Annex 10 – Requirements for Extent of Thickness Measurements at Areas of Substantial Corrosion of Double-Side Skin Bulk Carriers
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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 10 – Requirements for Extent of Thickness Measurements at Areas of Substantial Corrosion of Double-Side Skin Bulk Carriers

Annex 10 – Requirements for Extent of Thickness Measurements at Areas of Substantial Corrosion of Double-Side Skin Bulk Carriers

Bottom, inner bottom and hopper structure

Structural member Extent of measurement Pattern of measurement
Bottom, inner bottom and hopper structure plating Minimum of three bays across double-bottom tank, including aft bay Measurements around and under all suction bell mouths Five-point pattern for each panel between longitudinals and floors
Bottom, inner bottom and hopper structure longitudinals Minimum of three longitudinals in each bay where bottom plating measured Three measurements in line across flange and three measurements on the vertical web
Bottom girders, including the watertight ones At fore and aft watertight floors and in centre of tanks Vertical line of single measurements on girder plating with one measurement between each panel stiffener, or a minimum of three measurements
Bottom floors, including the watertight ones Three floors in the bays where bottom plating measured, with measurements at both ends and middle Five-point pattern over 2 m2 area
Hopper structure web frame ring Three floors in bays where bottom plating measured Five-point pattern over 1 m2 of plating Single measurements on flange
Hopper structure transverse watertight bulkhead or swash bulkhead – lower ⅓ of bulkhead five-point pattern over 1 m2 of plating
– upper ⅔ of bulkhead five-point pattern over 2 m2 of plating
– stiffeners (minimum of three) For web, five-point pattern over span (two measurements across web at each end and one at centre of span). For flange, single measurements at each end and centre of span
Panel stiffening Where applicable Single measurements

Deck structure including cross strips, main cargo hatchways, hatch covers, coamings and topside tanks

Structural member Extent of measurement Pattern of measurement
Cross deck strip plating Suspect cross deck strip plating Five-point pattern between under deck stiffeners over 1 m length
Under deck stiffeners Transverse members
Longitudinal member 		Five-point pattern at each end and mid span
Five-point pattern on both web and flange
Hatch covers Side and end skirts, each three locations
Three longitudinal bands, outboard strakes (2) and centerline strake (1) 		Five-point pattern at each location
Five-point measurement each band
Hatch coamings Each side and end of coaming, one band lower ⅓, one band upper ⅔ of coaming Five-point measurement each band, i.e. end or side coaming
Topside ballast tanks Watertight transverse bulkheads:  
  – Lower ⅓ of bulkhead Five-point pattern over 1 m2 of plating
  – Upper ⅔ of bulkhead Five-point pattern over 1 m2 of plating
  – Stiffeners Five-point pattern over 1 m length
Topside ballast tanks Two representative swash
transverse bulkheads: 		 
  – Lower ⅓ of bulkhead Five-point pattern over 1 m2 of plating
  – Upper ⅔ of bulkhead Five-point pattern over 1 m2 of plating
  – Stiffeners Five-point pattern over 1 m length
Topside ballast tanks Three representative bays of slope
plating: 		 
  – Lower ⅓ of tank Five-point pattern over 1 m2 of plating
  – Upper ⅔ of tank Five-point pattern over 1 m2 of plating
Topside ballast tanks Longitudinals, suspect and adjacent Five-point pattern on both web and flange over 1 m length
Main deck plating Suspect plates and adjacent (4) Five-point pattern over 1 m2 of plating
Main deck longitudinals Suspect plates Five-point pattern on both web and flange over 1 m length
Web frames/ transverses Suspect plates Five-point pattern over 1 m2 of plating

Structure in double-side spaces of double-side skin bulk carriers including wing void spaces of ore carriers

Structural member Extent of measurement Pattern of measurement
Side shell and inner plating:        
– Upper strake and strakes in way of horizontal girders   Plating between each pair of transverse frames/longitudinals in a minimum of three bays (along the tank)   Single measurement
– All other strakes   Plating between every third pair of longitudinals in same three bays   Single measurement
Side shell and inner side transverse frames/ longitudinals on:        
– upper strake   Each transverse frame/
longitudinal in same three bays 		  Three measurements across web and one
measurement on flange
– all other strakes   Every third transverse
frame/longitudinal in same three
bays 		  Three measurements across web and one
measurement on flange
Transverse frames/ longitudinals:
– brackets 		Minimum of three at top, middle and bottom of tank in same three bays Five-point pattern over area of bracket
Vertical web and transverse bulkheads:        
– strakes in a way of horizontal girders   Minimum of two webs and both transverse bulkheads   Five-point pattern over approximately 2 m2 area
– other strakes   Minimum of two webs and both transverse bulkheads   Two measurements between each pair of vertical stiffeners
Horizontal girders Plating on each girder in a minimum of three bays Two measurements between each pair of longitudinal girder stiffeners
Panel stiffening Where applicable Single measurements

Transverse bulkheads in cargo holds

Structural member Extent of measurement Pattern of measurement
Lower stool, where fitted Transverse band within 25 mm of welded connection to inner bottom

Transverse bands within 25 mm of welded connection to shelf plate

Five-point pattern between stiffeners over 1 m length

Five-point pattern between stiffeners over 1 m length
Transverse bulkheads Transverse band at approximately mid height

Transverse band at part of bulkhead adjacent to upper deck or below upper stool shelf plate (for those ships fitted with upper stools)

Five-point pattern over 1 m2 of plating

Five-point pattern over 1 m2 of plating

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