PERFORMANCE STANDARD FOR PROTECTIVE COATINGS FOR CARGO OIL TANKS OF CRUDE OIL TANKERS

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PROTECTIVE COATINGS
FOR CARGO OIL TANKS OF CRUDE OIL TANKERS
The Coating Standard provides technical requirements for the minimum standard for protective coatings to be applied in cargo oil tanks during the construction of new crude oil tankers to avoid corrosion.Basically on new tankers to avoid corrosion we are using epoxy based systems.

To under stand the standards we have to be familiar with the coating condition.

Coating condition is defined as follows:

GOOD condition with only minor spot rusting.

FAIR condition with local breakdown of coating at edges of stiffeners and weld connections and/or light rusting over 20 per cent or more of areas under consideration, but less than as defined for POOR condition.

POOR condition with general breakdown of coating over 20 per cent or more of areas or hard scale at per cent or more of areas under consideration.

NEW TANKERS??? 

The standard applies to newly constructed crude oil tankers greater than 5,000dwt where;
  • The building contract is placed on or after 1st January 2013 or, in the absence of a building contract
  • The keels of which are laid or which are at a similar stage of construction on or after 1st July 2013
  • Or the delivery of which is on or after 1st January 2016

 Performance standard

This Standard is based on specifications and requirements to provide a target useful coating
life of 15 years, which is considered to be the time period, from initial application, over which
the coating system is intended to remain in "GOOD" condition. The actual useful life will
vary, depending on numerous variables including actual conditions encountered in service.

Area of application

The following areas are the minimum areas that shall be protected according to this Standard:

1 Deckhead with complete internal structure.

2 Longitudinal and transverse bulkheads to be coated to the uppermost means of access level.

3 On cargo tank bulkheads without an uppermost means of access the coating to extend to 10% of the tanks height at centre-line but need not
extend more than 3 m down from the deck.

4 Flat inner bottom and all structure to height of 0.3 m above inner bottom to be coated.

this can be simply shown in a figure below.


 The details of the coating to be in the Coating Technical File (CTF) ,the details of CTF will be in the next blog.

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