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- 1 ton a/c = 12,000 BTU per hour - 1 Boiler HP = 42,000 BTU input - 100 Boiler HP = 42 therm Input - 100 lb Steam = 1 therm (approx.) - 1 Engine HP = 10,000 BTU input (approx.) - 1 British Thermal Unit = Energy required to raise the temperature of 1 lb. Mass of water by 1°F - 1 SCF natural gas = 1,000 BTU (approx.) - 100 SCF natural gas = 1 therm (approx.) - 1 MSCF natural gas = 1,000 scf - 1 MSCF = 10 therm - 1 Therm = 29.3 kilowatt hr - Standard Cubic Foot = Volume of gas at standard conditions - Standard conditions = 60°F @ 14.73 psia - SCFH = Volume flow rate per hour @ standard conditions - Degrees Rankin = Degrees F + 459.67° Abbreviations - ACSH - actual cubic feet per hour - ACFM - actual cubic feet per minute - BTU - British thermal unit - MSCF - (thousand) standard cubic feet - N.O. - Normally open - N.C. - Normally closed - PSI - pounds per square inch - PSIA - pounds per square inch absolute - PSIG - pounds per square inch gauge - SCFH - Standard cubic feet per hour - "w.c. - inches of water column - G - Gravity - H - Pressure drop - Q - Flow - T - Temperature - W - Flow rate |
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