Trans RINA, Vol 153, Part A4, Intl J Maritime Eng, Oct-Dec 2011
for microbes such as sulphate reducing bacteria (SRB) to establish colonies and therefore allow microbially induced corrosion to occur at areas of breakdown or damage in the coating.
Periodic examination of areas that are sheltered from the washing systems would be advisable to ensure that localised corrosion of the PMA is not occurring.
5. CONCLUSIONS
The introduction of Permanent Means of Access into ballast and cargo tanks in oil carriers allows enhanced inspection of the condition of the steel and the paintwork to take place.
It also provides good access to these areas to carry out maintenance and repair work on coatings before paint breakdown and corrosion occur. This should allow ballast tanks to remain in GOOD condition.
However, the PMA themselves also require a high level of maintenance due to their inclusion in the ships’ construction and their inclusion as part of the statutory and/or safety construction survey. International Safety Management Code
In
addition, the requires that
companies should establish procedures to ensure that the ship is maintained in conformity with the provisions of the relevant
PMA in cargo rules and regulations and that these
procedures are included in the safety management system of the ship.
spaces require checking for cargo
retention, mechanical damage and cargo induced corrosion. PMA in ballast tanks require checking to ensure that the coatings remain in good condition so as to prevent the PMA themselves becoming part of the cathodic protection system of the ballast tanks.
6. 1.
2. 3. 4.
5. REFERENCES
SOLAS Ch. II-1/Reg. 3-6 Access to and within spaces in the cargo area of oil tankers and bulk carriers
SOLAS Ch. II-1/Regulation 3-2 Corrosion Prevention in seawater Ballast Tanks
MSC1/Circ. 1330 Guidelines for maintenance and repair for protective coatings
MSC.215(82) Performance Standard of Protective Coatings (PSPC) for dedicated sea water ballast tanks in all type of ships and double-side skin spaces of bulk carriers
Peter D Contraros – “The Domino Effect Coating Breakdown – Corrosion – Structural Failure leading to Possible Design Ramifications” – Lloyds Conference, April 2003
List Corrosion 6. 7.
IACS UI SC191 Application of SOLAS Regulation II-1/3-6 (Resolution MSC.134(76) and Technical Pro9vision on PMA (Res. MSC.133(76)
ABS – 2004 Guidance for the Assessment of the Cargo Tanks 0.4L
Strength of
amidships for Oil Carriers 150m or more in length
A-246
©2011: The Royal Institution of Naval Architects
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