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Title: Fundamental Principles Of Orifice Meters
Author: A. E. Benson
Source: 1940 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1940
Abstract: Mr. Chairman, Gentlemen Before going into the subject of orifice meter mcusurcment, let us go over some of the terms used and the laws upon which orifice meter measurement is based. Atmospheric presmre.-Atmospheric pressure is the jressure of the atmosphere above an absolute vacuum. It is measured by a barometer. Cage cr line pressure.-Gage or line pressure is the pressure above atmospheric pressure and is measured by an ordinary pressure gage. The pressure gage on a gas main measures the difference in pressure between the gas in the main and atmospheric pressure, or pressure on the outside of the main. Absolute pressure.-Absolute pressure is the pressure above a perfect vacuum. In our work it is equal to gage or Une pres.sure plus atmospheric pressure or barometric pressure. Differential pressure.-Differential pressure is the difference between two pressures. The differential pressure across an orifice or any device in a gas line is the difference between the pressure before the gas passes through the orifice or device, and the pressure after it has passed through the device. Absolute iemperalure.-.bsolute temperature is the tcmrierature above absolute zero. In our work, absolute temperature is 460 degrees plus the reading of an ordinarj Fahrenheit thermometer.

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