ASTM D2638 Test Method for Real Density of Calcined Petroleum Coke by Helium Pycnometer
7. Apparatus
7.1 Analytical Balance, accurate to +/- 0.1 mg.
7.2 Desiccator.
7.3 Drying Oven, preferably a vacuum oven, for temperature to 120 °C.
7.4 Helium Pycnometer:
7.5 Jaw Crusher and Roll Crusher - Other style crushers which allow control over particle size without contamination are acceptable.
7.6 Rifflers, with hoppers and closures.
7.7 Wire Sieve, 75 µm (U.S. No. 200 mesh), meeting Specification E11.
8. Reagents and Materials
8.1 Helium, 99.9 %.
9. Sample Preparation
9.1 For recommended practice for obtaining, handling, and preparing coke samples, refer to Test Methods D346, D2013, D2234/D2234M, D4057, and D4930. The equipment and procedures for crushing and dividing are also described in these test methods.
9.2 Reduce and divide the gross sample to obtain a laboratory analysis sample.
9.3 Divide, by riffling, a minimum of 100 g from the laboratory analysis sample.
NOTE 1 - The amount of coke required will be dictated by the operating instructions supplied by the helium pycnometer manufacturer. However, to assure that the test sample is representative of the entire sample, a minimum sample size of 100 g is required.
9.4 When a dedusting oil is present it must be removed prior to further sizing. Refer to Test Method D4930 for dedust oil removal.
9.5 Crush 100 g of the test sample so that the entire sample will pass through a 75 µm (No. 200) sieve. Dry the crushed sample in a drying oven at 115 °C +/- 5 °C to constant mass (approximately 8 h). Cool in a desiccator.
