2 Renewal Survey
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 B - Guidelines on the Enhanced Programme of Inspection During Surveys for Oil Tankers - Part B - Guidelines on the Enhanced Programme of Inspections During Surveys of Oil Tankers other than Double Hull Oil Tankers - 2 Renewal Survey

2 Renewal Survey

2.1 General

  2.1.1 The enhanced survey may be commenced at the fourth annual survey and be progressed during the succeeding year with a view to completion by the fifth anniversary date.

  2.1.2 As part of the preparation for the enhanced survey, the survey programme should be dealt with, in advance of the enhanced survey. The thickness measurement should not be held before the fourth annual survey.

  2.1.3 The survey should include, in addition to the requirements of the annual survey, examination, tests and checks of sufficient extent to ensure that the hull and related piping, as required in 2.1.5, is in a satisfactory condition and is fit for its intended purpose for the new period of validity of the Cargo Ship Safety Construction Certificate, subject to proper maintenance and operation and to the renewal surveys being carried out.

  2.1.4 All cargo tanks, ballast tanks, pump rooms, pipe tunnels, cofferdams and void spaces bounding cargo tanks, decks and outer hull should be examined, and this examination should be supplemented by thickness measurement and testing deemed necessary, to ensure that the structural integrity remains effective. The examination should be sufficient to discover substantial corrosion, significant deformation, fractures, damages or other structural deterioration.

  2.1.5 Cargo piping on deck, including crude oil washing (COW) piping, and cargo and ballast piping within the above tanks and spaces should be examined and operationally tested to working pressure to attending surveyors satisfaction to ensure that tightness and condition remain satisfactory. Special attention should be given to any ballast piping in cargo tanks and cargo piping in ballast tanks and void spaces, and surveyors should be advised on all occasions when this piping, including valves and fittings, are open during repair periods and can be examined internally.

  2.1.6 The survey extent of combined ballast/cargo tanks should be evaluated based on the records of ballast history and extent of the corrosion prevention system provided.

2.2 Dry-dock Survey

  2.2.1 A survey in dry-dock should be a part of the enhanced survey during renewal survey. There should be a minimum of two inspections of the outside of the ship's bottom during the 5-year period of the Cargo Ship Safety Construction certificate. In all cases, the maximum interval between bottom inspections should not exceed 36 months.

  2.2.2 For ships of 15 years of age and over, inspection of the outside of the ship's bottom should be carried out with the ship in dry dock. For ships of less than 15 years of age, alternate inspections of the ship's bottom not conducted in conjunction with the renewal survey may be carried out with the ship afloat. Inspection of the ship afloat should only be carried out when the conditions are satisfactory and the proper equipment and suitably qualified staff are available.

  2.2.3 If a survey in dry-dock is not completed in conjunction with the enhanced survey during renewal survey or if the 36 month maximum interval referred to in 2.2.1 is not complied with, the Cargo Ship Safety Construction Certificate should cease to be valid until a survey in dry dock is completed.

2.3 Tank Corrosion Prevention System

  2.3.1 Where provided, the condition of the corrosion prevention system of cargo tanks should be examined. A ballast tank where a protective coating is found in POOR condition and it is not renewed, or where soft coating has been applied, or where a protective coating has not been applied from the time of construction, the tank in question should be examined at annual intervals. Thickness measurements should be carried out as deemed necessary by the surveyor.

2.4 Extent of Overall And Close-up Surveys

  2.4.1 An overall survey of all integral tanks and spaces should be carried out at the enhanced survey carried out during renewal survey.

  2.4.2 The requirements for close-up surveys at the enhanced survey carried out during renewal survey are given in annex 1.

  2.4.3 The surveyor may extend the scope of the close-up survey as deemed necessary taking into account the maintenance of the tanks under survey, the condition of the corrosion prevention system and also in the following cases:

  • .1 in particular, tanks having structural arrangements or details which have suffered defects in similar tanks or on similar ships according to available information;

  • .2 in tanks which have structures with reduced scantlings in association with a corrosion prevention system approved by the Administration.

  2.4.4 For areas in tanks where coatings are found to be in GOOD condition as defined in 1.2.9, the extent of close-up surveys according to annex 1 may be specially considered by the Administration.

2.5 Extent of Thickness Measurements

  2.5.1 The requirements for thickness measurements at the renewal survey are given in annex 2.

  2.5.2 Where substantial corrosion as defined in 1.2.7 is found the extent of thickness measurements should be increased in accordance with the requirements of annex 4.

  2.5.3 The surveyor may extend the thickness measurements as deemed necessary.

  2.5.4 For areas in tanks where coatings are found to be in GOOD condition as defined 1.2.9, the extent of thickness measurements according to annex 2 may be specially considered by the Administration.

  2.5.5 Transverse sections should be chosen where the largest reductions are suspected to occur or are revealed from deck plating measurements.

  2.5.6 In cases where two or three sections should be measured, at least one should include a ballast tank within 0.5L amidships.

2.6 Extent of Tank Pressure Testing

  2.6.1 The requirements for tank pressure testing at the renewal survey are given in annex 3.

  2.6.2 The surveyor may extend the tank pressure testing as deemed necessary.

  2.6.3 Generally, the pressure should correspond to a water level to the top of access hatches for cargo tanks, or top of air pipes for ballast tanks.


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