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Class surveys periodicity and scope(hull and machinery)

  • Class renewal survey / special survey

 Class renewal surveys/special surveys are carried out at five-year intervals. However, consideration may be given by the Society, in exceptional circumstances, to granting an extension for a maximum period of three months after the due date. In such cases the next period of class will start from the due date for the previous class renewal survey before the extension was granted.

The class renewal surveys/special surveys include extensive examinations to verify that the structure, main and essential auxiliary machinery, systems and equipment of the ship are in a condition which satisfies the relevant Rules. The examinations of the hull are generally supplemented by thickness measurements and witnessing of tests as specified in the Rules, and as deemed necessary by the attending surveyor, to assess that the structural condition remains effective and to help identify substantial corrosion, significant deformation, fractures, damages or other structural deterioration.

Class survey

Annual survey

 Annual survey

 Annual surveys are to be carried out within a window from three months before to three months after each anniversary date.

At the time of annual surveys, the ship is generally examined. The survey includes an inspection of the hull, equipment and machinery of the ship and some witnessing of tests, so far as is necessary and practical in order to verify that, in the opinion of the attending surveyor(s) the ship is in a general condition which satisfies the Rule requirements.

  •  Intermediate survey

An intermediate survey is to be carried out within the window from three months before the second to three months after the third anniversary date.

The intermediate survey includes examinations and checks on the structure as specified in the Rules to verify that the vessel is in compliance with the applicable Rule requirements. The Rule criteria become more stringent with age.

 Bottom / Docking survey

 A bottom/docking survey is the examination of the outside of the ship’s hull and related items. This examination may be carried out with the ship either in dry dock (or on a slipway) or afloat: in the former case the survey will be referred to as dry-docking survey, while in the latter case as in-water survey. The conditions for acceptance of an in-water survey in lieu of a dry-docking survey will depend on the type and age of the ship and the previous history.

The outside of the ship’s hull and related items are to be examined on two occasions in the five-year period of the certificate of class with a maximum of 36 months between surveys.

Tail shatf survey

Tail shatf survey

 Tail shaft survey

 A tail shaft survey is the survey of screw shafts and tube shafts (hereafter referred to as tail shafts) and the stern bearing.

The different types of surveys to which tail shafts may be subjected and the intervals are:

 1.    Tail shaft complete survey

Tail shafts are to be submitted to complete examination at a periodicity based on the type of shaft and its design. “Complete” means that the shaft is drawn up for examination or that other equivalent means of examination are provided.

  1. 2.    Tail shaft modified survey

 A modified survey of the tail shaft is an examination which may be accepted at alternate five-yearly surveys for tail shafts provided that the shaft arrangement is in accordance with specific requirements.

  1. 3.    Tail shaft partial survey

 A partial survey allows a postponement of the complete survey, having a periodicity of 5 years, for 2.5 years.

Boiler survey

Boiler survey

Boiler surveys

 Boilers and thermal oil heaters are to be surveyed twice in every five-year period. The periodicity of the boiler survey is normally 2.5 years.

Steam boilers, super heaters and economizers are examined internally and externally. To this end, boilers are to be drained and suitably prepared for the examination of the water-steam side and the fire side. Where necessary, the external surfaces are to be made accessible for inspection by removal of insulation and lining.

Non periodical survey

Non periodical survey

  Non-periodical surveys

 Such surveys are carried out for example:

1. To update classification documents (e.g. change of owner, name of the ship, change of flag);

2. To deal with damage or suspected damage, repair or renewal work, alterations or conversion, postponement of surveys or outstanding recommendations/conditions of class;

3. at the time of port State control inspections.

In the event of damage which affects or may affect the class of the ship, the owner is to advise the Society without delay.