ASTM-D3796 2009

$44.96

D3796-09 Standard Practice for Calibration of Type S Pitot Tubes

Published By	Publication Date	Number of Pages
ASTM	2009	13

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Category: ASTM

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Description

ASTM D3796-09

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 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 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.

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

Keywords

calibration; pitot tube; Type S pitot tube; Atmospheric analysis–emission testing of stacks and flues; Calibration–air/atmospheric analysis instruments; Emission testing–stacks and flues; Gases (atmospheric); Gas streams; Pitot tube method; Stacks/flues; Type S pitot tubes

ICS Code

ICS Number Code 17.020 (Metrology and measurement in general)

DOI: 10.1520/D3796-09

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Document Terminology Summary of Practice Significance and Use Apparatus
2	Procedure FIG. 1 FIG. 2
3	FIG. 3 FIG. 4
4	FIG. 5 FIG. 6
5	Calculation Precision and Bias FIG. 7
6	Keywords FIG. 8
7	A1. PROCEDURE FOR MULTIVELOCITY CALIBRATION OF TYPE S PITOT TUBES A1.1 Scope A1.2 Referenced Documents A1.3 Definitions A1.4 Summary of Test Method A1.5 Apparatus A1.6 Procedure FIG. 9 FIG. 10
8	A1.7 Calculation A1.8 Precision and Accuracy
9	FIG. A1.1
10	FIG. A1.2 FIG. A1.3
11	A2. USE OF CALIBRATED PITOBE ASSEMBLIES TO MEASURE VELOCITY IN SMALL DUCTS A2.1 FIG. A2.1
12	REFERENCES FIG. A2.2