Monday, Sep 06, 2010 at 12:54
There are two types of gas used for auto gas
Propane C3.H8 (molecule's of Carbon and 8 molecule's of Hydrogen)
Butane C4.H10 usually mixed 50/50 or in the colder climates less Butane.
Anybody that has used disposable gas containers on a portable stove would know that Butane does not vaporise
well in the cold hence the lower content down south.
The calorific value of Propane is 21.5mj to the litre and Butane is 22.00mj per litre so the the difference is very small.
The oil is usually some heavy ends from the refining process and ends up in the bottom of a tanker over a period of years,but for the volume transported is very small compared to years gone by.
The odour in LPG (liquefied petroleum gas)is called Mercapton and one drop will scent 1000ltrs.
The oil enters the system when non LPG resistant hoses are accidentally used in the transfer of the gas. Being petrol based it turns some of the rubber to oil.
That residue usually ends up in your gas regulator and gums it up. Very few people get their vehicle regulators checked for the life of the vehicle and the only indication of trouble is poor idling or loss of economy.
Hope this sheds some light on the subject.
40 years in the business.
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