ASTM D3464-96(2014)

Standard Test Method for Average Velocity in a Duct Using a Thermal Anemometer

SIGNIFICANCE AND USE
5.1 The method presented is a “short method” that may be used where contamination levels are less than 5000 ppm by weight or volume, temperatures are between 0°C (32°F) and 65°C (150°F), and the humidity is not considered. The gas is considered as standard air and the velocity is read directly from the instrument.  
5.2 This test method is useful for determining air velocities in HVAC ducts, fume hoods, vent stacks of nuclear power stations, and in performing model studies of pollution control devices.
SCOPE
1.1 This test method describes the measurement of the average velocity with a thermal anemometer for the purpose of determining gas flow in a stack, duct, or flue (1-5).2 It is limited to those applications where the gas is essentially air at ambient conditions and the temperature, moisture, and contaminant loading are insignificant as sources of error compared to the basic accuracy of the typical field situation.  
1.2 The range of the test method is from 1 to 30 m/s (3 to 100 ft/s).  
1.3 The values stated in SI units are to be regarded as the standard.  
1.4 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.

General Information

• Status: Historical
• Publication Date: 31-Mar-2014
• ICS: 17.120.10 - Flow in closed conduits
• Technical Committee: D22 - Air Quality
• Drafting Committee: D22.03 - Ambient Atmospheres and Source Emissions

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D3464 − 96 (Reapproved 2014)
Standard Test Method for
1
Average Velocity in a Duct Using a Thermal Anemometer
This standard is issued under the fixed designation D3464; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 3. Terminology
1.1 This test method describes the measurement of the 3.1 For definitions of terms used in this test method, refer to
average velocity with a thermal anemometer for the purpose of Terminology D1356.
2
determining gas flow in a stack, duct, or flue (1-5). It is limited
4. Summary of Test Method
to those applications where the gas is essentially air at ambient
conditions and the temperature, moisture, and contaminant
4.1 This test method describes the operational and calibra-
loading are insignificant as sources of error compared to the
tion procedures necessary for the measurement of point veloc-
basic accuracy of the typical field situation.
ity and calculation of the average velocity of air or gas flows in
flues, ducts, or stacks utilizing a thermal anemometer.
1.2 The range of the test method is from 1 to 30 m/s (3 to
100 ft/s).
5. Significance and Use
1.3 The values stated in SI units are to be regarded as the
5.1 The method presented is a “short method” that may be
standard.
used where contamination levels are less than 5000 ppm by
1.4 This standard does not purport to address all of the
weight or volume, temperatures are between 0°C (32°F) and
safety concerns, if any, associated with its use. It is the
65°C (150°F), and the humidity is not considered. The gas is
responsibility of the user of this standard to establish appro-
considered as standard air and the velocity is read directly from
priate safety and health practices and determine the applica-
the instrument.
bility of regulatory limitations prior to use.
5.2 This test method is useful for determining air velocities
in HVAC ducts, fume hoods, vent stacks of nuclear power
2. Referenced Documents
stations, and in performing model studies of pollution control
3
2.1 ASTM Standards:
devices.
D1356 Terminology Relating to Sampling and Analysis of
Atmospheres
6. Apparatus
D3796 Practice for Calibration of Type S Pitot Tubes
6.1 Thermal Anemometer—A commercially available elec-
2.2 Other Standards:
trically operated hot sensor anemometer with direct readout. A
ASME PTC 19.5-72 Application of Fluid Meters, Sixth Ed.
thermal anemometer senses the cooling effect of a moving gas
1971 (Interim Supplement 19.5 on Instruments & Appa-
stream passing over an electrically heated sensor. This cooling
4
ratus)
effect or heat transfer rate is correlated to the velocity of the gas
stream. The instrument is calibrated to display a direct readout
in terms of velocity.
1
This test method is under the jurisdiction of ASTM Committee D22 on Air
6.2 Sensors and Probes—There are a number of different
Quality and is the direct responsibility of Subcommittee D22.03 on Ambient
Atmospheres and Source Emissions. types of sensors available for thermal anemometry including
Current edition approved April 1, 2014. Published May 2014. Originally
the hot-wire sensor, the hot-film sensor, and the quartz-coated
approved in 1975. Last previous edition approved in 2007 as D3464 – 96 (2007).
sensor. Probes are available in many different shapes depend-
DOI: 10.1520/D3464-96R14.
2
ing upon application.
The boldface numbers in parentheses refer to a list of references at the end of
this standard.
6.3 Temperature Compensation—If the temperature of the
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
gas stream changes during velocity measurements, the an-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
emometer reading will change accordingly unless a constant-
the ASTM website.
temperature or “temperature-compensated” anemometer is uti-
4
Available from American Society of Mechanical Engineers (ASME), ASME
lized. This type of instrument shall be specified for most
International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org. applications of this measurement standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3464 − 96 (2014)
6.3.1 Temperature-Compensated Anemometer—A patterns are essentially uniform, that is, 80 to 90 % of the
temperature-compensated anemomete
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D3464 − 96 (Reapproved 2007) D3464 − 96 (Reapproved 2014)
Standard Test Method for
1
Average Velocity in a Duct Using a Thermal Anemometer
This standard is issued under the fixed designation D3464; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This test method describes the measurement of the average velocity with a thermal anemometer for the purpose of
2
determining gas flow in a stack, duct, or flue (1-5). It is limited to those applications where the gas is essentially air at ambient
conditions and the temperature, moisture, and contaminant loading are insignificant as sources of error compared to the basic
accuracy of the typical field situation.
1.2 The range of the test method is from 1 to 30 m/s (3 to 100 ft/s).
1.3 The values stated in SI units are to be regarded as the standard.
1.4 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
3
2.1 ASTM Standards:
D1356 Terminology Relating to Sampling and Analysis of Atmospheres
D3796 Practice for Calibration of Type S Pitot Tubes
2.2 Other Standards:
4
ASME PTC 19.5-72 Application of Fluid Meters, Sixth Ed. 1971 (Interim Supplement 19.5 on Instruments & Apparatus)
3. Terminology
3.1 For definitions of terms used in this test method, refer to Terminology D1356.
4. Summary of Test Method
4.1 This test method describes the operational and calibration procedures necessary for the measurement of point velocity and
calculation of the average velocity of air or gas flows in flues, ducts, or stacks utilizing a thermal anemometer.
5. Significance and Use
5.1 The method presented is a “short method” that may be used where contamination levels are less than 5000 ppm by weight
or volume, temperatures are between 0°C (32°F) and 65°C (150°F), and the humidity is not considered. The gas is considered as
standard air and the velocity is read directly from the instrument.
5.2 This test method is useful for determining air velocities in HVAC ducts, fume hoods, vent stacks of nuclear power stations,
and in performing model studies of pollution control devices.
1
This test method is under the jurisdiction of ASTM Committee D22 on Air Quality and is the direct responsibility of Subcommittee D22.03 on Ambient Atmospheres
and Source Emissions.
Current edition approved April 1, 2007April 1, 2014. Published June 2007May 2014. Originally approved in 1975. Last previous edition approved in 20012007 as
D3464 - 96D3464 – 96 (2007).(2001). DOI: 10.1520/D3464-96R07.10.1520/D3464-96R14.
2
The boldface numbers in parentheses refer to the references listed a list of references at the end of this method.standard.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
4
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, ThreeTwo Park Ave., New York, NY 10016-5990,
http://www.asme.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3464 − 96 (2014)
6. Apparatus
6.1 Thermal Anemometer—A commercially available electrically operated hot sensor anemometer with direct readout. A
thermal anemometer senses the cooling effect of a moving gas stream passing over an electrically heated sensor. This cooling effect
or heat transfer rate is correlated to the velocity of the gas stream. The instrument is calibrated to display a direct readout in terms
of velocity.
6.2 Sensors and Probes—There are a number of different types of sensors available for thermal anemometry including the
hot-wire sensor, the hot-film sensor, and the quartz-coated sensor. Probes are available in many different shapes depending upon
application.
6.3 Temperature Compensation—If the temperature of the gas stream changes during velocity m
...