IMO PERFORMANCE STANDARD FOR PROTECTIVE COATING ( PSPC)

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IMO PERFORMANCE STANDARD FOR PROTECTIVE COATING ( PSPC) 
  Aim of PSPC:- Aim is to improve safety at sea by avoiding the effects of corrosion thus enhancing the structural integrity of the vessel at whole. In specific terms it involves a a target of 15 years useful coating life for ballast tanks classified as being in good condition according to definition used by IACS.
          It applies to new building and covers protection of the water ballast tanks in all type of ships of 500 GT and more as well as double side skin spaces in bulk carriers of 150 meters or more in length.
 It came in force for all ship building contracts placed on or after 1st july 2008. If no contract all keels laid from 1st July 2012. PSPC already applies to the ballast tank and double side skin spaces of tanker and bulk carriers built in accordance with common structure rules (CSR) since 8th December 2006.
      PSPC sets out requirement for improved procedures and better quality control via increased inspection requirement at all stages within the three following main areas:-
  1. Surface preparation -- ( primary and secondary), including requirements to a) profile, b) cleanliness c) shop primer.
  2. Coating application -- with requirement that include a) surface preparation in all stages b) dry film thickness c) coating advisers must have FROSIO or NACE certification.
  3. Coating quality -- it includes a) type b) pre-qualification  c) specification
Overall there are significantly increased demand for documentation of entire coating process, right from raw steel plate to the final coating system. These must be compiled into a coating technical file ( CTF), which is to be  kept on board and maintained throughout the lifetime of the ship.

Summary of specific PSPC requirement:-
A) Surface preparation --
  1. Blasting to Sa 2 and 1/2 with profile between 30-75 microns.
  2. Soluble salts< 50 mg/sq. meter
  3. Shop primer must be zinc silicate based. If not at least 70% of intact shop primer must be cleaned to Sa2
  4. No visible dust
  5. No oil contamination
B) Coating inspection -- Advisers must be certified to FROSIO( level III) or NACE( level II) . Inspection must include
  1. Surface preparation for all stages.
  2. For primary surface preparation; confirmation of the quality and thickness of shop primer
  3. Visual inspection and measurement of dry film thickness
C) Coating system --
  1. Coating must be epoxy based system
  2. Use of multicoat system that must involve contrasting colors.
  3. Top coat must be light in color to ease inspection
D) CTF must include
  1. Statement of compliance.
  2. Copy of technical data sheet
  3. Shipyard work record
  4. Procedure of inspection and repair of particular coating system.

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