This project provided a proof of concept for an in-situ verification method for ultrasonic flow meters in natural gas service. The tested method consisted of simultaneously injecting helium in a minimum of two locations upstream from an ultrasonic flow meter at a known distance apart. The results from this project showed the flow verification method was successful in determining the gas velocity through an ultrasonic flow meter to within ±5%. These results indicate that the tested in-situ verification method is not accurate enough to replace a laboratory flow calibration, but could be used...
This project provided a proof of concept for an in-situ verification method for ultrasonic flow meters in natural gas service. The tested method consisted of simultaneously injecting helium in a minimum of two locations upstream from an ultrasonic flow meter at a known distance apart. The results from this project showed the flow verification method was successful in determining the gas velocity through an ultrasonic flow meter to within ±5%. These results indicate that the tested in-situ verification method is not accurate enough to replace a laboratory flow calibration, but could be used as a field diagnostic tool. The accuracy of the results and the scatter in the data were correlated to the distance between the injection points.