Section 3 Intermediate Surveys – Hull and machinery requirements
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 1 Ship Structures - Part 1 Regulations - Chapter 3 Periodical Survey Regulations - Section 3 Intermediate Surveys – Hull and machinery requirements

Section 3 Intermediate Surveys – Hull and machinery requirements

Parent topic: Chapter 3 Periodical Survey Regulations

3.1 General

3.1.1 Intermediate Surveys are to be held concurrently with any relevant maintenance period wherever practicable, see Vol 1, Pt 1, Ch 3, 2.1 General 2.1.1

3.2 Hull

3.2.1 The requirements of Vol 1, Pt 1, Ch 3, 2 Annual Surveys – Hull, machinery and optional requirements are to be complied with so far as applicable.

3.2.2 For steel ships a general examination of salt water ballast tanks, compensated fuel tanks, integral sanitary tanks and bilges is to be carried out as required below. If such inspections reveal no visible structural defects then the examination may be limited to a verification that the protective coating remains in GOOD condition as defined in Vol 1, Pt 1, Ch 3, 1.5 Definitions 1.5.9. When considered necessary by the Surveyor thickness measurement of the structure is to be carried out. Where the protective coating is found to be other than in GOOD condition, and it has not been repaired, maintenance of Class will be subject to the spaces in question being internally examined and gauged as necessary at Annual Surveys.

  1. For all ships over six years of age and up to 12 years of age, representative salt-water ballast tanks, compensated fuel tanks, integral sanitary tanks and bilges are to be generally examined. Where the protective coating is found to be other than in GOOD condition, as defined in Vol 1, Pt 1, Ch 3, 1.5 Definitions 1.5.9, or other defects are found, the examination is to be extended to other spaces of the same type.

  2. For steel ships over twelve years of age all salt-water ballast tanks, compensated fuel tanks, integral sanitary tanks and bilges are to be generally examined.

3.2.3 For all ships over twelve years of age the anchors are to be partially lowered and raised using the capstan/ windlass.

3.2.4 Representative internal spaces including fore and aft peak spaces, plated masts, machinery spaces, bilges, etc. are to be generally examined. These spaces should include all suspect areas, see Vol 1, Pt 1, Ch 3, 1.5 Definitions 1.5.5

3.2.5 The Surveyor is to carry out a Close-up Survey and thickness measurement of the structure identified at the previous Special Survey as having substantial corrosion.

3.3 Machinery

3.3.1 Machinery and boiler spaces including tank tops, bilges and cofferdams, sea suctions and overboard discharges are to be generally examined.

3.3.2 Areas deemed dangerous, such as magazine spaces and spaces where low flash point oils are stored and handled and compartments adjacent to such spaces are to be examined for the following type:

  1. Defective and non-certified safe electrical equipment.

  2. Improperly installed, defective and dead-end wiring. An electrical insulation resistance test of the circuits terminating in, or passing through dangerous spaces is to be carried out.

3.3.3 Electrical generators are to be examined under working conditions to verify compliance with Vol 2, Pt 10, Ch 1, 3 Performance requirements.

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