ASTM D2638 Test Method for Real Density of Calcined Petroleum Coke by Helium Pycnometer
1. Scope
1.1 This test method covers the determination of the real density (RD) of calcined petroleum coke. Real density, by definition is obtained when the particle size of the specimen is smaller than 75 µm (U.S. No. 200 Sieve).
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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:
D346 Practice for Collection and Preparation of Coke Samples for Laboratory Analysis
D2013 Practice for Preparing Coal Samples for Analysis
D2234/D2234M Practice for Collection of a Gross Sample of Coal
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4292 Test Method for Determination of Vibrated Bulk Density of Calcined Petroleum Coke
D4930 Test Method for Dust Control Material on Calcined Petroleum Coke
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions:
3.1.1 calcined petroleum coke, n - petroleum coke that has been thermally treated to drive off the volatile matter and to develop crystalline structure.
3.1.2 petroleum coke, n - a solid, carbonaceous residue produced by thermal decomposition of heavy petroleum fractions or cracked stocks, or both.
3.2 Definitions ofTerms Specific to This Standard:
3.2.1 bulk density, n - the mass of the particles divided by the volume they occupy which includes the space between the particles. Refer to Test Method D4292 for bulk density procedures.
3.2.2 dedusting material, n - See Test Method D4930.
3.2.3 real density, n - (RD) (also be referred to as true specific gravity). The mass divided by the volume occupied by the material excluding pores and voids. It is required, therefore, that voids in the coke be eliminated and that pores in the material be filled by the fluid being displaced. This requirement is met for the purposes ofthis test method by reducing the coke particles to a size smaller than 75 µm.
3.2.3.1 Discussion - The density of particles larger than 75 µm up to the largest that can be put into the helium pycnometer can also be determined, but must be designated as particle density (PD). The precision data obtained for RD may not be applicable to PD.
