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Title: Fixed Pressure Factor Measurement-Practices Of The Industry
Author: Richard A. Sutton
Source: American Gas Association 1985
Year Published: 1985
Abstract: As the title suggests, the purpose of this paper is to present the praetiees of the industry regarding the use of fixed pressure factor measurement (FPFM). However, before proceeding further, some rationale for the use of FPFM and a review of what is involved is probably in order. FPFM, when discreetly implemented, does offer the opportunity of increased operating flexibility and at the same lime the possibility of reducing operating cosis. It allows the competitive and profitable servicing of marginal or seasonal accounts, e.g., grain dryers, greenhouses, farm taps, etc., and enables the correct measurement of distribution accounts where the required pressure to service the customer is above the normal distribution pressure. Fixed pressure factor measurement (FPFM) is not a new measurement concept but a practice that has been in use in the gas industry for over twenty years. It is a method of measuring gas at elevated pressures (above normal distribution service pressures) that requires only the use of conventional type meter indexes or conventional indexes that are specially geared. In many cases, temperature-compensated meters are used in conjunction with FPFM to correct the dial registration to base temperature conditions. The selective utilization of FPFM for accounts at elevated pressures is an alternative to the installation of a recording gauge or an integrating pressure device. Consequently, it can eliminate the eosi of either the gauge or integrating pressure device, the related maintenance, and, in the case of the recording gauge, the handling, processing, and storage of charts. An additional cost advantage offered is that a large volume measurement account processed through a companys gas measurement section may be converted to FPFM, thus reclassifying, it to a distribution account, enabling it to be read by a meter reader. A side benefit is that the scheduled testing of the meter may be lengthened to that required for a distribution service account for the particular size meter. In FPFM, a pressure multiplier, developed by using the Boyles law equation, is applied by either computer or mechanical gearing to correct the meter dial registration to basepressure conditions. The two common methods of accomplishing FPFM arc: (1) Fixed Pressure Compensating Index (FPCI) and (2) Fixed Pressure Compensation by Computer (FPCC).

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