Part 36 (1/2)

_(A) Dimensions:_

Measure the dimensions of the principal parts of the apparatus to be tested, so far as they bear on the objects in view, or detereneral features of the same, both exterior and interior, and n

The di surfaces of boilers and superheaters to be found are those of surfaces in contact with the fire or hot gases The subed surfaces in boilers at thesurfaces, and other surfaces which are exposed to the gases as superheating surfaces

_(B) Exah examination of the physical condition of all parts of the plant or apparatus which concern the object in view, and record the conditions found, together with any points in the matter of operation which bear thereon

In boilers, exae of tubes and riveted or other rates and baffles Exa doors for air leaks, either by shutting the da smoke or by candle-fla surfaces with reference to exterior deposits of soot and interior deposits of ed that condensed and entrained water cannot flow back into the boiler

If the object of the test is to deterhest efficiency or capacity obtainable, any physical defects, or defects of operation, tending to make the result unfavorable should first be re cleaned, and the whole put in first-class condition

If, on the other hand, the object is to ascertain the perfor conditions, no such preparation is either required or desired

_(C) General Precautions against Leakage:_

In steah blow-offs, drips, etc, or any stea test, which would in any way affect the results All such connections should be blanked off, or satisfactory assurance should be obtained that there is leakage neither out nor in This is a most important matter, and no assurance should be considered satisfactory unless it is susceptible of absolute demonstration

3 FUEL

Determine the character of fuel to be used[62] For tests of maximum efficiency or capacity of the boiler to compare with other boilers, the coal should be of soarded as a standard for the locality where the test is arded for semi-bituminous coals are Pocahontas (Va and W Va) and New River (W Va); for anthracite coals those of the No 1 buckwheat size, fresh- not over 13 per cent ash by analysis; and for bituh coals In soheny Mountains the semi-bituminous Clearfield (Pa) and cumberland (Md) are also considered as standards These coals when of good quality possess the essentials of excellence, adaptability to various kinds of furnaces, grates, boilers, andwidely distributed and generally accessible in the Eastern rades of coal enerally considered as standards for testing purposes; the best coal obtainable in any particular locality being regarded as the standard of comparison

A coal selected for maximum efficiency and capacity tests, should be the best of its class, and especially free frouarantee and other tests with a specified coal containing not more than a certain aher in ash and in moisture than the stated amounts, because any increase is liable to reduce the efficiency and capacity more than the equivalent proportion of such increase

The size of the coal, especially where it is of the anthracite class, should be deter a suitable sample

4 APPARATUS AND INSTRUMENTS[63]

The apparatus and instruments required for boiler tests are:

(A) Platfor coal and ashes