1 The Maritime Safety Committee, at it's sixty-ninth
session, and the Marine Environment Protection Committee, at its forty-second
session, agreed that, in accordance with the provisions of paragraph 1.4 of the IBC Code, the carriage
of styrene monomer under the conditions indicated below, should be
considered as equivalent to those identified in paragraph 15.13.5
of the IBC Code.
2 Contracting Governments to the 1974 SOLAS Convention
and Parties to MARPOL 73/78 are therefore advised that they may transport
styrene monomer in a chemical tanker with cargo tanks over 3,000 m3 fitted
with an IGS (Inert Gas System), provided that the oxygen content inside
those tanks is maintained between 2% and 8% and that the following
operational measures are observed:
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.1 upon completion of loading and taking of product
samples, the vapour space is checked to ensure that the oxygen level
is within acceptable limits (2% to 8%). Although levels as low as
2% are adequate, levels of oxygen between 6% and 8% are preferred;
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.2 during the voyage, the vapour space oxygen
content is monitored and recorded at least twice per day, at least
8 hours apart; and
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.3 temperature and pressure readings of the cargo
tanks are monitored and recorded at least twice per day, at least
8 hours apart.