Question

Give the compasition of LPG & CNG

Answer 1

CNG is compressed natural gas – methane.

LPG is liquefied petroleum gas – propane.

There are many similarities between LPG and CNG, as well as some major differences…

What are the Differences between LPG vs CNG (Natural Gas)?

• LPG has a higher energy content than CNG, with 25MJ/L versus 9MJ/L, respectively.

• Storage pressure of LPG is less than 2 MPa whilst CNG is 20 – 25 MPa.

• For proper combustion, LPG requires an air to gas ratio of approximately 25:1 whilst natural gas requires a 10:1 ratio.

• LPG and natural gas appliances operate at different pressures – 2.75 kPa vs 1.1 kPa, correspondingly.

• LPG (propane) is denser than air at a relative density of 1.5219:1 vs natural gas (methane) at 0.5537:1, which is lighter than air.

• CNG cylinders have a tare weight approximately 3x heavier than comparable capacity LPG cylinders.

• LPG can be compressed into a liquid, increasing its energy density.

• LPG (propane) and natural gas (methane) have different chemical formulas: Methane is CH4. • Propane is C3H8.

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Answer 2

LPG-Liquefied petroleum gas
CNG-Compressed natural gas