254 STANDARD LUBRICATING OIL SYSTEM FOR GEARED TURBINES. 



vertical baffle plates lightening holes of manhole size shall be cut to clean out all 

 compartments, and so staggered as not to interfere with baffling effect. 



6. Drain pipe from bearings and gear case shall be led with an easy drop to the 

 top, or as near the top of the drain tank as possible ; oil drains from turbine bear- 

 ings must not be led into the base of the gear case. 



7. A hand pump for the purpose of sampling oil from the bottom of drain tank 

 shall be provided. 



8. Drain tank to be vented by goose-neck pipe extending at least to a height 

 equal in elevation to center line of turbine. 



9. Drain tank shall be fitted with small cock as near bottom as possible, to drain 

 off bottom oil to bilge, when tank is to be cleaned out, and it shall have handle 

 kept in chief engineer's room. Cock shall be marked with plate as follows : — "This 

 cock only to be used when cleaning drain tank and cock to be shut and handle re- 

 turned to chief engineer's room when cleaning is finished." 



F. Lubricating Oil Pumps. — i. A duplex lubricating oil pump and an auxiliary 

 pump of the same size shall be placed in such a location as to permit of a suction 

 head not exceeding 2 feet. They shall conform to the following specifications : — 



Size 7^/2 by 7 by 10 inches duplex, preferably of the vertical type ; pumps of 

 other dimensions, but with equivalent capacity, may be used. Pumps shall be de- 

 signed to operate from the auxiliary steam line at reduced pressure, but the steam 

 ends must be tested hydrostatically for full boiler pressure. 



Pumps shall have: — Brass valves, cast-iron plunger, and steel pump rods. Cast- 

 iron snap rings on piston and plunger. Steam and oil piston rods packed with me- 

 tallic packing. Steam cylinders lagged, and covered with sheet metal neatly fitted. 

 Paper packing on all joints. No liner in the oil end of the pump. Both suction and 

 discharge connections of the flange type, and the dimension shall conform with the 

 American standard. 



G. Oil Coolers. — i. Two oil coolers shall be provided, each capable of cooling 175 

 gallons per minute of lubricating oil (having a viscosity of 500 seconds Saybolt 

 at 100° F.) from 130° F. to 110° F., with cooling water at 70° F. The drop in oil 

 pressure through the cooler shall not exceed 1 5 pounds per square inch. The drop 

 in water pressure through the cooler shall not exceed 5 pounds per square inch. 



2. Coolers shall be located below light load water line if possible. 



3. Piping arrangement shall permit of by-passing from one cooler to the other, 

 or from both coolers direct to gravity tanks. 



4. At the lowest point of the water head on each cooler there shall be placed a 

 drain discharging into an open funnel. When ship is in port, this drain shall be 

 opened so that all of the water will be removed from the cooler and discharged 

 through a funnel to the bilge. By leaving this drain open while in port, any leak 

 or defective tube will be shown by oil dripping into the funnel. 



5. Cooling water shall be supplied by a separate circulating pump with an emer- 

 gency connection to an intermittent service pump other than the sanitary pump, 

 having a direct connection to sea, but means must be provided to insure through 



