A Coal Manual for Salesmen, Buyers and Users

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National coal mining news, 1921 - 184 σελίδες
 

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Σελίδα 38 - Moisture 1. The coal shall be sampled when it is being loaded into or unloaded from railroad cars, ships, barges, or wagons, or when discharged from supply bins, or from industrial railway cars, or grab buckets, or from any coalconveying equipment, as the case may be. If the coal is crushed as received, samples usually can be taken advantageously after the coal has passed thru the crusher.
Σελίδα 38 - The increments shall be regularly and systematically collected, so that the entire quantity of coal sampled will be represented proportionately in the gross sample, and with such frequency that a gross sample of the required amount shall be collected. The standard gross sample shall not be less...
Σελίδα 43 - ... but if an analysis is in error, another analysis can easily be made of the original sample. Gross samples of the quantities designated herein must be taken whether the coal to be sampled consists of a few tons or several hundred tons, because of the following cardinal principle in sampling coal that must be recognized and understood; that is, the effect of the chance inclusion or exclusion of too many or too few pieces of slate or other impurities in what, or from what, would otherwise have been...
Σελίδα 43 - When this method of sampling is to be employed as a part of any contract or agreement, the following provisions shall be specifically agreed to by the parties to such contract or agreement: (a) The place at which the coal is to be sampled...
Σελίδα 40 - His next shovelful shall be spread directly over the top of the first shovelful, but in the opposite direction, and so on back and forth, the pile being occasionally flattened, until all the coal has been formed into one long pile (Figs.
Σελίδα 75 - In defining the unit of heat it is necessary to specify the temperature of the water because the amount of heat necessary to raise the temperature of one pound of water through one degree varies slightly at different temperatures.
Σελίδα 39 - When coal is extremely lumpy, it is best to break a proportional amount of the lumps before taking the various increments of a sample. Provision should be made for the preservation of the integrity of the sample.
Σελίδα 40 - I shall be crushed so that no pieces of coal and impurities will be greater in any dimension, as judged by eye, than specified for the sample before division into two approximately equal parts. The method of reducing by hand the quantity of coal in a gross sample shall be carried out as prescribed in Section 6, even should the initial size of coal and impurities be less than indicated in Table I.
Σελίδα 41 - ... shall be placed on a suitable cloth, measuring about 6 by 8 ft., mixed by raising first one end of the cloth and then the other (Figs.
Σελίδα 75 - Btu is denned as the amount of heat necessary to raise the temperature of one pound of water, at its maximum density, one degree Fahrenheit.

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