Transcript Joint Working Group – Cargo Oil Tank Coating Performance

Development of a Cargo Oil Tank
Coating Performance Standard
Andy Alderson - Manager RINA UK
Chairman – JWG/COTCPS
Background
• Industry IACS JWG/Corrosion – Feb 2004
– Draft proposal for UR on cargo tank coating
– Put on hold pending further studies
• EMSA Expert Group on DH Tankers 2004-05
– Recommendation from the group to
development of a performance standard to
follow up a proposal to IMO.
• JWG/COTCPS Established April 2006
– First meeting 7th June 2006 Portsmouth
JWG-COTCPS members
• BIMCO
• CSNAME
• IACS
• ICS
• INTERTANKO
• KOSHIPA
• OCIMF
• SAJ
• TSCF
Development
• If coating of cargo tanks is mandated in
SOLAS, the objective is to provide the
coating performance standard.
• The standard is based on the performance
standard developed for ballast tanks.
• It is modified only to take into account the
differences between Cargo Tanks and Ballast
tanks
• It is intended as a minimum standard and
recognises that higher standards may be
applied.
Differences with Ballast Tanks
• Type of coating and compatibility with
cargoes
• Lack of experience, voluntary coating of
cargo tanks on crude oil tankers is generally
less then 5years
• Area of coating, tank tops and under deck
only
• Construction and size of tanks
Outstanding Issues
• Area of application;
– Deck head with complete internal structure,
including brackets connecting to longitudinal
and transverse bulkheads;
– Vertical plating of surrounding bulkheads
with attached structure extending 10% of the
tanks height but not more than 3 m down
from the deck with additional 100mm around
vertical brackets
– Down to and including the top of the
uppermost PMA, and toes of brackets.
Outstanding Issues
• Area of Application
– Inner bottom and vertically 1m above inner
bottom (industry) or
– Inner bottom up to the underside of the first
longitudinal stiffener but not less than 0.5m
– Inner bottom up to 0.1m
• Permanent Means of Access
– How much of this should be coated? All,
none, or only if inside the area previously
mentioned.
Outstanding Issues
• Develop Test method for Type Approval of
Coatings
– What environment ?
– Cargo specification?
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H2S content?
Inert Gas composition?
Sweating?
Temperature?
Frequency of operations
Tank cleaning effects?
Future Work Plan
• Develop test (equivalent to annex I) for type
approval of coatings
• Gather information regarding in service
experience on compatibility/incompatibility
• Agree the definition for the areas to be
coated
• Agree how to manage the PMA
• Submit a industry standard to IMO that can
be used in conjunction with the proposed EU
submission.