Standard low-pressure measure of gas pressure, based on pressure required to lift a column of water. Household natural gas pressure is usually 7″ or 7 W.C.I. Industrial natural gas pressure may be 12″ to 15″ or more. Propane household systems usually carry 11″ of pressure, but propane kiln systems may be equipped with adjustable regulators delivering up to 20 P.S.I. (pounds per square inch). See manometerSource: Clay: A Studio Handbook

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