Naval electricians' text book by Bullard William Hannum Grubb

Author:Bullard, William Hannum Grubb. [from old catalog]
Language: eng
Format: epub
Tags: Electrical engineering, Ships
Publisher: Annapolis, Md., United States naval institute
Published: 1908-03-25T05:00:00+00:00

Engines have been designed and constructed to meet the above specifications or others in force at the time by the General Electric Company, W. D. Forbes & Co., and The B. E. Sturtevant Company. In ships built by the Union Iron Works, there have usually been installed engines built by the same firm. As all are built under the same specifications, they all present the same general characteristics, differing in such details that are not specified, as the kinds of packing, style of governor, etc. By far the greatest number of engines in use have been furnished by the General Electric Company, and only those will be considered in any detail.

Tandem-Compound Type.

This type of engine, made by the General Electric Company, is used with generators of 16, 24, 32 and 50 kilowatts. A cross-section of this engine is shown in Fig. 227.

This design of engine seems to have met every requirement and has proven its worth after ten or more years of experience; the only objection being in the head room required, and which has necessitated the later design of the cross-compound type.

This type of engine gets its name from the two cylinders being in line; the power developed in the cylinders is transmitted to the crank-shaft by a single piston-rod which carries both pistons. The high-pressure cylinder is the lower and over it is secured the low-pressure cylinder. In the engine of the 32-kilowatt size these are respectively 9 inches and 15 inches in diameter with a 6-inch stroke.

The steam valves are cast-iron balanced valves. The high-pressure valve receives its motion from the governor through a rocker arm and the low pressure from an eccentric on the shaft. Steam is admitted through the throttle valve to the inside of the high-pressure valve B; the admission edges marked FF control the time of admission of steam to the high-pressure cylinder, and the exhaust edges GG control the time of the exhaust from the high-pressure cylinder to the receiver D. After the steam has done its work on the high-pressure piston and is exhausted into the receiver D, it enters the body of the low-pressure valve A which controls the ad-

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