Annex 8 – Recommended Procedures for Thickness Measurements

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

2 Thickness measurement sheet forms TM1-DSBC, TM2-DSBC, TM3-DSBC, TM4-DSBC, TM5-DSBC and TM6-DSBC (appendices 2 to 5) should be used, as appropriate, for recording thickness measurements and these sheets should be bound with the cover sheet of the report of GENERAL PARTICULARS in appendix 1. The maximum allowable diminution should be stated. The maximum allowable diminution could be stated in an attached document.

3 Appendices 3 to 5 are guidance diagrams and notes relating to the reporting forms and the procedure for the thickness measurements.

Appendix 1 – Thickness Measurement Report – General Particulars

Ship's name:
IMO Number:
Administration Identification Number:
Port of registry:
Gross tonnage:
Deadweight:
Date of build:
Classification society:
Name of Company performing the thickness measurement:
Thickness measurement company certified by:
Certificate No.:
Certificate valid from: .....................................................	to .......................................................
Place of measurement:
First date of measurement:
Last date of measurement:
Renewal survey/intermediate survey^footnote due:
Details of measurement equipment:
Qualification of operator:
Report Number:
Consisting of ……...... Forms
Name of operator: ...............................................	Name of surveyor: .........................................
Signature of operator: .........................................	Signature of surveyor: ...................................
Company official stamp: .....................................	Administration official stamp: ......................

Appendix 2

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 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 are to represent the average of multiple measurements.

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

Notes to Report TM2-DSBC(i)

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

Strength deck plating and sheerstrake plating transverse sections:

One, two or three sections within the cargo length area, comprising the structural items (0), (1) and (2) as shown on the diagrams of typical transverse sections (Appendices 3 and 4).

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.

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 the structural items (3), (4), (5) and (6) as shown on the diagrams of typical transverse sections in appendices 3 and 4.

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.

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 the appropriate structural items (10) to (25) as shown on diagrams of typical transverse sections in appendices 3 and 4.

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.

Notes to Report TM4-DSBC

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

Transverse structural members, comprising the appropriate structural items (30) to (34) as shown on diagrams of typical transverse sections illustrated in appendices 3 and 4.

2 Guidance for areas of measurements is indicated in appendix 5.

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

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

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.

Notes to Report TM6-DSBC

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

Miscellaneous structural members including the structural items (40), (41) and (42) as shown on diagrams of typical transverse sections illustrated in Appendix 3.

2 Guidance for areas of measurements is indicated in appendix 5.

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 – Thickness Measurement – Double-side Skin Construction

Typical transverse section of a double skin bulk carrier with indication of longitudinal and transverse members.

Appendix 4 – Thickness Measurement – Ore Carriers

Typical transverse section of an ore carrier with indication of longitudinal and transverse members.

Appendix 5 – Thickness Measurement – Double-Side Skin Construction

Transverse section outline: the diagram may be used for those ships where the diagrams given in appendices 3 and 4 are not suitable.