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Title: Witnessing Orifice Meter Calibrtations And Field Testing
Author: Dan Willson
Source: 2004 International School of Hydrocarbon Measurement
Year Published: 2004
Abstract: Some may ask, is witnessing orifice meter calibrations and field testing still as important in this age and time as it was in the past. There have been many changes in the natural gas industry and with natural gas measurement itself over the past 15 to 20 years. Many companies, both those buying and those selling have seen mergers, acquisitions and reorganization over the past 5 to 10 years. Also technology has changed or improved making the meters more compact, user friendly and able to do more. Many companies, if not most are in the process or have already changed from dryflow to electronic measurement. While both dryflow and electronic meters are good devices for gas measurement, keep in mind that they are only the secondary devices. The meter tube and plate or ultrasonic measurement are the primary measurement devices. Whether it is the first or secondary device, all need to be in the best possible condition and in correct calibration for true and accurate natural gas measurement. With all the changes comes new problems for both the buyers and the sellers. Although there has been vast improvements with electronics, there is always, just as with the old style measurement, the mechanical, human and nature equation to figure in. So yes, witnessing calibrations and field testing is still very important.

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