1 Ship steel protection against liquefied gas fuel (paragraph 6.3.10)
Whether a drip tray is needed or not should be decided in accordance with the
following:
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.1 when the tank is located on the open deck, drip trays should be provided to
protect the deck from leakages from tank connections and other sources of
leakage;
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.2 when the tank is located below the open deck but the tank connections are on
the open deck, drip trays should be provided to protect the deck from leakages
from tank connections and other sources of leakage; and
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.3 when the tank and the tank connections are located below the deck, all tank
connections should be located in a tank connection space. Drip trays in this
case need not be required.
2 Functional requirements applied to gas admission valves at dual fuel
engines and gas engines (sections 12.4 and 12.5)
2.1 The risk assessment, in accordance with the relevant standards on area
classification as set out in section 12.4 of part A-1 of the IGF Code, should be understood as a procedure
equivalently applicable to the examples for hazardous area zones as laid out in section
12.5 of part A-1 of the Code for the categorization of gas admission
valves at dual fuel engines and gas engines.
2.2 Section 12.4 should be interpreted as the guiding methodology
for the categorization of gas admission valves at dual fuel engines and gas engines. If
no additional safety measures and no corresponding risk assessment in accordance with
section 12.4 are available, the examples in section 12.5 should apply.
3 Hazardous area classification of fuel storage hold spaces (section 12.5.2.1 and
footnote 23)
3.1 For the purposes of hazardous area classification, fuel storage hold spaces
containing type C tanks with all potential leakage sources in a tank connection space
and having no access to any hazardous area, should be considered non-hazardous.
3.2 Where the fuel storage hold spaces include potential leakage sources, e.g. tank
connections, they should be considered hazardous area zone 1.
3.3 Where the fuel storage hold spaces include bolted access to the tank connection
space, they should be considered hazardous area zone 2.
4 Alarms for loss of ventilation capacity (section 15.10.1)
Acceptable means to confirm that the ventilation system has the "required ventilating
capacity" in operation should be, but not be limited to:
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.1 monitoring of the ventilation electric motor or fan operation combined with
underpressure indication; or
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.2 monitoring of the ventilation electric motor or fan operation combined with
ventilation flow indication; or
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.3 monitoring of ventilation flow rate to indicate that the required air flow
rate is established.