An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
NIST Calibration Services for Gas Flow Meters: Piston Prover and Bell Prover Gas Flow Facilities
Published
Author(s)
John D. Wright, G E. Mattingly
Abstract
This document provides a description of the small and medium range gas flow calibration facilities at the National Institute of Standards and Technology (NIST), Fluid Flow Group, as reported in NIST Special Publication 250 for Test Nos. 18010C-18040C and 18050S, Flow Rate Measurements. The Fluid Flow Group can perform gas meter calibrations and special tests at flows between 3.7 x 10-5 m3/min and 1.4 m3/min (0.001 and 51 standard cubic feet per minute) using positive displacement techniques. The flow rate of gas passing through the meter under test is determined from pressure, temperature, volume, and transit time measurements of a displaced volume of gas. Two types of displacement devices are used: mercury-sealed piston provers and bell gasometers, or bell provers. This report describes the techniques used for calibrating meters and presents the uncertainty analysis associated with such calibrations.