ASTM D6773-22

Standard Test Method for Bulk Solids Using Schulze Ring Shear Tester

SIGNIFICANCE AND USE
5.1 Reliable, controlled flow of bulk solids from bins and hoppers is essential in almost every industrial facility. Unfortunately, flow stoppages due to arching and ratholing are common. Additional problems include uncontrolled flow (flooding) of powders, segregation of particle mixtures, usable capacity which is significantly less than design capacity, caking and spoilage of bulk solids in stagnant zones, and structural failures.  
5.2 By measuring the flow properties of bulk solids, and designing bins and hoppers based on these flow properties, most flow problems can be prevented or eliminated (1).3  
5.3 For bulk solids with a significant percentage of particles (typically, one third or more) finer than about 6 mm (1/4 in.), the unconfined yield strength is governed by the fines (−6 mm fraction). For such bulk solids, strength and wall friction tests may be performed on the fine fraction only.
Note 1: The quality of the result produced by this standard is dependent on the competence of personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself ensure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors. Practice D3740 was developed for agencies engaged in the testing or inspection (or both) of soil and rock. As such it is not totally applicable to agencies performing this standard. However, users of this standard should recognize that the framework of Practice D3740 is appropriate for evaluating the quality of an agency performing this standard. Currently there is no known qualifying national authority that inspects agencies that perform this standard.
SCOPE
1.1 This test method covers the apparatus and procedures for measuring the unconfined yield strength of bulk solids during both continuous flow and after storage at rest. In addition, measurements of internal friction, bulk density, and wall friction on various wall surfaces are included.  
1.2 This test method covers operation of the manually-controlled Schulze Ring Shear Tester. An automated version of this tester is also available. Its method of testing bulk solids is similar in principle to that described in this test method.  
1.3 The most common use of this information is in the design of storage bins and hoppers to prevent flow stoppages due to arching and ratholing, including the slope and smoothness of hopper walls to provide mass flow. Parameters for structural design of such equipment may also be derived from this data. Another application is the measurement of the flowability of bulk solids, for example, for comparison of different products or optimization.  
1.4 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.  
1.4.1 The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives: and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design.  
1.5 Units—The values stated in SI units are to be regarded as standard. No other units of measure are included in this standard.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the respons...

General Information

• Status: Published
• Publication Date: 14-Oct-2022
• ICS: 59.080.01 - Textiles in general
• Technical Committee: D18 - Soil and Rock
• Drafting Committee: D18.24 - Characterization and Handling of Powders and Bulk Solids

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: D6773 − 22
Standard Test Method for
1
Bulk Solids Using Schulze Ring Shear Tester
This standard is issued under the fixed designation D6773; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This test method covers the apparatus and procedures
responsibility of the user of this standard to establish appro-
for measuring the unconfined yield strength of bulk solids
priate safety, health, and environmental practices and deter-
during both continuous flow and after storage at rest. In
mine the applicability of regulatory limitations prior to use.
addition, measurements of internal friction, bulk density, and
1.7 This international standard was developed in accor-
wall friction on various wall surfaces are included.
dance with internationally recognized principles on standard-
1.2 This test method covers operation of the manually-
ization established in the Decision on Principles for the
controlledSchulzeRingShearTester.Anautomatedversionof
Development of International Standards, Guides and Recom-
this tester is also available. Its method of testing bulk solids is
mendations issued by the World Trade Organization Technical
similar in principle to that described in this test method.
Barriers to Trade (TBT) Committee.
1.3 The most common use of this information is in the
2. Referenced Documents
design of storage bins and hoppers to prevent flow stoppages
2
2.1 ASTM Standards:
due to arching and ratholing, including the slope and smooth-
D653Terminology Relating to Soil, Rock, and Contained
ness of hopper walls to provide mass flow. Parameters for
Fluids
structural design of such equipment may also be derived from
D2216Test Methods for Laboratory Determination ofWater
this data. Another application is the measurement of the
(Moisture) Content of Soil and Rock by Mass
flowability of bulk solids, for example, for comparison of
D3740Practice for Minimum Requirements for Agencies
different products or optimization.
Engaged in Testing and/or Inspection of Soil and Rock as
1.4 All observed and calculated values shall conform to the
Used in Engineering Design and Construction
guidelines for significant digits and rounding established in
D4753Guide for Evaluating, Selecting, and Specifying Bal-
Practice D6026.
ances and Standard Masses for Use in Soil, Rock, and
1.4.1 Theproceduresusedtospecifyhowdataarecollected/
Construction Materials Testing
recorded or calculated in this standard are regarded as the
D6026Practice for Using Significant Digits and Data Re-
industry standard. In addition, they are representative of the
cords in Geotechnical Data
significant digits that generally should be retained. The proce-
D6128Test Method for Shear Testing of Bulk Solids Using
dures used do not consider material variation, purpose for
the Jenike Shear Tester
obtaining the data, special purpose studies, or any consider-
E177Practice for Use of the Terms Precision and Bias in
ations for the user’s objectives: and it is common practice to
ASTM Test Methods
increase or reduce significant digits of reported data to be
E691Practice for Conducting an Interlaboratory Study to
commensuratewiththeseconsiderations.Itisbeyondthescope
Determine the Precision of a Test Method
of this standard to consider significant digits used in analysis
methods for engineering design. 3. Terminology
3.1 Definitions—For definitions of common technical terms
1.5 Units—The values stated in SI units are to be regarded
in this standard, refer to Terminology D653.
as standard. No other units of measure are included in this
standard.
4. Summary of Test Method
4.1 A representative specimen of bulk solid is placed in a
shear cell of specific dimensions.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
Rock and is the direct responsibility of Subcommittee D18.24 on Characterization
2
and Handling of Powders and Bulk Solids. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 15, 2022. Published January 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2002. Last previous edition approved in 2016 as D6773–16. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D6773-22. the ASTM website.
*A Summary of Changes section appears at
...

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: D6773 − 16 D6773 − 22
Standard Test Method for
1
Bulk Solids Using Schulze Ring Shear Tester
This standard is issued under the fixed designation D6773; 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 test method covers the apparatus and procedures for measuring the unconfined yield strength of bulk solids during both
continuous flow and after storage at rest. In addition, measurements of internal friction, bulk density, and wall friction on various
wall surfaces are included.
1.2 This test method covers operation of the manually-controlled Schulze Ring Shear Tester. An automated version of this tester
is also available. Its method of testing bulk solids is similar in principle to that described in this test method.
1.3 The most common use of this information is in the design of storage bins and hoppers to prevent flow stoppages due to arching
and ratholing, including the slope and smoothness of hopper walls to provide mass flow. Parameters for structural design of such
equipment may also be derived from this data. Another application is the measurement of the flowability of bulk solids, for
example, for comparison of different products or optimization.
1.4 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice
D6026.
1.4.1 The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as the industry
standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not
consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives:
and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations.
It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design.
1.5 Units—The values stated in SI units are to be regarded as standard. No other units of measure are included in this 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.
1
This test method is under the jurisdiction of ASTM Committee D18 on Soil and Rock and is the direct responsibility of Subcommittee D18.24 on Characterization and
Handling of Powders and Bulk Solids.
Current edition approved Feb. 1, 2016Oct. 15, 2022. Published March 2016January 2023. Originally approved in 2002. Last previous edition approved in 20082016 as
D6773 – 08.D6773 – 16. DOI: 10.1520/D6773-16.10.1520/D6773-22.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D6773 − 22
2. Referenced Documents
2
2.1 ASTM Standards:
D653 Terminology Relating to Soil, Rock, and Contained Fluids
D2216 Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
D3740 Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in
Engineering Design and Construction
D4753 Guide for Evaluating, Selecting, and Specifying Balances and Standard Masses for Use in Soil, Rock, and Construction
Materials Testing
D6026 Practice for Using Significant Digits and Data Records in Geotechnical Data
D6128 Test Method for Shear Testing of Bulk Solids Using the Jenike Shear Tester
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions—For commo
...