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 448 - A passenger steamer shall be provided with a safety valve on each boiler, so constructed as to be out of the control of the engineer when the steam is up, and, if...
Page viii - PREFACE TO THE SECOND EDITION THE demand for a second edition of this work within three...
Page 417 - Strips cut lengthwise or crosswise of the plate to have an ultimate tensile strength of not less than 26, and not exceeding 30 tons per square inch of section, with an elongation of 20 per cent in a length of 8 inches.
Page 420 - Width of combustion box in inches. P = Pitch of supporting bolts in inches. D = Distance between the girders from centre to centre in inches. L = Length of girder in feet. d = Depth of girder in inches. T = Thickness of girder in inches. C = 500 when the girder is fitted with one supporting bolt.
Page 422 - When cylindrical boilers are made of the best material with all the rivet holes drilled in place and all the seams fitted with double butt straps each of at least five-eighths the thickness of the plates they cover, and all the seams at least double riveted with rivets having an allowance of not more than 75 per cent.
Page 426 - The length to be measured between the rings if the furnace is made with rings. If the longitudinal joints, instead of being butted, are lap-jointed in the ordinary way, then 70,000 is to be used instead of 90,000, excepting only where the lap is bevelled and so made as to give the flues the form of a true circle, when 80,000 may be used. When the material or the workmanship is not of the best quality, the constants given above must...
Page 430 - The rivet holes in the furnaces and longitudinal seams of cylindrical shells should be drilled, but if it is wished to punch them and afterwards bore or anneal the plates in a proper furnace, the particulars of the punching and boring or annealing should be submitted to the Board of Trade for consideration before being done, but all punched holes should be made after bending. In all cases where assent has been given for plates to be punched after bending and then annealed...
Page 317 - Therefore the best chimney draught takes place when the absolute temperature of the gas in the chimney is to that of the external air as 25 to 12.
Page 428 - 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 429 - The Surveyor is not obliged to witness the foregoing tests, although it is very desirable that he should when his other duties will allow him to do so, but he should, however, select at least one in four of these plates, either at the steel works or the boilermakers' works, and witness the testing of at least one strip cut from each selected plate.

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