scope:

This report includes methods for proving gas flow meters and/or metering systems in the field using either critical flow or other transfer metering techniques. It is intended for use by both technicians and engineers to enable them to apply principles of engineering, physics, and mathematics to the process of proving, verifying, or checking a working meter or metering system by utilizing a calibrated, traceable master metering system with a documented uncertainty across the range over which the master metering system is applied.

This document is intended as an informational guide and not as a prescriptive document. It is the responsibility of those using the methods described to establish error limits, required operating test range, and other criteria for determining the acceptability of a meter proof and the situations in which these proving methods can be applied.

Purpose

The purpose of this document is to provide operating personnel with methods to prove gas flow meters in the field. The methods presented will include both current technology and previously presented technology that is still in use.