ASTM D4931 Standard Test Method for Gross Moisture in Green Petroleum Coke
1. Scope
1.1 This test method covers both the preparation procedure for samples containing free water (air drying loss (ADL) on gross moisture samples) and the determination of the gross moisture content of green petroleum coke.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.3 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.
2. Referenced Documents
2.1 ASTM Standards:
D2013 Practice for Preparing Coal Samples for Analysis
D2234/D2234M Practice for Collection of a Gross Sample of Coal
D3302 Test Method for Total Moisture in Coal
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 air drying, n - a process of partial drying of a green petroleum coke sample to bring it to near equilibrium with the atmosphere in the room in which further reduction/division of the petroleum coke sample is to take place.
3.1.2 air dry loss, ADL, n - the loss in mass, expressed as a percentage, resulting from each air drying operation.
3.1.3 free water, n - visible unbound water in the sample.
3.1.4 green petroleum coke, n - same as raw petroleum coke.
3.1.5 gross moisture, n - that moisture determined as the loss in mass in an air atmosphere under rigidly controlled conditions of temperature, time, and air flow.
3.1.5.1 Discussion - Test Method D3302 prescribes the above controlled conditions.
3.1.6 petroleum coke, n - solid, carbonaceous residue produced by thermal decomposition of heavy petroleum fractions, or cracked stocks, or both.
3.1.7 residual moisture, n - that moisture remaining in the sample after air drying.
3.1.8 total moisture, n - synonym for gross moisture.
