2 Sampling method of thickness measurement
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.1055 – Guidelines on the Sampling Method of Thickness Measurements for Longitudinal Strength Evaluation and Repair Methods in Accordance with Annex 12 to Annex B to Resolution A.744(18), as Amended – (Adopted on 23 December 2002) - Annex - Guidelines on the Sampling Method of Thickness Measurements for Longitudinal Strength Evaluation and Repair Methods in Accordance with Annex 12 To Annex B to Resolution A.744(18), as Amended - 2 Sampling method of thickness measurement

2 Sampling method of thickness measurement

  2.1 Pursuant to the requirements of section 2.5 of Annex B to resolution A.744(18), as amended, transverse sections should be chosen such that thickness measurements can be taken for as many different tanks in corrosive environments as possible, e.g. ballast tanks sharing a common plane boundary with cargo tanks fitted with heating coils, other ballast tanks, cargo tanks permitted to be filled with sea water and other cargo tanks. Ballast tanks sharing a common plane boundary with cargo tanks fitted with heating coils and cargo tanks permitted to be filled with sea water should be selected where present.

  2.2 The minimum number of transverse sections to be sampled should be in accordance with annex 2 to Annex B to resolution A.744(18), as amended. The transverse sections should be located where the largest thickness reductions are suspected to occur or are revealed from deck and bottom plating measurements prescribed in 2.3 and should be clear of areas which have been locally renewed or reinforced.

  2.3 At least two points should be measured on each deck plate and/or bottom shell plate required to be measured within the cargo area in accordance with the requirements of annex 2 to Annex B to resolution A.744(18), as amended.

  2.4 Within 0.1D (where D is the ship's depth) of the deck and bottom at each transverse section to be measured in accordance with the requirements of annex 2 to Annex B to resolution A.744(18), as amended, every longitudinal and girder should be measured on the web and face plate, and every plate should be measured at one point between longitudinals.

  2.5 For longitudinal members other than those specified in 2.4 to be measured at each transverse section in accordance with the requirements of annex 2 to Annex B to resolution A.744(18), as amended, every longitudinal and girder should be measured on the web and face plate, and every plate should be measured at least in one point per strake.

  2.6 The thickness of each component should be determined by averaging all of the measurements taken in way of the transverse section on each component.

Parent topic: Annex - Guidelines on the Sampling Method of Thickness Measurements for Longitudinal Strength Evaluation and Repair Methods in Accordance with Annex 12 To Annex B to Resolution A.744(18), as Amended
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