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  • ASTM
    D3796-09(2024) Standard Practice for Calibration of Type S Pitot Tubes
    Edition: 2024
    $113.57
    Unlimited Users per year

Description of ASTM-D3796 2024

ASTM D3796-09-Reapproved2024

Historical Standard: Standard Practice for Calibration of Type S Pitot Tubes




ASTM D3796

Scope

1.1 This practice covers the determination of Type S pitot tube coefficients in the gas velocity range from 305 m/min to 1524 m/min or 5.08 m/s to 25.4 m/s (1000 ft/min to 5000 ft/min). The method applies both to the calibration of isolated Type S pitot tubes (see 5.1), 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 (Annex A1) should be used. The calibration coefficients determined for the Type S pitot tube by this practice do not apply in field use when the flow is nonaxial to the face of the tube.

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).

1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.

1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


Keywords

calibration; pitot tube; Type S pitot tube;


ICS Code

ICS Number Code 17.020 (Metrology and measurement in general)


DOI: 10.1520/D3796-09R24

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