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IGC Code paragraph number
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Modification/Clarification
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1.1.1
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The paragraph should read as follows:
"The Code applies to ships regardless of their size,
including those of less than 500 gross tonnage, engaged in carriage of NGHPs
when carried in bulk."
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1.3.6
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The first sentence of the paragraph
should read as follows:
""Cargo area" is that part of the
ship which contains the cargo containment system and gas machinery room,
cargo handling system, cargo hold cover space and includes deck areas over
the full length and breadth of the part of the ship over the above-mentioned
spaces."
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1.3.9
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The paragraph should read as
follows:
""Cargoes" are NGHPs."
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1.3.11
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The paragraph should read as follows:
""Cargo hold" is the gas-tight shell designed to be the
primary container of the cargo and includes all such containers whether or
not associated with insulation or secondary barriers or both."
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2.6.1.2
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The following text is added at the
end of the paragraph:
""Shell plating" means outer hull
other than bulkhead deck. Therefore, a cargo hold cover may be a single skin
construction and the cargo holds may constitute the weather deck."
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2.7.2
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The paragraph should read as follows:
"Permeability of cargo space should be determined by a
competent authority."
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3.1.2
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The paragraph should read as follows:
"Where cargo is carried in a cargo containment system not
requiring a secondary barrier, segregation of hold spaces from spaces
referred to in paragraph 3.1.1 of the IGC Code or spaces either
below or outboard of the hold spaces, other than cargo hold cover space, may
be effected by cofferdams, fuel oil tanks or a single gas-tight bulkhead of
all-welded construction forming an A-60 class division. A gas-tight A-0
class division is satisfactory if there is no source of ignition or fire
hazard in the adjoining spaces (see table 3)."
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3.1.5.1
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The paragraph should read as follows:
"Any piping system and cargo handling system which may
contain cargo or dissociated gas should be segregated from other piping
systems, except where interconnections are required for cargo-related
operations such as purging, gas-freeing or inerting. Notwithstanding this
requirement, fire lines and other piping systems essential for safety need
not be segregated from such a cargo handling system. In such cases,
precautions should be taken to ensure that cargo or cargo vapour cannot
enter such other piping systems through the interconnections (see table 3)."
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3.1.5.2
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The paragraph should read as follows:
"Any piping system which may contain cargo or cargo vapour
should, except as provided in chapter 16 of the IGC Code, not pass through any accommodation
space, service space or control station or through a machinery space other
than a gas machinery room."
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3.7.4
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The paragraph should read as follows:
"Any piping in a space adjacent to a cargo hold should not
be connected to pumps in a machinery space."
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4.3
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Refer to paragraph 3.6 of these
Interim Guidelines.
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4.6
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Refer to paragraph 3.6 of these
Interim Guidelines.
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4.9
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Refer to paragraph 3.7 of these
Interim Guidelines.
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5
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Refer to paragraph 3.9 of these
Interim Guidelines.
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8.5
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The paragraph should read as follows:
"The capacity of the pressure relief valve for each cargo
hold should be determined, to the satisfaction of the Administration, based
on the anticipated dissociation rate of NGHPs, taking the following
conditions into consideration:
(1) dissociation heat of
NGHPs; (2) ambient temperature; (3) insulation of the cargo hold."
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9.1.2
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The paragraph should read as follows:
"A sufficient number of gas monitoring instruments should be
provided for each cargo hold in order to adequately monitor the progress of
purging and gas-freeing."
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11.1.2
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The paragraph should read as follows:
"All sources of ignition should be excluded from spaces
where flammable vapour may be present except as otherwise provided in chapters 10 and 16 of the IGC Code and in spaces not containing air/oxygen
maintaining positive pressure."
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11.2 to
11.4
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Fire safety systems for cargo areas
on NGHP carriers should be determined based on the properties of NGHPs and
envisaged accident scenarios, taking into account the requirements in these
paragraphs of the IGC Code.
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11.5.1
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The paragraph should read as follows:
"The gas machinery room of any ship should be provided with
a fixed fire extinguishing system at the discretion of the Administration. A
notice should be exhibited at the controls stating that the system is only
to be used for fire-extinguishing and not for inerting purposes, due to the
electrostatic ignition hazard. The alarms referred to in regulation
II-2/5.1.6 of the 1983 SOLAS amendments should be safe for use in a
flammable cargo vapour-air mixture. For the purpose of this requirement, an
extinguishing system should be provided which would be suitable for
machinery spaces. However, in the case that a carbon dioxide system is used,
the amount of carbon dioxide gas carried should be sufficient to provide a
quantity of free gas equal to 45% of the gross volume of the gas machinery
room in all cases."
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12.1.2
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The paragraph should read as follows:
"Mechanical ventilation inlets and outlets should be
arranged to ensure sufficient air movement through the space to avoid the
accumulation of flammable or toxic vapours and to ensure a safe working
environment, but in no case should the ventilation systems have total
capacity of less than 30 changes of air per hour based upon the total volume
of the space. As an exception, gas-safe cargo control rooms may have eight
changes of air per hour.
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13.1.1
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The first sentence of the paragraph
should read as follows:
"Each cargo hold should be provided
with means for indicating the pressure and temperature of the gas."
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13.5.1
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The paragraph should read as follows:
"Each cargo hold should be provided with at least one device
for indicating gas temperatures. The temperature-indicating devices should
be marked to show the lowest temperature for which the cargo hold has been
approved by the Administration."
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13.6.11
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The first sentence of the paragraph
should read as follows:
"In the case of flammable products,
where cargo containment systems other than independent tanks are used, hold
spaces, cargo hold cover space and interbarrier spaces should be provided
with a permanently installed gas detection system capable of measuring gas
concentration of 0% to 100% by volume."
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16.1.1
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The paragraph should read as follows:
"Methane (NGHP) is the cargo whose dissociated gas may be
utilized in machinery spaces of category A and in such spaces may be
utilized only in boilers, inert gas generators, combustion engines and gas
turbines."
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18.2.1
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The paragraph should read as follows:
"The master should ascertain that the quantity and
characteristics of each product to be loaded are within the limits indicated
in the Loading and Stability Information booklet (as provided for in paragraph 2.2.5 of the IGC Code)."
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