ASTM D6326-22

Standard Practice for Selection of Maximum Transit-Rate Ratios and Depths for the U.S. Series of Isokinetic Suspended-Sediment Samplers

SIGNIFICANCE AND USE
5.1 This practice describes the maximum transit-rate ratios and depths that can be used for selected isokinetic suspended-sediment sampler/nozzle/container configurations in order to insure isokinetic sampling.  
5.2 This practice is designed to be used by field personnel collecting whole-water samples from open channel flow.
SCOPE
1.1 This practice covers the maximum transit-rate ratios and depths for selected suspended-sediment sampler-nozzle-container configurations.  
1.2 This practice explains the reasons for limiting the transit-rate ratio and depths that suspended-sediment samplers can be correctly used.  
1.3 This practice give maximum transit-rate ratios and depths for selected isokinetic suspended-sediment sampler/nozzle/container size for samplers developed by the Federal Interagency Sedimentation Project.  
1.4 Throughout this practice, a samplers lowering rate is assumed to be equal to its raising rate.  
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 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.

General Information

• Status: Published
• Publication Date: 30-Apr-2022
• ICS: 13.080.05 - Examination of soils in general
• Technical Committee: D19 - Water
• Drafting Committee: D19.07 - Sediments, Geomorphology, and Open-Channel Flow

Standards Content (Sample)

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.
Designation: D6326 − 22
Standard Practice for
Selection of Maximum Transit-Rate Ratios and Depths for
1
the U.S. Series of Isokinetic Suspended-Sediment Samplers
This standard is issued under the fixed designation D6326; 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.
1. Scope D4410 Terminology for Fluvial Sediment
D4411 Guide for Sampling Fluvial Sediment in Motion
1.1 This practice covers the maximum transit-rate ratios and
depths for selected suspended-sediment sampler-nozzle-
3. Terminology
container configurations.
3.1 Definitions:
1.2 This practice explains the reasons for limiting the
3.1.1 For definitions of terms used in this practice, refer to
transit-rate ratio and depths that suspended-sediment samplers
Terminology D1129 and Terminology D4410.
can be correctly used.
3.2 Definitions of Terms Specific to This Standard:
1.3 This practice give maximum transit-rate ratios and
3.2.1 approach angle, n—the angle between the velocity
depths for selected isokinetic suspended-sediment sampler/
vector of the approaching flow and the centerline of the nozzle.
nozzle/container size for samplers developed by the Federal
3.2.2 approaching flow, n—flow immediately upstream of a
Interagency Sedimentation Project.
nozzles entrance.
1.4 Throughout this practice, a samplers lowering rate is
3.2.3 bag sampler, n—a suspended-sediment sampler that
assumed to be equal to its raising rate.
uses a flexible collapsible bag as a sample container.
1.5 The values stated in inch-pound units are to be regarded
3.2.4 compression rate, n—the rate at which the air is
as standard. The values given in parentheses are mathematical
compressed in the sample container and is a function of the
conversions to SI units that are provided for information only
speed at which the sampler is lowered in the sampling vertical.
and are not considered standard.
3.2.5 isokinetic, adj—the conditions under which the direc-
1.6 This standard does not purport to address all of the
tion and speed of the flowing water/sediment mixture are
safety concerns, if any, associated with its use. It is the
unchanged upon entering the nozzle of a suspended-sediment
responsibility of the user of this standard to establish appro-
sampler.
priate safety, health, and environmental practices and deter-
3.2.6 maximum transit rate, n—the maximum speed at
mine the applicability of regulatory limitations prior to use.
which the sampler can be lowered and raised in the sampling
1.7 This international standard was developed in accor-
vertical and still have the sample collected isokinetically.
dance with internationally recognized principles on standard-
3.2.7 transit rate, n—the speed at which the suspended
ization established in the Decision on Principles for the
sediment sampler is lowered and raised in the sampling
Development of International Standards, Guides and Recom-
vertical.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. 3.2.8 transit-rate ratio, n—the ratio computed by dividing
thetransitratebythemeanstreamvelocityintheverticalbeing
2. Referenced Documents
sampled.
2
2.1 ASTM Standards:
4. Summary of Practice
D1129 Terminology Relating to Water
4.1 This practice describes the maximum transit-rate ratios
1
This practice is under the jurisdiction of ASTM Committee D19 on Water and
and depths that can be used for selected isokinetic suspended-
the direct responsibility of Subcommittee D19.07 on Sediments, Geomorphology,
sediment sampler/nozzle/container configurations to ensure
and Open-Channel Flow.
isokinetic sampling. (Manufacturing differences in the produc-
Current edition approved May 1, 2022. Published June 2022. Originally
tion of sediment samplers may result in some samplers not
approved in 1998. Last previous edition approved in 2014 as D6326 – 08 (2014).
DOI: 10.1520/D6326-22.
collecting a sample isokinetically. It is the users responsibility
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
to ensure through calibration that the sampler does collect a
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
sample isokinetically. Guide D4411 describes a process for
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. checking calibration of suspended-sediment samplers.)
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. U
...

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: D6326 − 08 (Reapproved 2014) D6326 − 22
Standard Practice for
The Selection of Maximum Transit-Rate Ratios and Depths
for the U.S. Series of Isokinetic Suspended-Sediment
1
Samplers
This standard is issued under the fixed designation D6326; 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.
1. Scope
1.1 This practice covers the maximum transit-rate ratios and depths for selected suspended-sediment sampler-nozzle-container
configurations.
1.2 This practice explains the reasons for limiting the transit-rate ratio and depths that suspended-sediment samplers can be
correctly used.
1.3 This practice give maximum transit-rate ratios and depths for selected isokinetic suspended-sediment sampler/nozzle/container
size for samplers developed by the Federal Interagency Sedimentation Project.
1.4 Throughout this practice, a samplers lowering rate is assumed to be equal to its raising rate.
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.7 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1129 Terminology Relating to Water
D4410 Terminology for Fluvial Sediment
D4411 Guide for Sampling Fluvial Sediment in Motion
1
This practice is under the jurisdiction of ASTM Committee D19 on Water and the direct responsibility of Subcommittee D19.07 on Sediments, Geomorphology, and
Open-Channel Flow.
Current edition approved Jan. 1, 2014May 1, 2022. Published March 2014June 2022. Originally approved in 1998. Last previous edition approved in 20082014 as
D6326 – 08.D6326 – 08 (2014). DOI: 10.1520/D6326-08R14.10.1520/D6326-22.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D6326 − 22
3. Terminology
3.1 Definitions—Definitions:
3.1.1 For definitions of terms used in this practice, refer to Terminology D1129 and Terminology D4410.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 approach angle—angle, n—the angle between the velocity vector of the approaching flow and the centerline of the nozzle.
3.2.2 approaching flow—flow, n—flow immediately upstream of a nozzles entrance.
3.2.3 bag sampler—sampler, n—a suspended-sediment sampler that uses a flexible collapsible bag as a sample container.
3.2.4 compression rate—rate, n—the rate at which the air is compressed in the sample container and is a function of the speed
at which the sampler is lowered in the sampling vertical.
3.2.5 isokinetic—isokinetic, adj—the conditions under which the direction and speed of the flowing water/sediment mixture are
unchanged upon entering the nozzle of a suspended-sediment sampler.
3.2.6 maximum transit rate—rate, n—the maximum speed at which the sampler can be lowered and raised in the sampling vertical
and still have the sample collected isokinetically.
3.2.7 transit rate—rate, n—the speed at which the suspended sediment sampler is lowered and raised in the sampling vertical.
3.2.8 transit-rate ratio—ratio, n—the ratio computed by dividing the transit rate by the mean stream velocity in the vertical being
sampled.
4. Summary of Practice
4.1 This practice describes the maximum transit-rate ratios and depths that can be used for selected isokinetic suspended-sediment
sampler/nozzle/container configurations to ensu
...