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Title: Calculation Of Orifice And Displacement Meter Charts
Author: Roy S. Peace Jr.
Source: 1940 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1940
Abstract: The calculation of meter charts in the gas industry is the basic accounting of dollars and cents and these charts should be considered as promissory notes of the customers. While the routine calculation of these charts is fairly simple, the importance of the work and the necessity of being thorough should be stressed emphatically. The price of the gas metered influences most companies in the amount of care exercised in the calculation of the charts. It is food for thought that an error ot one pound in reading a 7 day positive meter chart delivering 20 M.C.F. per hour (SO lbs. delivery pressure, 23c gas) amounts to 11.96 a week, and an error of 2/10 inch of differential on a 24 hour orifice meter chart (delivering gas at 30 differential 60 lbs, pressure, 13 tubes with 7 inch orifice on pipe taps, 23c gas) amount to 16.6 per day. In our discussion we will confine ourselves strictly to the calculation of the charts, assuming the meter attendant will keep the meter functioning properly and record correct conditions within commercial practice.

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