Lpg specifications

Typical specification of LPG marketed by TOTALGAZ in Bangladesh

Properties Propane Butane LPG (C3:30% & C4:70%)
General
Physical state at 15°C and 1 atm Gas Gas Gas
Molecular weight (gm/mole) 44.09 58.12 51-54
Boiling Point at 1 atm ( °C) (-) 42.1 (-) 0.5 (-) 13
Freezing point (°C) (-) 187.7 (-) 138.4 (-) 153
Critical Temperature ( °C) 96.67 305.6 243
Critical Pressure ( psia) 616.25 551 570
Auto-Ignition temperature in air at 1 atm (°C) 470 500 490
Color (appearance) Colorless Colorless Colorless
Odor Odorless Odorless Odorless
Toxicity Non toxic Non toxic Non toxic
Liquid
Reid Vapor Pressure (RVP) at 15.6°C ( bars) 12 3.6 5-7
Gross Calorific Value at 15°C ( kcal/kg) 11900 11800 11830
Net Calorific Value at 15°C ( kcal/kg) 10999 10845 10896
Liquid density at 15°C ( kg/litre) 0.51 0.575 0.5550
Specific volume of liquid per Kg at 15 C (litre) 1.96 1.73 1.7990
Specific gravity of liquid at 15°C ( w.r.t water = 1) 0.51 0.575 &0.5555
Vapor
Specific density at 15 C & 1 atm ( kg/m3) 1.55 2.48 2.20
Specific Volume of Gas per kg at 15 C, 1 atm (m3) 0.5 0.38 0.42
Explosive limit ( vol% of vapor in air gas mixture) 2.4 to 9.3 1.8 to 8.8 2 to 9.5
Gross Calorific Value at 15°C, ( kcal/Nm3) 24000 30700 25226.67
Net Calorific Value at 15°C, ( kcal/Nm3) 22600 29000 10896.36
Air required for combustion m3/m3 24 30 28