Friday, March 24, 2017
Liquefied Petroleum Gas

Liquefied Petroleum Gas (also referred to as LPG, LP Gas) is a mixture of hydrocarbon gases predominantly Propane (C3) and Butane (C4) and is popular as a cooking fuel although it is also used as fuel in burning appliances in the UAE. It is also being used as refrigerant and as an aerosol propellant. LPG Gas has unique characteristics that make it a useful and portable fuel. At normal temperature and pressure it is a gas but in a vessel under modest pressure it becomes a liquid. Varieties of LPG bought and sold include mixes that are primarily Propane or mixes that are primarily Butane. RAK Gas supplies contain more Butane (about 60%), through it can be as low as 50%.

LPG evaporates at normal temperatures and pressures. LPG is heavier than air and thus tends to settle in low spots, such as basements. This can cause ignition or suffocation hazards if not dealt with.

LPG has a higher calorific value than natural gas and thus cannot be substituted for natural gas. In order to allow the use of the same burner controls and to provide for similar combustion characteristics, LPG can be mixed with air to produce a synthetic natural gas (SNG) that can be easily substituted. LPG/air mixing ratios average 60/40, through this is widely variable based on the gases making up the LPG. The method for determining the mixing ratios is by calculating the Wobbe index of the mix.

The international standard is EN 589.

LGP produced at our facility is extracted from the so called Cryogenic unit. Natural Gas stream while processing. Reljas has the capacity to produce 120 tons of LPG per day. It is stored in stationary tanks and is supplied through road tankers to bulk consumers.

Typical specification of the LPG supplied by RAK Gas is available separately


Propane 40 - 50% vol ASTM D-2163
Butane 50 - 60% vol ASTM D-2163
Pentane & Heavier 2.0% vol ASTM D-2163
Hydrogen Sulfide None ASTM D-5504-94
Total Sulphar 20ppm wt max ASTM D-5004-94
Copper Strip Corrosion No. 1 max ASTM D-1838
Free or Contained Water None Visual
Specific Gravity 0.545
Vapour Pressure
110-125 psig
Typical Value Gross Heating Value 2835 BTU/SCFT Not established by test
Typical Value Net Heating Valuer 2610 BTU/SCFT calculated approximate value



P.O.Box 434
Ras Al Khaimah, U.A.E.

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