Revised Standard from Last Update.

1. SCOPE

1.1 This Indian Standard describes general direction for the apparatus and procedures, using relative density separation methods for determining the float and sink characteristics of raw coal and of products from coal preparation plants. The coal washability data prepared on the basis of the procedure are of use in designing and redesigning plant and in predicting, controlling and assessing the performance of the plant.

1.2 It is essential that when tests other than these for routine control purposes are carried out, there is precise instruction regarding size ranges and relative density fractions to establish the scope of information and accuracy required.