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ASTM D3796-90(2004)

Historical Reaffirmation

Standard Practice for Calibration of Type S Pitot Tubes

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1.1 This practice covers the determination of Type S pitot tube coefficients in the gas velocity range from 305 to 1524 m/min or 5.08 to 25.4 m/s [1000 to 5000 ft/min]. The method applies both to the calibration of isolated Type S pitot tubes (see ), and pitobe assemblies.

1.2 This practice outlines procedures for obtaining Type S pitot tube coefficients by calibration at a single-velocity setting near the midpoint of the normal working range. Type S pitot coefficients obtained by this method will generally be valid to within 3 % over the normal working range. If a more precise correlation between Type S pitot tube coefficient and velocity is desired, multivelocity calibration technique () should be used.

1.3 This practice may be used for the calibration of thermal anemometers for gas velocities in excess of 3 m/s [10 ft/s].

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


The Type S pitot tube (Fig. 1) is often used to measure the velocity of flowing gas streams in industrial smokestacks and ducts. Before a Type S pitot tube is used for this purpose, its coefficients must be determined by calibration against a standard pitot tube (2).

SDO ASTM: ASTM International
Document Number D3796
Publication Date Oct. 1, 2004
Language en - English
Page Count 13
Revision Level 90(2004)
Supercedes
Committee D22.01
Publish Date Document Id Type View
May 1, 2024 D3796-09R24E01 Revision
Oct. 1, 2004 D3796-09 Revision
May 1, 2024 D3796-09R24 Reaffirmation
Sept. 1, 2016 D3796-09R16 Reaffirmation
Oct. 1, 2004 D3796-90R04 Reaffirmation
Nov. 30, 1990 D3796-90R98 Reaffirmation