The procedures presented in this test method are available, in part, in Test Method D 3685/D 3685M, as well as the ASME Methods given in 2.3 and Footnote 8,⁵ the CFR given in 2.4, and the publication given in Footnote 9.⁶

1. Scope

1.1 This test method describes measurement of the average velocity of a gas stream for the purpose of determining gas flow in a stack, duct, or flue. Although technically complex, it is generally considered the most accurate and often the only practical test method for taking velocity measurements.

1.2 This test method is suitable for measuring gas velocities above 3 m/s (10 ft/s).

1.3 This test method provides procedures for determining stack gas composition and moisture content.

1.4 The values stated in SI units are to be regarded as standard. The inch-pound units given in parentheses are for information only.

1.5 This test method is applicable to conditions where steady-state flow occurs, and for constant fluid conditions. If these conditions are not meant, other methods must be used.

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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1071 Test Methods for Volumetric Measurement of Gaseous Fuel Samples

D1193 Specification for Reagent Water

D1356 Terminology Relating to Sampling and Analysis of Atmospheres

D3195 Practice for Rotameter Calibration

D3631 Test Methods for Measuring Surface Atmospheric Pressure

D3685/D3685M Test Methods for Sampling and Determination of Particulate Matter in Stack Gases

D3796 Practice for Calibration of Type S Pitot Tubes

E1 Specification for ASTM Liquid-in-Glass Thermometers

E337 Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)

EPA Standards

ASME Standards

Code of Federal Regulation

Keywords

stack gas velocity; pitot traverse; pitot tube; Staubscheibe pitot tube; Type S pitot tube; Orsat; Orsat analyzer; Method 1; Method 2; Method 3; Method 4; stack gas moisture; stack gas molecular weight; stack gas density;

ICS Code

ICS Number Code 17.120.20 (Flow in open channels)

Citing ASTM Standards

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