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Significance and Use
5.1 The procedures presented in this test method are available, in part, in Test Methods D3685/D3685M, as well as the ASME Methods (PTC 19.10-1968, PTC 19.10-1981, and PTC 38-1980) given in 2.3 and Footnote 5,5 the 40 CFR Part 60 given in 2.4, and the publication given in Footnote 6.6
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, where the direction of flow is normal to the face tube opening of the pitot tube employed in the method. The method cannot be used for direct measurement when cyclonic or swirling flow conditions are present.
1.6 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.
Code of Federal Regulation40 CFR Part 60 Standards of Performance for Stationary Sources, Appendix A1, Test Methods 1 through 4
ASME Performance Test Code StandardsPTC 19.10-1968
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
D6522 Test Method for Determination of Nitrogen Oxides, Carbon Monoxide, and Oxygen Concentrations in Emissions from Natural Gas-Fired Reciprocating Engines, Combustion Turbines, Boilers, and Process Heaters Using Portable Analyzers
E337 Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
E2251 Specification for Liquid-in-Glass ASTM Thermometers with Low-Hazard Precision Liquids
EPA StandardsEPA-600/4-77-027b Quality Assurance Handbook for Air Pollution Measurement Systems. Vol III. Stationary Source Specific Methods EPA-600/9-76-005 Quality Assurance Handbook for Air Pollution Measurement Systems. Vol I. Principles
ICS Number Code 17.120.20 (Flow in open channels)
UNSPSC Code 77121500(Air pollution)
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ASTM D3154-14, Standard Test Method for Average Velocity in a Duct (Pitot Tube Method), ASTM International, West Conshohocken, PA, 2014, www.astm.orgBack to Top