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Performance Standard for Protective Coatings for dedicated seawater ballast tanks in all types of ships and double-side skin spaces of Bulk Carriers – issued 19 March 2007

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This report contains DNV’s overall interpretation of the consequences of the many new statutory requirements impacting the shipping industry today. Our goal is to help our customers stay up to date, while at the same time clearly state what DNV understands to be the motivation behind the changes, and point out the most important changes.

Please note that the interpretations of the rules and regulations made by DNV and presented in this report are generic, meaning that special exceptions or novel designs are not included. To obtain information regarding such special cases, please contact DNV’s experts listed in the contact section of this report.

Please also note that different IMO member states (flag states) or regulatory bodies may interpret statutory regulations in slightly different ways. DNV cannot guarantee that other bodies will interpret the relevant rules and regulations in the same way as described in this report. DNV therefore disclaim any liability for loss or damages arising as a consequence of a differing interpretation of the rules and regulations made by any other body.

Introduction
A Performance Standard for Protective Coatings (PSPC) for dedicated seawater ballast tanks in all types of ships and double-side skin spaces of bulk carriers has been developed by IMO, providing technical requirements for new constructions.

Motivation
Improved corrosion prevention in sea­water ballast tanks in all types of ships and in doubleside skin spaces of bulk carriers as coating of them, is considered to be a safety issue.

Regulation text
The SOLAS II-1, Regulation 3-2; “Corrosion prevention of seawater ballast tanks in oil tankers and bulk carriers”, has been amended. In brief implying the following:
New title: “Performance Standard for Protective Coatings for dedicated seawater ballast tanks in all types of ships and double-side skin spaces of bulk carriers”
Amendment: All dedicated seawater ballast tanks in all types of ships of not less than 500 gross tonnage and double-side skin spaces in bulk carriers of 150 m in length and upwards shall be coated during new construction in accordance with the PSPC.

In addition, maintenance is now addressed in the above mentioned SOLAS regulation, and the effectiveness of the protective coating system shall be verified during the lifetime of a ship by the Administration or an organisation recognised by the Administration, based on the guidelines developed by the IMO. Do note that the guidelines for maintenance remain to be developed, but this work is addressed in a correspondence group established at IMO Design Equipment DE50.

Enter into force of the amendment:
For ships of 500 gross tonnage and above:
1. for which the building contract is placed on or after 1 July 2008, or
2. 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 1 January 2009, or
3. the delivery of which is on or after 1 July 2012.

Status
The SOLAS II-1, Regulation 3-2 and PSPC referred to, was adopted at MSC 82, 8th December 2006. The dates for entry into force are given above.
For vessels covered by the IACS Common Structural Rules (CSR), i.e. oil tankers and bulk carriers, the PSPC entered into force immediately after adoption by MSC 82. To support uniform implementation of the PSPC for CSR vessels, IACS have developed and issued the Procedural Requirement no. 34, see below links:

Requirements in the performance standard
The PSPC applies only to dedicated seawater ballast tanks in all types of ships and to doubleside skin spaces in bulk carriers which are constructed of steel. DNV will prepare a Class Notation to document compliance with PSPC.

The PSPC is based on a detailed specification and requirements which intend 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.

The coating application (including steel surface preparation) shall be followed up by:

1. Coating system approval: Statement of Compliance/Type Approval, issued by third party, see section 5 of the standard

2. Inspection agreement: Inspection of surface preparation and coating processes shall be agreed upon, between the ship owner, the shipyard and coating manufacturer, and shall be submitted to the Administration for review, see section 3.2 of the standard.

3. Coating inspection: To be carried out by qualified coating inspectors certified to NACE Coating Inspector Level 2/FROSIO Inspector Level III or equivalent, during coating process, to ensure compliance with the PSPC. See section 6 of the standard. Results to be included in the Coating Technical File (CTF).

4. Verification: To be carried out by the Administration or a recognised organisation, consisting of reviewing the Coating Technical File, checking the Technical Data Sheet and coating system approval, coating identification on representative containers, coating inspectors qualifications and reports. Additionally, implementation of the coating inspection requirements shall be monitored. See section 7 of the standard.

A Coating Technical File (CTF) shall be prepared and shall include specification of the coating system; record of the shipyard’s and ship owner’s coating work, detailed criteria for coating selection, job specifications, inspection, maintenance and repair. A Joint Working Group (JWG) consisting of Owners, Yards, Coating Manufacturers and Class has been established to agree upon an industry standard for implementing PSPC and will consider a common template for CTF based upon amongst other a proposal made by DNV.

Consequences for external customer
Yards:

  • Only use pre-qualified coating systems

  • Prepare Coating Technical File (CTF) including Inspection Agreement

  • Possible upgrade of production system

  • Documentation of coating inspectors’ qualifications;
    – Train/hire qualified coating inspectors

  • Increased involvement from Administrations (i.e. Class Society for Common Structural Rules vessels)
    > Construction time may increase

Owners:

  • Maintenance:
    – recorded in CTF & kept onboard
    – efficiency of coating to be verified by Administration

  • Better prepared for evaluation by oil companies, e.g. Vetting and Rate (A)

  • Cost increase - however at same time, reduced life-cycle costs and better second-hand value of vessel!
    > Increased safety

Coating manufacturers:

  • Supply pre-qualified coatings systems for water ballast tanks

Consequences for Class
Verification as per section 7 of the standard will be required by the Administration or a recognised organisation. Additionally, the Administration shall review the agreement on the procedures for inspection, and if required, participate in the agreement process. Training will be needed.

  • Reviewing; Inspection Agreement and CTF

  • Checking
    – Technical Data Sheet & coating system approval
    – coating identification on representative containers
    – coating inspectors qualifications & reports
    ■ Monitoring; Implementation of coating inspection requirements

To document compliance with PSPC, DNV will extend the COAT notations (COAT-1 and COAT-2) with a new variant named: COAT–PSPC(x). The letters in parentheses will denote different corrosion prevention systems, as follows:

(B) IMO PSPC requirements for water ballast tanks
(D) IMO PSPC requirements for double side skin spaces of bulk carriers.

As IMO develops further PSPCs, the notation will be expanded to include:

(V) IMO PSPC requirements for void spaces
(C) IMO PSPC requirements for cargo oil tanks
(M) Coating maintenance requirements

Other COAT PSPC(x) notations will be added as further standards are developed.

The class notations COAT-1 and COAT-2 will be gradually phased out following the development of new coating standards within IMO.

Contact information
MTPNO378@dnv.com Materials Technology and Pressure Equipment
Materials Technology and Pressure Equipment (MTPNO378):
Helge.Vold@dnv.com
Gisle.Hersvik@dnv.com

Class Services and New building (MTPNO870):
Sille.Grjotheim@dnv.com

Date: 2007-10-09

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