UNLIMITED FREE ACCESS TO THE WORLD'S BEST IDEAS

SUBMIT
Already a GlobalSpec user? Log in.

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

Customize Your GlobalSpec Experience

Finish!
Privacy Policy

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

- Trained on our vast library of engineering resources.

CEN - EN ISO 9300

Measurement of gas flow by means of critical flow nozzles

active, Most Current
Organization: CEN
Publication Date: 1 June 2022
Status: active
Page Count: 132
ICS Code (Flow in closed conduits): 17.120.10
scope:

This document specifies the geometry and method of use (installation in a system and operating conditions) of critical flow nozzles (CFNs) used to determine the mass flow rate of a gas flowing through a system basically without the need to calibrate the CFN. It also gives the information necessary for calculating the flow rate and its associated uncertainty.

This document is applicable to nozzles in which the gas flow accelerates to the critical velocity at the minimum flowing section, and only where there is steady flow of single-phase gas. When the critical velocity is attained in the nozzle, the mass flow rate of the gas flowing through the nozzle is the maximum possible for the existing inlet condition, while the CFN can only be used within specified limits, e.g. the CFN throat to inlet diameter ratio and Reynolds number. This document deals with the toroidal- and cylindrical-throat CFNs for which direct calibration experiments have been made in sufficient number to enable the resulting coefficients to be used with certain predictable limits of uncertainty.

Document History

EN ISO 9300
June 1, 2022
Measurement of gas flow by means of critical flow nozzles
This document specifies the geometry and method of use (installation in a system and operating conditions) of critical flow nozzles (CFNs) used to determine the mass flow rate of a gas flowing...
August 1, 2005
Measurement of gas flow by means of critical flow Venturi nozzles
A description is not available for this item.
January 1, 1995
Measurement of Gas Flow by Means of Critical Flow Venturi Nozzles
A description is not available for this item.

References

Advertisement