Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ASTM D4749-87(2012)
• Năm ban hành / Publication date: 2012
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng Anh / Title in English: Standard Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size
• Chỉ số phân loại Quốc tế (ICS) / By field: 75.160.10 - Nhiên liệu rắn
• Số trang / Page: 10

Phạm vi áp dụng / Scope of standard

1.1 This test method covers procedures for determining the sieve analysis of coal and designating the size of coal from sieve analysis data. Raw as well as prepared (crushed, cleaned or screened) coals can be tested by this test method.

1.2 This test method explains how to designate coal sizes from the results of sieve analysis data in order to represent the condition of the coal as sold. In the case of special mixtures or coals with noncontinuous ranges of sizes, a sufficiently complete sieve analysis must be made to properly describe the size distribution.

1.3 This test method is not applicable for determining the sieve analysis nor for designating the size of pulverized coal. (See Note 1.) Size fractions down to and including 38 μm (No. 400 U.S.A. Standard Series) can be treated by the methods discussed in this test method. Methods for handling size fractions below 38 μm (No. 400) will be developed by this committee.

Note 1-For powdered or pulverized coal as is fired into steam boilers, refer to Test Method D197.

1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. The values stated in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining values in any way.

1.5 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.