MAPP GAS CYLINDERS
a. MAPP gas is a mixture of stabilized methylacetylene and propadiene.
b. Store liquid MAPP gas around 70°F (21°C) and under 94 psig pressure.
c. Repair any leaks immediately. MAPP gas vaporizes when the valve is opened and is difficult to detect visually. However, MAPP gas has an obnoxious odor detectable at 100 parts per million, a concentration 1/340th of its lower explosive limit in air. If repaired when detected, leaks pose little or no danger. However, if leaks are ignored, at very high concentrations (5000 parts per million and above) MAPP gas has an anesthetic effect.
d. Proper clothing must be worn to prevent injury to personnel. Once released into the open air, liquid MAPP gas boils at -36 to -4°F (-54 to -20°C). This causes frost-like burns when the gas contacts the skin.
e. MAPP gas toxicity is rated very slight, but high concentrations (5000 part per million) may have an anesthetic affect.
f. MAPP gas has some advantages in safety which should be considered when choosing a process fuel gas, including the following:
(2) MAPP gas can be used safely at the full cylinder pressure of 94 psig.
(3) Liquefied fuel is insensitive to shock.
(4) Explosive limits of MAPP gas are low compared to acetylene.
(5) Leaks can be detected easily by the strong smell of MAPP gas.
(6) MAPP cylinders are easy to handle due to their light weight.
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