

Appendix 2 Permissible diminution levels for Category 3 Oil Tankers,

Chemical Tankers and Liquefied Gas Ships

Appendix 3 Permissible diminution levels for Category 1 Bulk Carriers,

Ore/Oil Ships and Ore/Bulk/ Oil Ships.

Appendix 4 Permissible diminution levels for general dry cargo ships and all

other Category 2 and 3 type ships.

Appendix 5 Guidelines on thickness measurements for evaluation of

longitudinal strength of hull girder for oil tankers of length 130

metres and over.

Appendix 6 Guidelines on the thickness measurement of cargo hold shell

frames on single skin bulk carriers contracted for construction prior

to 1 July 1998

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INTRODUCTION

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6 Close-up Survey6.1M $67;

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7 Thickness measurement Maximumdiminution

Table I Maximum diminution of individual plates and stiffeners

Structural item Category 1 ships Category 2 & 3ships

TMReportForm

Hull envelope:>D9>J>9EB6 H6B?D= VdkW.T. and O.T. transverse bulkheads including

deep tank bulkheads RSee&7?< b C7@ B99>?>7DB6 FE6QIB@@>K>DE?>7D I@>?BT (?>CCD;>9< ?G< 6>D< 7C IB@=7 GB?IG 7HD=;T

(?>CCK>DE?>7D

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adk aWk !* YRBT

NOTES

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2.^7@ 7>6 ?BDQ

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Table II Maximum permissible diminution of topside and bottom areas

Category 1 ships Category 2 ships Category 3 ships

Structural item 7J9;G>H;

B?dAdYW/C@7KH;

B?dAdYW/C@7KH;

B?dAdYW/C@7KD= Udk adk Udk Vdk UWk VdkTopside Area+;;D=67D

Udk adk Udk Vdk UWk Vdk

26B?>D= l 97EF67D

UWk adk UWk Vdk adk Vdk

Bottom Area+;;

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Table III Upper deck plating trand Jrvalues for residual bucklingthickness calculations

/7IB?>7D

03'- dAbLBK>9;G>H; +! dAaWLC@7KBK>9;G>H;

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UdYW U[Ad adAX aUAd UXAW UYAW UYAX UVAU UVAV UVAb UUAV

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UUWd adAV aaAU aaAb UYAX UZAY UZA[ UbAd UbAV UbAV UaAU

UUYW adAY aaAX aaA[ UZAd U[AU U[AV UbAV UbAX UbAX UaAb

Uadd aUAa aVAd aVAb UZAb U[AW U[AY UbAX UbA[ UbA[ UaAX

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Part 1

Special Survey Oil Tankers,Ore/Oil Ships, Ore/Bulk/Oil/Ships,Chemical Tankers and Ships forLiquefied Gases

CONTENTS

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Table I Thickness measurement Single anddouble hull oil tankers, ore/oil ships, ore/bulk/oilships!G< C7667O>D= >DC7@KB?>7D GB; F

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1.^7@ B@D ?BDQ; OGD=; B@< C7ED9 ?7 F< >D 500. I7D9>?>7DA B; 9DD ?G< Rules for

ShipsA 2? UA $G VAUMWA ?G< 7D; B@