Part 36 (2/2)

(B) Graduated scales attached to the water glasses

(C) Tanks and platfor water (or water meters calibrated in place) Wherever practicable the feed water should be weighed, especially for guarantee tests The most satisfactory and reliable apparatus for this purpose consists of one orelevated a sufficient distance above the floor to e connected to the feed pu tank should be of larger size than the weighing tank, to afford sufficient reserve supply to the pu tank is used it should preferably be of such capacity as to require e not oftener than every 5 minutes If two or s should not be less than 3 auges

(E) Calori the calorific value of fuel and the quality of stea apparatus

5 OPERATING CONDITIONS

Deter should be to conforhout the trial, as nearly as possible

Where uniforement can be usually made to dispose of the steale boiler it h a waste pipe and regulating the amount by means of a valve In a battery of boilers, in which only one is tested, the draftde the test boiler to work under a steady rate of evaporation

6 DURATION

The duration of tests to determine the efficiency of a hand-fired boiler, should be 10 hours of continuous running, or such time as may be required to burn a total of 250 pounds of coal per square foot of grate

In the case of a boiler using a mechanical stoker, the duration, where practicable, should be at least 24 hours If the stoker is of a type that per and end of the test to be accurately estimated, the duration may be reduced to 10 hours, or such time as may be required to burn the above noted total of 250 pounds per square foot

In commercial tests where the service requires continuous operation night and day, with frequent shi+fts of firemen, the duration of the test, whether the boilers are hand fired or stoker fired, should be at least 24 hours Likewise in cole boiler or of a plant of several boilers, which operate regularly a certain nu the balance of the day the fires are banked, the duration should not be less than 24 hours

The duration of tests to determine thethe efficiency, should not be less than 3 hours

7 STARTING AND STOPPING

The conditions regarding the temperature of the furnace and boiler, the quantity and quality of the live coal and ash on the grates, the water level, and the steam pressure, should be as nearly as possible the sa of the test

To secure the desired equality of conditions with hand-fired boilers, the followingwell heated by a prelihly clean it, leaving enough live coal spread evenly over the grate (say 2 to 4 inches),[64] to serve as a foundation for the new fire Note quickly the thickness of the coal bed as nearly as it can be estimated or measured; also the water level,[65] the steam pressure, and the ti tihed for the test, the ashpit throughly cleaned, and the regular work of the test proceeded with Before the end of the test the fire should again be burned low and cleaned in such a rate as at the start When this condition is reached, observe quickly the water level,[65] the steam pressure, and the ti ti a correction should beadditional water after the final readings are taken Finally remove the ashes and refuse fro several boilers where it is not practicable to clean them simultaneously, the fires should be cleaned one after the other as rapidly as h coal tocondition After the last fire is cleaned and in working condition, burn all the fires low (say 4 to 6 inches), note quickly the thickness of each, also the water levels, stea ti the test, the fires should be quickly cleaned one by one, and when this work is completed they should all be burned low the same as the start, and the various observationsseveral furnace doors requiring the fire to be cleaned in sections one after the other, the above directions pertaining to starting and stopping in a plant of several boilers may be followed

To obtain the desired equality of conditions of the fire when a rate is used, the procedure should be ulate the coal feed so as to burn the fire to the low condition required for cleaning Shut off the coal-feeding mechanism and fill the hoppers level full Clean the ash or dump plate, note quickly the depth and condition of the coal on the grate, the water level,[66] the steam pressure, and the ti ti ular work of the test

When the time arrives for the close of the test, shut off the coal-feeding mechanism, fill the hoppers and burn the fire to the sa When this condition is reached, note the water level, the steam pressure, and the ti time Finally clean the ashplate and haul the ashes