MARINE ENGINES.
SOI
i ft. 9 in. Diameter of feed and bilge pumps (two of each) 6 in.,stroke i ft. 9 in.
There are four Boilers , each 9 ft. 7 in. in length, and 11 ft. 6 in.diameter. Each boiler has three furnaces, of 3 ft. diameter. Thetotal heating surface is 5140 sq. feet. Pressure 70 lbs.
The diameter of the screw propeller is 16 ft. 6 in., the varyingpitch 24 ft. to 27 ft.
The feed steam pumps, of which there are two, have each acylinder of 8 inches diameter and 9 inches stroke, driving a double-acting pump 4 inches in diameter. They are arranged to drawwater from either the sea or the bilges, and to discharge into theboilers, on deck, or into the sea, as may be desired. There is alsoa bailast steam pump, with a cylinder 7 inches in diameter and astroke of 9 inches, driving a double-acting pump of 9 inches indiameter, which draws the water from the fore and aft baliastcompartments. A double-acting hand pump is also provided,having a diameter of 7 inches and a stroke of 15 inches, which canalso be worked from the main engines.
The Itata has a length over all of 305 ft., breadth of beam 40 ft.,and depth under main deck of 19 ft. 6 in. The average consump-tion of fuel during a voyage of this ship from Liverpool toValparaiso was only roc>7 ton per hour of steaming, and taking theindicated horse-power as 3% times the nominal horse-power, wehave a coal consumption of under 2 lbs. per indicated horse-power.
SCREW STEAMSHIP “SIR BEVIS.” Tonnage 919 b.m.
See Figs. 376, 377, 378, pages 502-504.
The Engines, of 115 nominal horse-power, have one high-pressurecylinder 2 ft. 2 in. diameter, and one low-pressure cylinder 4 ft. 4 in.diameter; length of stroke 3 ft. The surface condenser has 944tubes, 6 ft. long and in. diameter; condensing surface of tubes1112 sq. feet.
The Boilers are cylindrical, with a total heating surface of 1982sq. feet; area of fire grate 65 sq. feet. Steam pressure in boiler60 lbs. per sq. inch.
The diameter of the screw propeller (four-bladed) is 13 ft. 4 in.,the varying pitch 16 ft. to 18 ft. The Sir ßevis has a length overall of 210 ft., breadth of beam 30 ft., depth 17 ft.