STANDARD LUBRICATING OIL SYSTEM FOR GEARED TURBINES. 253 



fied will be required on each turbine. Thermometers in turbine bearings must be 

 protected from gland leak-off steam, so as to avoid false readings. 



C. Gravity Tanks. — i. Two cylindrical gravity or settling tanks shall be located 

 either side of center line of ship at top of engine-room casing. The bottom of 

 tanks shall be 30 feet above center line of turbines. 



2. Each tank shall have a capacity of 600 gallons of lubricating oil, and shall 

 be provided with heating coils for heating oil to 180° F., preparatory to filtering. 



3. Manholes shall be provided to permit accessibility for cleaning. 



4. Gauge glasses about 20 inches long shall be provided at top of both tanks, 

 for observation purposes when filling. 



5. The drain line from gravity tanks shall have a connection, with valves, to 

 an open funnel leading by separate line direct to bilge so that water and sludge 

 may be drained to bilge after settHng either tank preparatory to filtering. 



6. An air vent shall be connected to top of each gravity tank as shown on 

 Drawing E-i 1000-10 (Plate 108). 



D. Reserve or Make-up Tank. — i. One reserve tank of 600 gallons capacity 

 shall be conveniently located as high as possible below main deck in engine-room 

 connected to overflow line leading to drain tank by a pipe with internal connection 

 carried 8 inches above lowest point of tank. 



2. Gauge glasses about 20 inches long and in series, with ends overlapping, 

 shall be provided for reserve tank. 



3. Manholes shall be provided to perimit accessibility for cleaning. 



4. A vent similar to that on gravity tanks shall be fitted and Ij4 inches drain 

 connection to filter shall be taken from bottom of tank. 



E. Drain or Sump Tank. — i. Drain tank shall be separate from ship's struc- 

 ture and located as near as possible to center line of ship, and shall always be located 

 abaft of the gear case. It shall be of sufficient capacity above top of internal suc- 

 tion fitting to hold the oil of one gravity tank plus oil in supply line. Should it be 

 impossible to fit a single tank of required capacity, then two tanks may be fitted 

 with cross-connection and separate vents. 



2. Drain tank shall be provided with two vertical baffle plates equally spaced, 

 which shall extend from within i inch of bottom to about one-third of total depth 

 from drain tank top. 



3. Float shall be provided in drain tank, and shall have indicator fixed to ex- 

 tension on vertical stem leading from float which shall indicate oil level by gradua- 

 tions engraved on pipe or casing enclosing stem, and indicator and piping shall be so 

 arranged that it is easily visible at all times, and at such a height that tank cannot 

 overflow through indicator pipe when vessel is in a seaway. 



4. The suction connection from pumps to drain tank shall be by means of an 

 internal elbow having a bell mouth and extending to within 2 inches of the bot- 

 tom of the tank. The suction shall be taken from the center of after end of the 

 tank, so that any trim of the ship will increase the submersion of suction pipe. 



5. A manhole shall be provided for entering tank and cleaning it, and in the 



