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TANT FEED 6 TOR ETC. PUMP ENGINES. Length of Blades. i Diameter In first In last Turbines. of rotor. expansion. expansion. iP. 96 in. 234 in. 12% in. LP: 140 in. 8% in. 22°. ih. Astern 104 in. 2A in. Oo in. Total cooling surface, main condensers, 82,800 sas: it: Area of exhaust inlet, 158 sq. ft. Bore of circulating discharge pipes, 32 in. Diameter of tunnel shafts, 20 in. external, 10 im Hole: Diameter 10 in. of propeiier shafts, 22 in. external, hole. BOILERS. Working pressure, 195 lbs. 23 double-ended boilers, diam. by 22 ft. long. 2 single-ended boilers, 17 ft. by li: ft. ©4 in. long. Total number of furnaces, 192. Total grate surface, 4,048 sq. ft. Total heating surface, 158,252 sq. ft. Total length of boiler rooms, 336 ft. Total length of main and auxiliary rooms, 149 ft. 8 in. With regard to the running of this large machinery and boiler installation, it may be of interest to members to give detailed particulars of the forced lubrication system, and of the system of feed heating and supply to the boil- ers. Each of.these systems demanded that adequate provision be made to per sds an: I? ft. 6 sine mean: 6 in. mean diam. engine Fig. 3 DIAGRAM OF FORCED LUBRICATION SYSTEM. TURBINE TAE Marine REVIEW Pig 2. ARRANGEMENT OF BOILER ROOMS, rT FEEO & EJECTOR ETC. PUMP possible thus enable the engineers in charge to be free to attend to the numberless duties connected with the supply of electric power and lighting, the sup- ply of hot and cold, fresh and salt water throughout the ship, the pump- meet. all contingencies, and ing of the bilge and of the ballast compartments, and last, but not least, the supervision of the large army of stokers or firemen and trimmers, and the regulation and distribution of the coal supply from the various bunk- ers. Regarding the forced lubrication sys- tem, of which a diagrammatic sketch is given in Fig. 3, the following state- ment gives the weights of the various revolving parts, together with the size FEEDS €TC PuMP 23 A large main drain or reservoir. tank is placed amidships low down in the engine room, in such position that the oil from all the bearings readily flows into it; the oil is pumped from. this tank by four direct-acting single-cylin- der pumps, through a system of filters, to gravitation tanks placed in . the engine room casings about 26 feet above the bearings. These tanks are of, sufficient capacity to maintain the oil supply to the bearings for 10 or 11. minutes after the complete stop- page of all the pumps. There is a separate and distinct system of supply and gravitation pipes to the bearings on each side of the ship, with cross connections, so that, in the event of any defect arising on one side, it can of bearings and the pressure on same:- be at once shut off, and the whole sup- Weight of one H. P. turbine rotor complete, 86 tons. Weight of one L. P. turbine rotor complete, 120 tons. Weight of one Astern turbine rotor complete, 62 tons. Main Bearing Journals. Pressure At 190 revs. Diameter. 27% in. 33% in. 24% in. Pe i P. Rotor Astern Rotor - woe eee ree o ere eee AIR PIPE ~ GRAVITATION & COOLING TANK FILTERS OIL RESERVOIR TANK Effective length. bearing surface. surface speed of journal. 1,350 ft. per min. 1,650 ft. per min. 1,200 ft. per min. per sq. in. of 80 lbs. 72 Ibs. 83 lbs. 4434 iin. 56% in. 3434 in. ply to all the turbines directed through the other side. Gages showing the pressure in the oil pump discharges to the filters, and also the pressure in the gravitation pipes to the main bear- ing journals and thrusts, are fitted up at the starting platform as well as at the pumps, these latter being placed in an easily accessible part of the center engine room. A pressure gage is also. fitted at each bearing, and, in addition, the drain or discharge from. the bot- tom reservoir from each bearing and thrust is led through a_ glass-sided lantern-shaped_ receiver, so as _ to make the flow visible, and a thermom- eter fitted up at this point enables the temperature of the oil from each of the 12 main bearings and four thrust blocks to be taken and recorded, the practice being to log the temperature hourly. In the gravitation tanks are placed copper coils of a total surface of 1,335 square feet, through which cold sea water is circulated, and this-