AnswerID: 199226 Submitted: Sunday, Oct 15, 2006 at 07:54
And now to really throw a spanner in the works !
What gas are you actually getting put into your bottle? LPG stands for Liquified Petroleum Gas (s). This is a mixture and could contain; methane, ethane, propane, butane and minor amounts of several other gases. If your fill has a high propane content then it will work better on a cold day and burn hotter at a lower flow rate. If the gas is nearly all butane it will not burn as hot, you will use more for the same heat output as propane so it will efectively cost you more. Don't know what the drill is everywhere but I think that you will find that the tanker driver leaves a copy of the product make-up document with each bulk delivery.
From memory you can only call it propane if the mix is actually over 80% propane. If anyone can update me on this please do.
When your tank is nearly empty and you are in a cold area then nearly all of the remaining gas will be butane as the propane fraction will have turned to gas and been used up first. It is a good idea to vent (carefully) any remaining gas out of your tank before you get it refilled. This gets rid of any remaining butane and leaves room for (hopefully) more propane when the tank is filled.
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