A Manual of Marine Engineering: Comprising the Designing, Construction, and Working of Marine Machinery

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C. Griffin, 1886 - Marine engineering - 479 pages
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Page vi - PREFACE TO THE SECOND EDITION THE demand for a second edition of this work within three...
Page 2 - The ratio of expansion, also called the number of expansions, is the ratio between the volume of steam in...
Page 422 - To be added when the boiler is of such a length as to fire from both ends, or is of unusual length, such as flue boilers ; and the circumferential seams are fitted as described opposite P, R, and...
Page 415 - It is to be capable of being bent to a curve, of which the inner radius is not greater than one and a half times the thickness of the plates or bars, after having been heated uniformly to a low cherry-red and quenched in water of 82 F.
Page 426 - When a superheater is constructed with a tube subject to external pressure the working pressure should be ascertained by the rules given for circular furnaces, but the constants should be reduced as 30 to 47. In all cases the internal steam pipes should be so fitted that the steam in flowing to them will pass over all the plates exposed to the impact of heat or flame. Superheaters should, as regards survey, be deemed to be the most important...
Page 415 - The material to stand bending hot to an angle of 90, over a radius not greater than lj time the thickness of the plates. General Remarks about Boilers under Construction.- — The surveyors will be guided in fixing the working pressure by the tables and formulae annexed. Any novelty in the construction of the machinery or boilers to be reported to the Committee. The boilers, together with the machinery, to be inspected at different stages of construction. The boilers to be tested by hydraulic pressure,...
Page 427 - ... but strips cut from furnaces, combustion boxes, &c., should be heated to a cherry red, then plunged into water of about 80 and kept there until of the same temperature as the water, and then bent. The bending strips should not be less than 2 inches broad and 10 inches long, and they should...
Page 442 - Tables opposite the boiler pressure intended, but in no case should the valves be less than two inches in diameter. This applies to new vessels or vessels which have not received a passenger certificate. When, however, the valves are of the common description, and are made in accordance with the...
Page 289 - IHP indicated thrust is — — -. -. — : pitch x revolutions. When decomposed into its constituent parts indicated thrust is resolved into several elements, which must be enumerated and kept in view. These elements are: 1, the useful thrust or ship's true resistance; 2, the augment of resistance, which, as I have pointed out in many...

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