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ASTM D6773-22
Standard Test Method for Bulk Solids Using Schulze Ring Shear Tester
Přeložit název
NORMA vydána dne 15.10.2022
Informace o normě:
Označení normy: ASTM D6773-22
Datum vydání normy: 15.10.2022
Kód zboží: NS-1099424
Počet stran: 28
Přibližná hmotnost: 84 g (0.19 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM D6773-22 :
Keywords:
bulk solid, effective angle of friction, effective yield locus, flow function, flowability, Jenike Shear Cell, internal friction angle, kinematic wall friction angle, powder, Schulze Ring Shear Tester, translational shear tester, unconfined yield strength, wall friction,, ICS Number Code 59.080.01 (Textiles in general)
Doplňující informace
| Significance and Use | ||||||||||||
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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 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.
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| 1. Scope | ||||||||||||
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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 users 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?UnitsThe 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, 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. |
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| 2. Referenced Documents | ||||||||||||
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