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Investigation into High Pressure Differential Pressure Transmitter Calibration
In many applications within the oil and gas industries, and in particular in the measurement of flow, differential pressure transmitters must operate with high accuracy and repeatability. The uncertainty of the measurement of flow varies proportionately to the uncertainty associated with the differential pressure measurement. There are many issues that arise from using differential type meters, and many of these issues are attributable to the differential pressure measurement. Issues such as turndown, linearity, repeatability, hysteresis and others are all important aspects of the differential pressure measurement.
To ensure proper differential pressure measurement the oil and gas industry currently requires differential meters to be “calibrated” in the field. Several studies have shown that there are serious issues involved with performing that calibration in the field. The overall purpose of this investigation is to determine what these issues are, and how these issues can best be addressed.
Key Results
The research consisted of two milestones, a literature review and laboratory work. The literature review covered applicable industry standards, papers, articles, and manufacturer’s specifications. The laboratory work was performed at CEESI’s test facility using five different transmitter types over a wide range of inlet pressures and temperatures.
The project’s deliverable is a final report that addresses the impact of high pressure DP calibration on measurement uncertainty, provides recommendations on proper methods of calibration, and develops a procedure for field and/or factory calibration as well as field verification of differential pressure transmitters.