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Title: Instrumentation And Volume Calculations For Pd And Turbine Meters
Author: C. Wayne Burrell
Source: 1991 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1991
Abstract: Natural gas distribution companies use a variety of instruments to define uncorrected varibles to achieve corrected volumes of gas that passes through PD and Turbine meters. 1. Compensated Indexes 2. Fixed Factors 3. Volume Recorders i 4. Mechanical Volume Correctors 5. Electronic Volume Correctors 6. Data Collection and Communication Generally speaking, LDCs only use compensating indexes on residential and or commercial applications where the loads are too small to justify the cost of more expensive instruments. These meters can be internally temperature compensated types and when used with a good pressure regulator metering gas at elevated pressures a pressure factor can be achieved that would be acceptable accuracy-wise. Some do not use the compensated index because there is normally a built-in error in the index. Thus, you must compensate the compensating index. Rather than do this, most just plug the factor into the billing machine and use the standard index.

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