Annex 10 - Requirements for Extent of Thickness Measurement at Areas of Substantial Corrosion. Periodical Survey of Bulk Carriers within the Cargo Area
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.744(18) Guidelines on the Enhanced Programme of Inspections During Surveys for Bulk Carriers and Oil Tankers (Adopted on 4 November 1993) - Annex A - Guidelines on the Enhanced Programme of Inspections During Surveys for Bulk Carriers - Part A - Guidelines on the Enhanced Programme of Inspections During Survey of Bulk Carriers Having Single-side Skin Construction - Annex 10 - Requirements for Extent of Thickness Measurement at Areas of Substantial Corrosion. Periodical Survey of Bulk Carriers within the Cargo Area

Annex 10 - Requirements for Extent of Thickness Measurement at Areas of Substantial Corrosion. Periodical Survey of Bulk Carriers within the Cargo Area

  SHELL PLATING
  STRUCTURAL MEMBER   EXTENT OF MEASUREMENT   PATTERN OF MEASUREMENT
1. Bottom and side shell Plating a. Suspect plate, plus four adjacent plates a. 5 point pattern for each panel between longitudinals
    b. See other tables for particulars on gauging in way tanks and cargo holds    
2. Bottom/side shell longitudinals Minimum of three longitudinals in way of suspect areas 3 measurements in line across web
      3 measurements on flange
  TRANSVERSE BULKHEADS IN CARGO HOLDS
  STRUCTURAL MEMBER   EXTENT OF MEASUREMENT   PATTERN OF MEASUREMENT
1. Lower Stool a. Transverse band within 25 mm of welded connection to inner bottom. a. 5 point between stiffeners over 1 metre length
    b. Transverse band within 25 mm of welded connection to shelf plate. b. Ditto
2. Transverse Bulkhead a. Transverse band at approximately mid-height a. 5 point pattern over 1 sq. metre of plating
    b. Transverse band at part of bulkhead adjacent to upper deck or below upper stool shelf plate (for those ships fitted with upper stools) b. 5 point pattern over 1 sq. metre of plating
  DECK STRUCTURE INCLUDING CROSS STRIPS, MAIN CARGO HATCHWAYS, HATCH COVERS, COAMINGS AND TOPSIDE TANKS
  STRUCTURAL MEMBER   EXTENT OF MEASUREMENT   PATTERN OF MEASUREMENT
1. Cross Deck Strip plating Suspect cross deck strip plating a. 5 point pattern between underdeck stiffeners over 1 metre length
2. Underneck Stiffeners a. Transverse members a. 5 point pattern at each end and mid-span
    b. Longitudinal member b. 5 point pattern on both web and flange
3. Hatch Covers a. Side and end skirts, each 3 locations a. 5 point pattern at each location
    b. 3 longitudinal bands, outboard strakes (2) and centreline strake (1) b. 5 point measurement each band
4. Hatch Coamings Each side and end of coaming, one band lower 1/3, one band upper 2/3 of coaming 5 point measurement each band, i.e. end or side coaming
5. Topside Water Ballast Tanks a. Watertight transverse bulkheads  
    i. lower 1/3 of bulkhead i. 5 point pattern over 1 sq. metre of plating
    ii. upper 2/3 of bulkhead ii. 5 point pattern over 1 sq. metre of plating
    iii. stiffeners iii. 5 point pattern over 1 sq. metre length
    b. 2 representatives swash transverse bulkheads    
    i. lower 1/3 of bulkhead i. 5 point pattern over 1 sq. metre of plating
    ii. upper 2/3 of bulkhead ii. 5 point pattern over 1 sq. metre of plating
    iii. stiffeners iii. 5 point pattern over 1 sq. metre length
    c. 3 representatives bays of slope plating c.  
    i. lower 1/3 of tank i. 5 point pattern over 1 sq. metre of plating
    ii. upper 2/3 of tank ii. 5 point pattern over 1 sq. metre of plating
    d. Longitudinals, suspect and adjacent d. 5 point pattern both web and flange over 1 metre length
6. Main Deck Plating Suspect plates and adjacent (4) 5 point pattern over 1 sq. metre of plating
7. Main Deck Longitudinals Minimum of 3 longitudinals where plating measured 5 point pattern on both web and flange over 1 metre length
8. Web frames/Transverses Suspect plates 5 point pattern over 1 sq. metre
  DOUBLE BOTTOM AND HOPPER STRUCTURE
  STRUCTURAL MEMBER   EXTENT OF MEASUREMENT   PATTERN OF MEASUREMENT
1. Inner/Double Bottom Plating Suspect plate plus all adjacent plates 5 point pattern for each panel between longitudinals over 1 metre length
2. Inner/Double Bottom Longitudinals Three longitudinals where plates measured +3 measurements inline across web, and 3 measurements on flange
3. Longitudinal Girders or Transverse floors b. Suspect plates b. 5 point pattern over about 1 square metre
4. Watertight Bulkheads (WT Floors) a. lower 1/3 of tank a. 5 point pattern over about 1 square metre of plating
    b. upper 2/3 of tank b. 5 point pattern alternate plates over 1 square metre of plating
5. Web Frames Suspect plate 5 point pattern over 1 sq. metre of plating
6. Bottom/side shell longitudinals Minimum of three longitudinals in way of suspect areas 3 measurements in line across web
      3 measurements on flange
  CARGO HOLDS
  STRUCTURAL MEMBER   EXTENT OF MEASUREMENT   PATTERN OF MEASUREMENT
1. Side Shell frames Suspect frame and each adjacent a. At each end and mid span: 5 point pattern of both web and flange
      b. 5 point pattern within 25 mm of welded attachment to both shell and lower slope plate

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