Morrell E.,Mesa Laboratories
16th International Flow Measurement Conference 2013, FLOMEKO 2013 | Year: 2013
The interconnections and procedures followed when using gas flow measurement instruments are critical to obtaining accurate flow measurements. Errors can be introduced from; interactions between flow sources and flow measurement instruments, interconnecting plumbing, thermal instabilities and pressure variations. The introduced uncertainties can be especially large when measuring gas flow in situ at industrial installations. Many end users have little knowledge or appreciation for these effects and as a result measurement errors are often introduced in gas flow measurements. In this paper, we report and quantify measurement errors when using a positive displacement piston prover to calibrate gas flow in industrial installations. When flow measurements are taken, a temperature change or dynamic pressure change in the gas volume (connecting volume) between a flow source and the calibration instrument will cause a measurement error. We have previously studied typical well defined connecting volume errors in laboratory settings. Our field experience with industrial applications has found that connecting volume is often larger and more complex than the simplistic models previously investigated. Plumbing interconnections between a flow source and a flow measurement instrument in industrial applications often is a complex network of undefined volumes. We present the resulting uncertainty of gas flow measured with large connecting volumes similar to installations we have observed in industrial settings. Copyright© (2013) by the International Measurement Federation (IMEKO). Source
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