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Read carefully and be advised to have a certified gas detection survey. Your certificate will be of value for three years provided by the HISWA rules.
Due to the continuing use of LPG systems on smaller cargo ships, fishing vessels, pleasure craft and other marine craft the Department of the Marine & Natural Resources wishes to draw attention to the dangers, which may accompany their use.
The dangers associated with LPG systems when handled incorrectly include fire, explosion, burns and asphyxiation due to gas leakage from the system or accumulation of gas following flame failure in an appliance. Such incidents have caused loss of life and material damage. To help prevent accidents with LPG systems such systems should be installed in accordance with the International Standard ISO 10239:2000.
ISO 10239:2014 covers the installation of permanently installed liquefied petroleum gas LPG systems and LPG burning appliances on small craft of up to 24 m length of hull.
It does not cover devices used for LPG-fuelled propulsion engines or LPG-driven generators.
It covers cooking appliances with internal LPG cartridges, with a capacity of 225 g or less (See Annex D).
It covers storage of all LPG cylinders but is not intended to regulate the technical requirements for such cylinders that are subject to national regulations
As with any open flame type appliance there is risk of asphyxiation due to oxygen depletion of the atmosphere and carbon monoxide poisoning where an open flame appliance is operated in an area with inadequate ventilation or where the flame is incorrect.
It is dangerous to sleep in spaces where open flame type appliances are operated and heaters without flues should not be sited in sleeping quarters, adjoining spaces or in any unventilated spaces.
The use of open flame heaters and LPG refrigerators with non-enclosed burners is not in accordance with ISO 10239:2000
LPG is supplied in pressurized cylinders and is usually propane, butane or a mixture of the two gases. Cylinders must be clearly marked with their contents. LPG has a stenching agent added to enable the presence of gas to be detected by smell even when its concentration in air is below its lower explosive limit. Butane systems operate at final pressure of 28 mbar and propane systems at 37 mbar. Appliances should be checked to verify which gas they consume. Natural gas appliances are not suitable for use with LPG.
Propane cylinders are to be stored outside in a cylinder housing whilst butane cylinders may be located in a cylinder housing or a cylinder locker. All cylinders must be stored and used upright. LPG systems draw off the vapor phase of the gas from the top of the cylinder whilst the liquid phase remains in the bottom of the cylinder.
LPG is heavier than air and any leakage will tend to fall to the bottom of a compartment. Gas may travel some distance like this and will form an explosive mixture with the air in the compartment. A spark as small as the static discharge from clothing may ignite such a mixture.
In conjunction with any LPG system the provision of an automatic gas detection and alarm system of a reliable type is strongly recommended and is required when an LPG appliance is installed in spaces below decks. It is essential that any electrical equipment associated with the gas detection and alarm system is certified as flame proof or intrinsically safe for the gas being used.
All LPG systems should be installed at least in accordance with the International Standard ISO 10239:2000 and with the appendix to this Marine Notice, which includes the main points of ISO 10239:2000.
The Department of the Marine & Natural Resources wishes to stress the importance of obtaining expert advice regarding the installation of LPG systems. The Department of the Marine & Natural Resources recommends that an inspection and test of such systems and associated alarm systems be carried out at least monthly to ensure their correct operation.
Do not take any risk. Call you HISWA certified yacht expert to inspect your gas installation.