Annex 8A – Recommended Procedures for Thickness Measurements of Double-Side Skin Bulk Carriers Not Built Under the IACS Common Structural Rulesfootnote
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Codes - 2011 ESP Code – International Code on the Enhanced Programme of Inspections During Surveys of Bulk Carriers and Oil Tankers, 2011 – Resolution A.1049(27) - Annex A – Code on the Enhanced Programme of Inspections During the Surveys of Bulk Carriers - Part B – Code on the Enhanced Programme of Inspections During Surveys of Bulk Carriers Having Double-Side Skin Construction - Annex 8A – Recommended Procedures for Thickness Measurements of Double-Side Skin Bulk Carriers Not Built Under the IACS Common Structural Rules1

Annex 8A – Recommended Procedures for Thickness Measurements of Double-Side Skin Bulk Carriers Not Built Under the IACS Common Structural Rulesfootnote

  1 These procedures should be used for recording thickness measurements as required by part B of annex A.

  2 Thickness measurement sheet forms TM1-DSBC, TM2-DSBC(i), TM2-DSBC(ii), TM3-DSBC, TM4-DSBC, TM5-DSBC and TM6-DSBC (appendix 2) should be used, as appropriate, for recording thickness measurements. The maximum allowable diminution should be stated. The maximum allowable diminution could be stated in an attached document.

  3 Appendix 3 contains guidance diagrams and notes relating to the reporting forms and the procedure for the thickness measurements.

  4 The reporting forms should, where appropriate, be supplemented by data presented on structural sketches.

Parent topic: Part B – Code on the Enhanced Programme of Inspections During Surveys of Bulk Carriers Having Double-Side Skin Construction

Appendix 1 – General Particulars

 
Ship's name: ..............................................................................................................................
IMO number: .............................................................................................................................
Class/Administration identity number: .......................................................................................
Port of registry: ..........................................................................................................................
Gross tonnage: ..........................................................................................................................
Deadweight: ..............................................................................................................................
Date of build: .............................................................................................................................
Classification society: ................................................................................................................
 
 
Name of the firm performing thickness measurement: ...........................................................
..................................................................................................................................................
Thickness measurement firm certified by: ........................................................................
Certificate number: ....................................................................................................................
Certificate valid from: ........................................... to ............................................................
Place of measurement: .............................................................................................................
First date of measurement: .......................................................................................................
Last date of measurement: ........................................................................................................
Renewal survey/intermediate surveyfootnote due: ...............................................................................
Details of measurement equipment: ..........................................................................................
Qualification of operator: ...........................................................................................................
 
 
Report number: ................................................... consisting of ................................ pages
Name of operator: ............................................... Name of surveyor: ..................................
Signature of operator: .......................................... Signature of surveyor: ............................
Firm official stamp: .............................................. Administration: .......................................
 
Official stamp

Appendix 2 - Reports on Thickness Measurement

 TM1-DSBC

Report on thickness measurement of all deck plating, bottom shell plating and side shell platingfootnote

Ship's name.................... IMO number.......................... Class Identity No………………. Report No………………  
STRAKE POSITION                                  
PLATE POSITION No. or
letter 		Org. thk. mm Forward reading Aft reading Mean diminution (%) Maximum allowable
diminution (mm)
Gauged Diminution P Diminution S Gauged Diminution P Diminution S
P S mm % mm % P S mm % mm % P S
12th forward                                  
11th                                  
10th                                  
9th                                  
8th                                  
7th                                  
6th                                  
5th                                  
4th                                  
3rd                                  
2nd                                  
1st                                  
Amidships                                  
1st aft                                  
2nd                                  
3rd                                  
4th                                  
5th                                  
6th                                  
7th                                  
8th                                  
9th                                  
10th                                  
11th                                  
12th                                  
  Operator's signature…………………………......... Notes – see following page

 Notes to report TM1-DSBC:

1 This report should be used for recording the thickness measurement of:

  • .1 all strength deck plating within cargo length area;

  • .2 all keel, bottom shell plating and bilge plating within the cargo length area;

  • .3 side shell plating including selected wind and water strakes outside cargo length area; and

  • .4 all wind and water strakes within cargo length area.

  2 The strake position should be cleared as follows:

  • .1 for strength deck indicate the number of the strake of plating inboard from the stringer plate;

  • .2 for bottom plating indicate the number of the strake of plating outboard from the keel plate; and

  • .3 for side shell plating give number of the strake of plating below sheerstrake and letter as shown on shell expansion.

  3 Only the deck plating strakes outside line of openings are to be recorded.

  4 Measurements should be taken at the forward and aft areas of all plates and where plates cross ballast/cargo tank boundaries separate measurements for the area of plating in way of each type of tank should be recorded.

  5 The single measurements recorded should represent the average of multiple measurements.

  6 The maximum allowable diminution could be stated in an attached document.

 TM2-DSBC(i)

Report on thickness measurement of shell and deck plating at transverse sections (one, two or three transverse sections)

Ship's name.................... IMO number.......................... Class Identity No……………….   Report No………………  
STRENGTH DECK AND SHEERSTRAKE PLATING
  FIRST TRANSVERSE SECTION AT FRAME NUMBER.... SECOND TRANSVERSE SECTION AT FRAME NUMBER.... THIRD TRANSVERSE SECTION AT FRAME NUMBER....
STRAKE POSITION No. or
letter 		Orig. thk Max allow. dimin. Gauged Diminution P Diminution S No. or
letter 		Orig. thk Max. alwb. dim. Gauged Diminution P Diminution S No. or
letter 		Orig. thk Max. alwb. dim. Gauged Diminution P Diminution S
mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
Stringer plate                                                      
1st strake inboard                                                      
2nd                                                      
3rd                                                      
4th                                                      
5th                                                      
6th                                                      
7th                                                      
8th                                                      
9th                                                      
10th                                                      
11th                                                      
12th                                                      
13th                                                      
14th                                                      
centre strake                                                      
Sheer strake                                                      
TOPSIDE TOTAL                                                      
  Operator's signature…………………………......... Notes – see following page  

 Notes to report TM2-DSBC(i):

1 This report should be used for recording the thickness measurement of strength deck plating and sheer strake plating transverse sections:

  • One, two or three sections within the cargo length area, comprising of the structural items (1), (2) and (3) as shown on the diagrams of typical transverse sections (appendix 3).

  2 Only the deck plating strakes outside line of hatch openings should be recorded.

  3 The top side area comprises deck plating, stringer plate and sheerstrake (including rounded gunwales).

  4 The exact frame station of measurement should be stated.

  5 The single measurements recorded should represent the average of multiple measurements.

  6 The maximum allowable diminution could be stated in an attached document.

 TM2-DSBC(ii)

Report on thickness measurement of shell and deck plating at transverse sections (one, two or three transverse sections)

Ship's name.................... IMO number.......................... Class Identity No……………….   Report No………………  
SHELL PLATING
  FIRST TRANSVERSE SECTION AT FRAME NUMBER.... SECOND TRANSVERSE SECTION AT FRAME NUMBER.... THIRD TRANSVERSE SECTION AT FRAME NUMBER....
STRAKE POSITION No. or
letter 		Orig. thk Max allow. dimin. Gauged Diminution P Diminution S No. or
letter 		Orig. thk Max allow. dimin. Gauged Diminution P Diminution S No. or
letter 		Orig. thk Max allow. dimin. Gauged Diminution P Diminution S
mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
1st below sheer strake                                                      
2nd                                                      
3rd                                                      
4th                                                      
5th                                                      
6th                                                      
7th                                                      
8th                                                      
9th                                                      
10th                                                      
11th                                                      
12th                                                      
13th                                                      
14th                                                      
15th                                                      
16th                                                      
17th                                                      
18th                                                      
19th                                                      
20th                                                      
keel strake                                                      
BOTTOM TOTAL                                                      
  Operator's signature…………………………......... Notes – see following page  

 Notes to report TM2-DSBC(ii):

1 This report should be used for recording the thickness measurement of shell plating at transverse sections:

  • One, two or three sections within the cargo length area, comprising of the structural items (3), (4), (5) and (6) as shown on the diagrams of typical transverse sections in appendix 3.

  2 The bottom area comprises keel, bottom and bilge plating.

  3 The exact frame station of measurement should be stated.

  4 The single measurements recorded should represent the average of multiple measurements.

  5 The maximum allowable diminution could be stated in an attached document.

 TM3-DSBC

Report on thickness measurement of longitudinal members at transverse sections (one, two or three transverse sections)

Ship's name.................... IMO number.......................... Class Identity No……………….   Report No………………  
  FIRST TRANSVERSE SECTION AT FRAME NUMBER.... SECOND TRANSVERSE SECTION AT FRAME NUMBER.... THIRD TRANSVERSE SECTION AT FRAME NUMBER....
STRUCTURAL MEMBER Item No. Orig. thk Max allow. dimin. Gauged Diminution P Diminution S Item No. Orig. thk Max allow. dimin. Gauged Diminution P Diminution S Item No. Orig. thk Max allow. dimin. Gauged Diminution P Diminution S
mm mm P S mm % mm % mm mm P S mm % mm % mm mm P S mm % mm %
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
                                                       
  Operator's signature…………………………......... Notes – see following page  

 Notes to report TM3-DSBC:

1 This report should be used for recording the thickness measurement of longitudinal members at transverse sections:

  • Two, or three sections within the cargo length area comprising of the appropriate structural items (10) to (25) as shown on diagrams of typical transverse sections in appendix 3.

  2 The exact frame station of measurement should be stated.

  3 The single measurements recorded should represent the average of multiple measurements.

  4 The maximum allowable diminution could be stated in an attached document.

 TM4-DSBC

Report on thickness measurement of transverse structural members in the double-bottom, hopper side and topside water ballast tanks

Ship's name..................... IMO number.......................... Class Identity No………………. Report No………………  
TANK DESCRIPTION:
LOCATION OF STRUCTURE:
STRUCTURAL MEMBER ITEM Original thickness Max. allow. dimin. Gauged Diminution P Diminution S
mm mm P S mm % mm %
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
                           
Operator's signature…………………………......... Notes – see following page

 Notes to report TM4-DSBC:

1 This report should be used for recording the thickness measurement of transverse structural members, comprising of the appropriate structural items (30) to (34) as shown on diagrams of typical transverse sections (appendix 3).

  2 Guidance for areas of measurements is indicated in appendix 3.

  3 The single measurements recorded should represent the average of multiple measurements.

  4 The maximum allowable diminution could be stated in an attached document.

 TM5-DSBC

Report on thickness measurement of watertight transverse bulkheads in cargo holds

Ship's name..................... IMO number.......................... Class Identity No………………. Report No………………
LOCATION OF STRUCTURE: FRAME NO.:
STRUCTURAL COMPONENT (PLATING/STIFFENER)  
  Original thickness Max. allow. dimin. Gauged Diminution P Diminution S
mm mm P S mm % mm %
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
Operator's signature…………………………......... Notes – see following page

 Notes to report TM5-DSBC:

1 This report should be used for recording the thickness measurement of watertight transverse bulkheads in cargo holds.

  2 Guidance for areas of measurements is indicated in appendix 3.

  3 The single measurements recorded should represent the average of multiple measurements.

  4 The maximum allowable diminution could be stated in an attached document.

 TM6-DSBC

Report on thickness measurement of miscellaneous structural members

Ship's name..................... IMO number.......................... Class Identity No………………. Report No………………    
STRUCTURAL MEMBER: SKETCH
LOCATION OF STRUCTURE:  
DESCRIPTION Orig. thk. Max. allow. dimin. Gauged Diminution P Diminution S
mm mm P S mm % mm %
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
Operator's signature…………………………......... Notes – see following page  

 Notes to report TM6-DSBC:

1 This report should be used for recording the thickness measurement of miscellaneous structural members including structural items (28) and others for instance deck plating between hatches, hatch covers as shown on diagrams of typical transverse sections (appendix 3).

  2 Guidance for areas of measurements is indicated in appendix 3.

  3 The single measurements recorded should represent the average of multiple measurements.

  4 The maximum allowable diminution could be stated in an attached document.

Appendix 3 - Guidance on Thickness Measurement – Double-Side Skin Construction Ships not Built Under IACS CSR

Typical transverse section indicating longitudinal and transverse members (Double-side skin bulk carrier)

Typical transverse section indicating longitudinal and transverse members (Ore carriers)

Transverse section outline (Double-side skin bulk carriers and ore carriers)

The diagram may be used for those ships where the typical transverse sections are not suitable.

Close-up survey and thickness measurements areas Double-side skin bulk carriers

 Areas subject to close-up survey and thickness measurements – areas (A) to (E) as defined in annex 1 of part B – The thickness measurements should be reported on TM3-DSBC, TM4-DSBC, TM5-DSBC and TM6-DSBC as appropriate.

Ore carriers

 Areas subject to close-up survey and thickness measurements – areas (A), (C), (D) and (E) as defined in annex 1 of part B – The thickness measurements should be reported on TM3-DSBC, TM4-DSBC, TM5-DSBC and TM6-DSBC as appropriate

Typical areas of deck plating and underdeck structure inside the line of hatch openings between cargo hold hatches

Framing in double-side tanks
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