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: D3180 - 15 (Reapproved 2023) INTERNATIONAL Standard Practice for Calculating Coal and Coke Analvses from As-Determined to Different Bases1 This standard is issued under the fixed designation D3180; 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 (s) indicates an editorial change since the last revision or reapproval. E29 Practice for Using Significant Digits in Test Data to 1. Scope Determine Conformance with Specifications 1.1 This practice lists formulas that allow analytical data to be expressed in various bases in common use. Such bases are: 3. Terminology as received, dry, equilibrium moisture, dry ash free, and others. 3.1 Definitions: 1.2 The values stated in SI units are to be regarded as 3.1.1 as-determined basis-analytical data obtained from standard. No other units of measurement are included in this the analysis sample of coal or coke after conditioning and standard. preparation to No. 60 (250-μm) sieve in accordance with 1.3 This standard does not purport to address all of the Practice D2013 and Test Method D3302. As-determined data safety concerns, if any, associated with its use. It is the represents the numerical values obtained at the particular responsibility of the user this standard to establish appropriate moisture level in the sample at the time of analysis. These safety, health, and environmental practices and determine the values are normally converted, according to formulae con- applicability of regulatory limitations prior to use. tained herein, to conventional reporting bases. 1.4 This international standard was developed in accor- 3.1.2 as-received basis—analytical data calculated to the dance with internationally recognized principles on standard- moisture condition of the sample as it arrived at the laboratory ization established in the Decision on Principles for the and before any processing or conditioning. If the sample has Development of International Standards, Guides and Recom- been maintained in a sealed state so that there has been no gain mendations issued by the World Trade Organization Technical orloss,theas-receivedbasisisequivalenttothemoisturebasis Barriers to Trade (TBT) Committee. as sampled. 2. Referenced Documents 3.1.3 dry basis-data calculated to a theoretical base of no moistureassociated withthesample.Thenumericalvalueas 2.1 ASTM Standards:2 established by Test Methods D3173 or D7582 is used for D388 Classification of Coals by Rank converting the as-determined data to a dry basis. D1412 Test Method for Equilibrium Moisture of Coal at 96 3.1.4 dry, ash-free basis-data calculated to a theoretical to 97 Percent Relative Humidity and 30 °C base of no moisture or ash associated with the sample. D2013 Practice for Preparing Coal Samples for Analysis Numerical values as established by Test Methods D3173 D3173 Test Method for Moisture in the Analysis Sample of D3174, or, D7582 are used for converting the as-determined Coal and Coke data to a moisture- and ash-free basis. D3174 Test Method for Ash in the Analysis Sample of Coal and Coke from Coal 3.1.5 equilibrium moisture base-data calculated to the D3302 Test Method for Total Moisture in Coal moisture level established as the equilibrium moisture. Nu- D7582 Test Methods for Proximate Analysis of Coal and merical values as established by Test Method D1412 are used Coke by Macro Thermogravimetric Analysis for the calculation. 4. Significance and Use 4.1 The calculations of analytical data for the coal and coke 1 This practice is