Email Document Reference

Enter your email address below and the reference for this document will be sent to shortly from webmaster@ceesi.com.

Title: The Nova Meter Prover
Author: I.D. Williamson, B.D. Sawchuk, U. Karnik
Source: 1995 International Symposium on Fluid Flow Measurement
Year Published: 1995
Abstract: The NOVA natural gas meter prover consists of 24 identical sonic nozzles, one of which is diverted to a weigh tank to determine the mass flow rate for that nozzle. The total flow is the measured mass flow multiplied by the number of nozzles in operation. The on-line calibration of a single nozzle avoids the use of the critical flow factor, C*, thereby improving system uncertainty. Uncertainty calculations are presented which show that the uncertainty in the total mass flow rate is between 0.13% and 0.16%, depending on the number of nozzles in operation. Uncertainty of the nozzle bank alone is virtually independent of the number of nozzles open and is between 0.44% and 0.25% depending on how the uncertainty for C* is treated. Use of correlated variables to reduce the uncertainty is addressed. One nozzle from the meter prover was calibrated in air by CEESI. This C* was on average only 0.01% higher than the C* from the NOVA meter prover, with a standard deviation of 0 06% These results also indicate that C may be more accurate than previously thought, however more work is required in this area.

In order to prevent spam and automated file downloads for documents within the Measurement Library, please follow the instructions below and then you will be able to email a reference to this article.