More than two years ago, D05 identified that D3302 does not properly address how to prepare a System Sample the product from a mechanical sampler. This term is now defined in D7430 and is added here to describe the output from a mechanical sampler. Since this sample is, technically, already crushed and divided, additional language is needed define how this sample should be added to the total moisture process. During the ASTM D05 meetings, a consensus of the attendees wanted an option to crush a system sample (often a 20 kg sample). Testing done by the D3302 task group showed that in some circumstances crushing before air drying removed a significant amount of moisture, and in some circumstances it had no significant effect. The testing that was done was unable to identify the specific situations that did or did not cause the moisture to be affected.
Keywordsair-drying; air-drying loss; coal; residual moisture; total moisture; Coal products--moisture; Heating tests--coal/coke; Moisture analysis--coal/coke; Total moisture analysis