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ČSN EN ISO 9300 (257713)
Measurement of gas flow by means of critical flow nozzles
Translate name
STANDARD published on 1.1.2023
The information about the standard:
Designation standards: ČSN EN ISO 9300
Classification mark: 257713
Catalog number: 515777
Publication date standards: 1.1.2023
SKU: NS-1098015
The number of pages: 136
Approximate weight : 439 g (0.97 lbs)
Country: Czech technical standard
Category: Technical standards ČSN
The category - similar standards:
Annotation of standard text ČSN EN ISO 9300 (257713):
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
Preview of the standard ČSN EN ISO 9300 (257713)
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