GB/T 21391-2008: Measurement of natural gas flow by turbine meter

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Scope

This standard specifies the measurement conditions, requirements,
performance, installation, real-flow calibration and field inspection of gas turbine
flow meter (hereinafter referred to as flow meter) for natural gas flow
measurement.
The natural gas component measured by the flow meter shall be within the
range specified in GB 17820-1999, GB/T 17747.1-1999, GB/T 17747.2-1999
and GB/T 17747.3-1999, AND the true relative density of natural gas is 0.55 ~
0.80.
This standard specifies that the standard reference conditions for the
measurement of natural gas flow and the combustion standard reference
conditions for the calorific value measurement are absolute pressure Pn =
0.101325 MPa and the thermodynamic temperature Tn = 293.15 K. It may also
use the contracted pressure and temperature as the reference conditions.
Unless otherwise stated, the pressure referred to in this standard is gauge
pressure.

Basic Data

Standard ID	GB/T 21391-2008 (GB/T21391-2008)
Description (Translated English)	Measurement of natural gas flow by turbine meter
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	E98
Classification of International Standard	75.180.30
Word Count Estimation	30,361
Date of Issue	2008-02-02
Date of Implementation	2008-08-01
Quoted Standard	GB 3836.1-2000; GB 3836.2-2000; GB 3836.4-2000; GB 4208; GB/T 11062-1998; GB/T 13610-2003; GB/T 15464
Adopted Standard	EN 12261-2002, NEQ
Regulation (derived from)	National Standard Approval Announcement 2008 No.2 (Total No.115)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the measurement conditions for gas flow measurement of gas turbine flowmeter, requirements, performance, installation, actual flow calibration and spot checks. Component of the measured gas flow meter shall GB 17820-1999, GB/T 17747. 1-1999, within the range of GB/T 17747. 2-1999 and GB/T 17747. 3-1999 prescribed, real gas relative density of 0. 55 to 0. 80. This standard specifies the gas volume flow measurement standard reference standard reference conditions of combustion conditions and heat measuring absolute pressure Pn are equal 0. 101325MPa and thermodynamic temperature Tn is equal to 293. 15K. Contracts can also be used as a reference pressure and temperature than the contract conditions. Pressure unless otherwise stated in this standard are referred to gauge.