Because LPG produces more energy than CNG, it cannot simply be substituted for natural gas. Only gases that have the same Wobbe index are interchangeable. For LPG to have the same Wobbe index as CNG, it has to be mixed with air. A 60:40 ratio for LPG:air mixing is common but it depends upon the composition of LPG because LPG itself is a mixture of propane and butane. This mixture of LPG and air to substitute natural gas is called synthetic natural gas (SNG). Use of SNG is common before the CNG distribution network is fully operational.
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Today's Featured Article - Talk of the Town: Winterizin Engines - To Drain or Not to Drain? - by Staff. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "Winter is fast approaching..for a gas tractor should the gas tank be drained and run the engine til the carb is dry or do the gas stabilizer products I've heard of work? (tractor will not be used til spring) any other tips for winterizing?? "
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