International & national standards for gas flow

International & National Standards for flow measurement

Gases

Nidhin manohar

Differential pressure flow meters ISO 5167 – 1 :

2003 Measurement of

fluid flow by means of pressure differential devices inserted in circular cross section running full – Part 1.

General principles and requirements

This part of ISO 5167 defines terms and symbols and establishes the general principles for methods of measurement and computation of the flow rate of fluid flowing in a conduit by means of pressure differential devices (orifice, nozzle& venturi) when they are inserted in a circular cross section conduit running full. This part also specifies the general requirements for methods of measurement, installation and determination of uncertainty of the measurement of flow rate.

Differential pressure flow meters ISO 5167 – 2 : 2003 Measurement of fluid

flow by means of pressure differential devices inserted in circular cross section running full – Part 2.

Orifice plates

This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) of orifice plates when they are inserted in a conduit running full to determine the flow rate of the fluid flowing in the conduit.

This part also provides background information for calculating the flow rate and is applicable in conjunction with the requirements given in ISO 5167 - 1



Orifice plates

This part of ISO 5167 is applicable only to a flow which remains subsonic throughout the measuring section and were the fluid can be considered as single phase. It is not applicable to the measurement of pulsating flow. It does not cover the use of orifice plates in pipe sizes less than 50 mm or more than 1000 mm or pipe Reynolds number below 5000.



Nozzles and Venturi nozzles

This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) of nozzles and venturi nozzles when they are inserted in a conduit running full to determine the flow rate of the fluid flowing in the conduit.

This part also provides background information for calculating the flow rate and is applicable in conjunction with requirements given in ISO 5167-1.




This part of ISO 5167 is applicable only to a flow which remains subsonic throughout the measuring section and were the fluid can be considered as single phase. It is not applicable to the measurement of pulsating flow. It does not cover the use of nozzles and venturi nozzles in pipe sizes less than 50 mm or more than 630 mm or pipe Reynolds number below 10000.




This part of ISO 5167 deals with

1. Standard nozzlesa) ISA nozzle

1932 nozzleb) Long radius nozzle2. Venturi nozzles

The ISA and 1932 nozzles are fundamentally different and are described separately in this part of ISO 5167.



Venturi tubes

This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) of nozzles and venturi nozzles when they are inserted in a conduit running full to determine the flow rate of the fluid flowing in the conduit.

This part also provides background information for calculating the flow rate and is applicable in conjunction with requirements given in ISO 5167-1.



Venturi tubes

This part of ISO 5167 is applicable only to a flow which remains subsonic throughout the measuring section and were the fluid can be considered as single phase. It is not applicable to the measurement of pulsating flow. It does not cover the use of nozzles and venturi nozzles in pipe sizes less than 50 mm or more than 1200 mm or pipe Reynolds number below 200000.



Venturi tubes

This part of ISO 5167 deals with

1. Classical venturi tubesa) Castb) Machinedc) Rough welded sheet-iron

Differential pressure flow meters

(Other types) IS 10431 : 1994 Measurement of air

flow of compressors and exhausters by nozzles.

This standard prescribes a method of measurement of air flow and free air delivery of positive displacement compressors and exhausters, both reciprocating and rotary types.

This standard deals with measurement of air flow by using standard flow nozzle in order to obtain consistent and generally acceptable results, within a specified tolerance.


(Other types) IS 10431 : 1994 Measurement of air

flow of compressors and exhausters by nozzles.

This standard does not deals with the compressors giving a pressure rise of less than 0.1 bar and greater than 60 bar.


(Other types) BS 1571 – 2 : 1975 Testing of positive

displacement compressors and exhausters.

This standard specifies acceptance tests for positive displacement compressors and exhausters, the absolute intake pressures of which exceed approximately 1 mbar.

This standard applies to such machines as reciprocating and rotary compressors.


(Other types) ASTM D 3195 :

1985.Standard practice for

Rotameter Calibration

This standard covers the calibration of variable-area flow meters (rotameters) used to determine air sample volumes at or close to ambient conditions of pressure and temperature, in the analysis of atmospheres for pollutant content.

This standard does not purport to address all of the safety problems associated with its use.


(Other types) ISO 9300 : 2005.Measurement of gas flow

by means of critical flow venturi nozzles.

This standard specifies the geometry and method of use (installation and operating conditions) of critical flow venturi nozzles (CFVN) used to determine the mass flow rate of the fluid flowing a system. It also gives the information necessary for calculating the flow rate and its associated uncertainty.

Rotary meters

ISO 9951 : 1993.Measurement of gas flow

in closed conduits – Turbine meters.

This standard specifies dimensions, ranges, construction, performance, calibration and output characteristics of turbine meters for gas flow measurement.

It also deals with installation conditions, leakage testing and pressure testing and provides a series of informative annexes A to E including recommendations for use, field checks and perturbations of the fluid flowing.

Rotary meters

AGA Report No. 7 : 1985.

Measurement of gas by Turbine meters.

This report and recommendations relate and are limited to the axial flow type gas turbine meter in which the entire gas system passes through the turbine meter rotor.

It covers the measurement of fuel gas by turbine meters as related to the installation, operation, calibration practices and calculation methods for determining volumetric and mass flow.

Rotary meters


Measurement of gas by Turbine meters.

This report does not cover the equipment used in the determination of the pressures, temperatures, densities and other variables that must be known for the accurate measurement of gas.

Rotary meters

OIML TC8/SC8 : 2005.Gas meters – Part 1

Requirements.(Supersedes documents :

R6, R31, R32)

This documents applies to gas meters based on any principle, used to meter the quantity of gas in volume, mass or energy units that has passed the meter at operating conditions.

It also applies to correction, other ancillary and electronic devices that can be attached to the gas meter.

Rotary meters



R6, R31, R32)

This also applies to gas meters intended to measure quantities of gaseous fuels or other gases except liquefied gases and steam.

Dispensers for compressed natural gas (CNG) are excluded from the scope of this recommendation.

Ultrasonic meters



R6, R31, R32)

This documents applies to gas meters based on any principle, used to meter the quantity of gas in volume, mass or energy units that has passed the meter at operating conditions.

It also applies to correction, other ancillary and electronic devices that can be attached to the gas meter.

Ultrasonic meters



R6, R31, R32)

This also applies to gas meters intended to measure quantities of gaseous fuels or other gases except liquefied gases and steam.

Dispensers for compressed natural gas (CNG) are excluded from the scope of this recommendation.

Ultrasonic meters


Measurement of gas by Multipath Ultrasonic meters.

This report developed for multipath ultrasonic transit-time flow meters, typically 6” and larger in diameter, used for the measurement of natural gas. Ultrasonic meters have at least two independent pairs of measuring transducers.

Typical applications include measuring the flow of large volumes of gas through production facilities, transmission pipelines, storage facilities, distribution systems and large end use customer meter set.

Fluid oscillatory meters

OIML D 25 : 1996.Vortex meters used in

measuring systems for fluids.

This document describes the general metrological characteristics and performances attainable by measuring systems for fluids fitted with vortex meters and specifies the installation and testing conditions which should be fulfilled for these performances to be actually obtained.

Safety matters are not subject to metrological control and are therefore not dealt with in this document.

Fluid oscillatory meters

JIS Z 8766 : 1989.Methods of flow

measurement by vortex flow meters.

This standard specifies methods of flow measurement for fluids in pipes running full by means of vortex flow meters.

Mass flow meters


Measurement of Natural gas by Coriolis meter.

This report is to assist designers and users in operating, installing, maintaining and verifying Coriolis flow meters used for Natural gas flow measurement.

The scope is limited to the measurement of natural gas and associated hydrocarbon gases either as pure hydrocarbons, as a mixture and diluents..

Applies to meters used in medium to high pressure gas applications.

Safety Relief Valves

IS 12992 - 2 : 1990.Spring loaded safety relief

valves – Specifications(Part 2 Testing)

This standard covers the test to establish the operatability of safety relief valves at specified pressure and temperature.

Safety Relief Valves

ASME PTC 25 : 2001.Pressure relief devices

This code provides instruction for flow capacity testing and for in-service and bench testing. Testing of re-closing is conducted under various inlet and outlet conditions using steam and gases for which valid physical properties are known.

Air Relief Valves

IS 14845 : 2000.Resilient seated cast iron

air relief valves for water works purpose – Specification.

This standard covers requirement of single air valve (small and large orifice) double air valve (small and large orifice with or without integral isolating valve) and kinetic air valves with or without separate isolating sluice valve for use on water mains.

Uncertainty estimation

NABL 141 : 2000.Guidelines for estimation

and expression of uncertainty in measurement

This document apply to measurement of all sorts as are carried out in calibration laboratories. For specialized measurements, these may have to be supplemented by more specific details and, in some cases, appropriately modified forms of the concerned formulae. Measurements which can be treated as outputs of several correlated inputs have been excluded from the scope of this document.

Education

International & national standards for gas flow