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Description of ASTM-D4702 1997ASTM D4702-97Historical Standard: Standard Guide for Inspecting Crosscut, Sweep-Arm, and Auger Mechanical Coal-Sampling Systems for Conformance with Current ASTM StandardsASTM D4702Scope 1.1 This guide is applicable to crosscut, sweep-arm, and auger sampling systems. 1.1.1 Crosscut and Sweep-Arm Samplers -A crosscut sampler collects an increment as the sampler traverses a freely falling stream of coal, such as coal freely falling in a chute or freely falling from the head pulley of a conveyor. A sweep-arm sampler collects an increment as the sampler traverses a bed of coal on a moving conveyor belt. Both crosscut and sweep-arm sampling are designated Condition B (Full-Stream Cut) as defined in Section 6, Increment Collection Classification, of Test Methods D2234. 1.1.2 Auger Samplers -An auger sampler collects an increment of coal as the auger is inserted vertically into a stationary load of coal contained within a railcar, truck, or barge. Auger sampling is designated Condition D (Stationary Coal Sampling) as defined in Section 6, Increment Collection Classification, of Test Methods D2234. 1.2 Spacing of increments pertains to the kind of interval between increments. Intervals can be defined in quantitative terms, such as units of time or mass, or in terms of position over the lot. 1.2.1 Spacing of Increments for Crosscut and Sweep-Arm Samplers -Crosscut- and sweep-arm type mechanical sampling systems take increments based on time, either at fixed time intervals or at random times during a fixed time strata. Some crosscut samplers can take increments based on equal mass of coal sampled as determined by scales. The sections of this guide that pertain to crosscut and sweep-arm samplers describe procedures for only time-based sampling systems. This time-based inspection guideline will satisfy most criteria for mass-based or combination mass-based and time-based sampling systems. If there are items that are not covered, the inspector should refer to the manufacturer's literature. 1.2.2 Spacing of Increments for Auger Sampling -The spacing of increments collected by auger sampling systems is defined in terms of position over the lot. 1.3 It is essential that the inspector have the documentation listed in Section 2 of this guide when conducting an inspection. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 This standard does not purport to address all of the safety problems, 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. For a specific hazard statement, see Section 5. Keywords coal sampling; inspection; mechanical sampling; sampling systems ICS Code ICS Number Code 75.160.10 (Solid fuels) DOI: 10.1520/D4702-97 The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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