Annex 5 - Minimum Requirements for Overall and Close-Up Survey and Thickness Measurements at Intermediate Survey of Double Hull Oil Tankers
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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 B - Guidelines on the Enhanced Programme of Inspection During Surveys for Oil Tankers - Part A - Guidelines on the Enhanced Programme of Inspections During Surveys of Double Hull Oil Tankers - Annex 5 - Minimum Requirements for Overall and Close-Up Survey and Thickness Measurements at Intermediate Survey of Double Hull Oil Tankers

Annex 5 - Minimum Requirements for Overall and Close-Up Survey and Thickness Measurements at Intermediate Survey of Double Hull Oil Tankers

5<age≤10 years 10<age≤15 years Age>15 years
1 2 3
Overall survey of representative salt-water ballast tanks, selected by the attending surveyor (the selection should include fore and aft peak tanks and three other tanks) (see 4.2) Overall survey of all salt water ballast tanks, including combined cargo/ballast tanks where fitted (see 4.3) As for renewal survey given in annex 1
  Overall survey of at least two representative cargo tanks As for renewal survey given in annex 1
  Close-up survey in salt-water ballast tanks of:
  • all web frames (1) in one complete tank (see Note 1) - the knuckle area and the upper part (5 m approximately) of one web frame in each remaining ballast tank (6)
  • one transverse bulkhead (4) in each complete tank (see Note 1) (see 4.2.3)
As for renewal survey given in annex 1
  Close-up survey in two cargo tanks (or two combined cargo/ballast tanks, where fitted):
the extent of survey should be based on the records of the previous renewal survey and repair history of the tanks (see 4.3)
As for renewal survey given in annex 1
Thickness measurements of those areas found to be suspect areas, as defined in 1.2.7, at the previous renewal survey (see 4.3.5) Thickness measurements of those areas found to be suspect areas, as defined in 1.2.7, at the previous renewal survey (see 4.3.5) As for renewal survey given in annex 2
Notes :

(1), (4) and (6) are areas to be subjected to close-up surveys and thickness measurements (see appendix 3 of annex 3).

(1)Web frame means vertical web in side tank, hopper web in hopper tank, floor in double bottom tank and deck transverse in double deck tank (where fitted), including adjacent structural members. In fore and aft peak tanks web frame means a complete transverse web frame ring including adjacent structural members.

(4)Transverse bulkhead complete in ballast tanks, including girder system and adjacent structural members, such as longitudinal bulkheads, girders in double bottom tanks, inner bottom plating, hopper side, inner hull longitudinal bulkhead, connecting brackets.

(6)The knuckle area and the upper part (5 metres approximately), including adjacent structural members. Knuckle area is the area of the web frame around the connections of the slope hopper plating to the inner hull bulkhead and the inner bottom plating, up to 2 metres from the corners both on the bulkhead and the double bottom.

Note 1 Complete ballast tank: means double bottom tank plus double side tank plus double deck tank, as applicable, even if these tanks are separate.


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