Quote:
Originally Posted by Emmerich
LPG is a mixture of hydrocarbon gases, primarily propane and butane. The mixture can change depending on the season. Natural gas out of the ground is made up of various components, such as methane, butane, propane, ethane, pentane, heptanes+ and various impurities. The difference in each of these is the number of carbon and hydrogen atoms in each molecule.
My guess is a propane tank is around 100 psi, it is measured by weight rather than pressure. A natural gas line at your house is around 3-4psi. That is why it takes so long for a home CNG compressor to fill your car-the system is so low pressure and volume, it just doesn't give up enough to fill it fast.
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If you have 3-4 psi coming into you house you should call the gas company. Its to much. We measure it in inches of water column and the typical coming into a home here in NY is between 7"-10" wc. Thats less than 1/2 of a psi. I was a HVAC Tech for the last 10 yrs until my back went out 
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'83 300D 198,000mi Howard
'03 Saturn Vue CVT 75,000mi(wifeys)
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