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Title: Latest Proving Room Innovations
Author: Woodford A. Thomas
Source: 1967 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1967
Abstract: The standards used in the gas industry for proving are the bell prover, the low pressure flow prover, and the critical flow prover. The bell prover, being the most commonly used, and its accessories are the subject for discussion. Before proceeding to the accessories, it will be worthwhile to review briefly the operation of the bell prover itself. Figure 1 shows a cutaway of a typical prover. The dry well conserves sealing fluid while supporting the pipe through which air flows in and out of the bell. The bell furnishes the standard volume, while the counter weight can be adjusted to provide the desired proving pressure. The function of the cycloid, which is attached to the prover wheel, is to compensate for the pressure loss that is experienced as the bell descends into the sealing liquid and is INVOLUTE BALANCE WHEELSCALE BELL DRY WELL buoyed up by the liquid. Methods of calibrating the bell provers are outlined in American Meter Company Handbook E-4, Displacement Gas Meters and booklet A-l on Provers.

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