Part 37 (2/2)

12 CALORIFIC TESTS AND analYSES OF COAL

The quality of the fuel should be determined by calorific tests and analysis of the coal sample above referred to[70]

13 analYSES OF FLUE GASES

For approxiases, the Orsat apparatus, or some modification thereof, should be employed If momentary samples are obtained the analyses should be made as frequently as possible, say, every 15 to 30at the ti conditions If the saer

14 SMOKE OBSERVATIONS[71]

In tests of bitu a determination of the aularly throughout the trial at intervals of 5at the sa conditions

15 CALCULATION OF RESULTS

Thethose results which are not self-evident are explained as follows:

(A) _Efficiency_ The ”efficiency of boiler, furnace and grate” is the relation between the heat absorbed per pound of coal fired, and the calorific value of one pound of coal

The ”efficiency of boiler and furnace” is the relation between the heat absorbed per pound of combustible burned, and the calorific value of one pound of combustible This expression of efficiency furnishes aone boiler and furnace with another, when the losses of unburned coal due to grates, cleanings, etc, are eliminated

The ”coht of coal supplied to the boiler, the ht of ash and unburned coal withdrawn froht of dust, soot, and refuse, if any, withdrawn fro ash carried away in the gases, if any, determined from the analysis of coal and ash The ”co the calorific value is the weight of coal less the moisture and ash found by analysis

The ”heat absorbed” per pound of coal, or co the equivalent evaporation frorees per pound of coal or combustible by 9704

Other items in this section which have been treated elsewhere are:

(B) Corrections for moisture in steam

(C) Correction for live steam used