Marine Engineering PracticeChapman & Hall, 1924 - 494 pages |
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Common terms and phrases
adjusted air pump anodes arrangement astern auxiliary Babcock and Wilcox bearings bilge blades bolts bottom burner burning caulking chamber check valve circulating cleaning clearance coal cocks coils combustion compression condenser connected corrosion crank crosshead cylinder diagram doors DRAIN draught efficiency electrolytic ensure evaporator examined exhaust expansion Fahr feed pumps feed water filter fire fitted fuel pump funnel furnace gases gauge gear gland grooves heat heater holes indicator diagram inlet installed joints leakage lever liner liquid fuel lubrication Marine Engineer metal Morite insulated necessary nozzles oil fuel packing passing pipes piston pressure prevent propeller reciprocating engines regulating removed rings rotor rows Royal Navy screw shaft ship shown shows side slide valve space spindle sprayer steam and water steam drum steel STRAINER stroke superheater supply surface Surface Condensing tank temperature thrust block turbine vessels water drum water-tube boilers
Popular passages
Page 432 - ... and expansion have taken place, the steam is exhausted through ports arranged around the center of the cylinder, which are uncovered by the piston at the end of the stroke. The steam has, consequently, a flow in but one direction — hence the derivation of the phrase
Page 44 - As the upper ends of the rear headers are also connected to this drum by horizontal tubes, each section is provided with an inlet and outlet for steam and water. Placed across the bottom of the front headers, and connected thereto by short tubes or nipples, is a forged steel box of square section. This box, being situated in the lowest corner of the bank of tubes, forms a blow-off connection or sediment box through which the boiler can be completely drained. The circulation of water is as follows...
Page 314 - ... or cylinders in which the valve works. These bells are held in position by the end covers and by faces cast on the chest for the purpose. The operation of the valves during a double stroke of the pump is as follows : When the piston is at the bottom of the stroke the main valve is in the right-hand position (see Fig.
Page 328 - Compound gauge for generated steam in shell (i). 24. Cock for compound gauge (23). 25. Pressure gauge for inlet steam to coils (6). 26. Cock for pressure gauge (25). 27. Swing crane bar for door (2). . 28. Eye bolt for. supporting door (2) on crane bar JC7).
Page 43 - By distributing the surface into sectional elements, all danger from unequal expansion due to raising steam quickly, or to sudden cooling, is at once overcome. Each section is made up of a series of straight tubes expanded at their ends into corrugated wrought-steel boxes known as headers. As the headers are staggered, the tubes are so disposed that lanes for the sudden escape of the products of combustion are prevented. The hot gases are therefore completely broken up in their passage across the...
Page 302 - ... is also led into the heater through the non-return valve B on the side of the apparatus. A circular ring and conical spray piece with perforations are fitted to mix the water and steam uniformly. The feed-water is forced by the main engine feed pumps through the spring-loaded valve D on the cover in a thin sheet, and is instantly heated by contact with the steam. As the pressure in the heater...
Page 44 - ... taken by a perforated dry pipe to the stop valve. There is thus a continuous circulation of water in one direction, not hindered by any counter current, and this continuous circulation gives the boiler an equal temperature in all its parts, so that undue strains from unequal temperatures are avoided. The steam and water drum is also fitted with wash plates to prevent undue movement of the water when the ship is rolling. The tubes are of seamless steel. Opposite the end of each tube...
Page 302 - D on the cover in a thin sheet, and is instantly heated by contact with the steam. As the pressure in the heater is generally much less than that of the entering water, the effect of this lowering of the pressure, and sudden heating of the water, is to liberate the air in the water...
Page 44 - ... mixture of water and steam rises to the high end and flows through the uptake headers and horizontal return tubes to the steam and water drum, the path of both water and steam being short and direct ; the water evaporated in the tubes, and that carried along by the...
Page 233 - ... shaft has made a further half revolution, the reflected beam from the other mirror will strike the scale to the left of the zero line. Obviously, the deflection on both sides should be equal. The fixed mirror is attached to one of the flanges (in Fig.