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Installation & Operation Manual
LIQUID PETROLEUM GAS
General Information
WHAT IS LIQUID PETROLEUM GAS?
Liquefied petroleum gas or liquid petroleum gas – (LPG), are constituents of propane and
butane, both flammable hydrocarbon fuel gases used for heating, cooking and vehicles
It is;
Obtained during the processing of crude oil, or direct from the sea;
Colourless and odourless. An odourising agent is added before distribution;
Half as heavy as water when in liquid form. It will float on water before vaporising.
Easily liquefied by pressure, taking up only around 1/250th of its gaseous volume. This means
that a large amount of LPG can be stored in a small place.
Either commercial butane or commercial propane - similar in use but propane has a lower
boiling point and hence a higher storage pressure. Commercial propane is predominantly
an outdoor fuel, commercial butane is predominantly an indoor fuel.
HOW IS LPG COMMONLY USED?
LPG is used in your home, including cooking, heating, hot water, autogas, aerosol propellant,
air-conditioning refrigerant and back-up generator applications. LPG used in your home is
typically supplied in 45kg LPG gas bottles and commonly used for BBQ's and camping.
Business and industry use LPG fuel for a multitude of processes including steam boilers, kilns,
ovens and LPG forklifts.
WHAT ARE THE HAZARDS OF LPG?
LPG is approximately twice as heavy as air when in gas form and will tend to sink to the
lowest possible level and may accumulate in cellars, pits, drains etc.
LPG in liquid form can cause severe cold burns to the skin owing to its rapid vaporisation.
Vaporisation can cool equipment so that it may be cold enough to cause cold burns.
LPG forms a flammable mixture with air in concentrations of between 2% and 10%. Your
device is designed to warn you at 0.16% concentration BV (by volume of air) and will alarm
at 0.2% BV – this is 8% & 10% of the Lower Explosive Limit (LEL).
Vapour/air mixtures arising from leakages may be ignited some distance from the point of
escape and the flame can travel back to the source of the leak.
At very high concentrations when mixed with air, vapour is an anaesthetic and can
subsequently asphyxiate by diluting the available oxygen.
A vessel that has contained LPG is nominally empty but may still contain LPG vapour and be
potentially dangerous. Therefore treat all LPG vessels as if they were full.
For more information, please visit our website or contact your local AGS distributor
Rev: 11 08-20
Mini Merlin
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