STANDARD LUBRICATING OIL SYSTEM FOR GEARED TURBINES. 257 



eluding pumps, strainer, coolers and piping full and level of oil in drain tank just 

 above top of horizontal pipe connecting to internal suction fitting, and other gravity 

 tank full to overflow pipe. 



3. Care of strainers. — When the strainer in use has to be cleaned, and it is 

 necessary to change over, the dirty basket shall be removed and replaced by a clean 

 spare immediately, or if no spare is available the dirty basket shall be thoroughly 

 cleaned and replaced, and in either case the cover shall be left open until the re- 

 placement is made. This precaution will reduce the liability of dirty oil being sup- 

 plied to the turbines and gears by a quick change over to the side of the strainer 

 from which the basket has been removed. 



4. Rimfying zvhen running. — This can be accomplished by observing the fol- 

 lowing procedure : — 



(o) Open valve on supply line to turbines and gears on gravity tank which 

 contains purified oil. 



(b) Shut valve on supply line to turbines and gears on gravity tank which has 

 dirty oil and has just been in use. 



(c) Open valve on pump discharge line to gravity tank which has just been 

 cut in. 



(d) Close valve on pump discharge line to gravity tank which has just been 

 cut out. 



(e) Turn steam on dirty oil tank and heat oil to a temperature of 180° F. for 

 twelve hours. Steam can now be shut off coils and oil allowed to settle for an addi- 

 tional hour. 



(/) Close all drain valves on both gravity tanks and the one on drain line to 

 filter. 



(g) Open valve to open funnel on drain line direct to bilge, and let water and 

 sludge run off until clean oil appears, when both these valves are to be shut. Gravity 

 tank is then ready for cutting in on system when required. 



(h) Repeat process with other gravity tank when necessary. 



5. Filtration. — ^Continuous or batch filtration should be used as much as possi- 

 ble, and should be carried out on gravity tank which is in service and running on 

 the system. It must be clearly understood that this process is really filtering a por- 

 tion of the working oil in the whole system. Filtering elements should have cloths 

 renewed at suitable periods to be determined by running conditions. The process 

 is as follows: — 



(a) Open drain to filter line, open drain below tank, and gradually regulate 

 oil so as to slowly flow to filter when continuous filtration can be carried on as per 

 instructions provided by manufacturers of filtering apparatus. 



(&) If the ship is rolling heavily then batch filtration can be carried on, for 

 which manufacturer's instructions are also provided, depending on type of filter. 



(c) When tanks are changed over, the other tank will then be filtered as above. 



6. Purifying when vessel is in port and turbines shut dozvn. — Upon ship's 

 arrival in port, attention should be turned to purifying lubricating oil to the highest 



