STANDARD LUBRICATING OIL SYSTEM FOR GEARED TURBINES. 259 



(o) Pump up oil in drain tank to partly filled gravity tank which should again 

 fill it. 



(p) Open up drain valve at bottom of this gravity tank and allow oil to flow 

 through filter to drain tank and close drain valve again. 



(q) Pump all oil in drain tank up to empty gravity tank. 



(r) Open cock on bottom of gear case and allow oil to run into drain tank lock- 

 ing cock open, and returning key to chief engineer's room ; close test cock and re- 

 turn its key to chief engineer's room also. This is important. 



(s) System is now ready to operate with pure oil for another voyage. 



K. Limitation of System. — i. After the oil system is in operation and turbines 

 running, it is to be noted that the oil system is not absolutely automatic in the fol- 

 lowing points: — 



(a) Gravity tanks. — Supply line control valves. Valves controlling gauge 

 board indicator pipes. (All to be operated by hand when changing over from one 

 tank to the other.) 



Operating heating coils, drains and water sludge valves when settling the grav- 

 ity tank with system closed off. 



(b) Turbines and gears. — Regulating supply from gravity tank and valves (if 

 fitted) at turbine manifolds. 



(c) Oil pumps. — Changing from main to auxiliary oil pumps. Regulating 

 speed of pumps by control valves. 



{d) Strainer. — The strainer requires hand operation to change sides so as to 

 use a clean instead of a dirty basket. It also requires immediate replacement of a 

 dirty basket by a clean one, when the former is removed. 



{e) Coolers. — Opening up cooler or coolers on line or by-passing coolers. 

 Changing from one oil cooler to another, by-passing both or putting both into 

 operation. 



(/) Filter. — Operating filter on batch or continuous system or cutting filter in 

 or out. Operating drain or filter and adjusting water overflow, etc. Cleaning filter 

 cloths. 



{g) Pipe line. — Operating valve on pump discharge line controlling discharge 

 of badly emulsified oil from drain tank to bilge. 



(/j) Filling. — Operating valves for filling from deck. 



{i) Reserve tank. — Operating valves controlling reserve supply for make up oil. 



L. Application of Standard System to Installations Other than 2,500 to 3,000 

 S. H. P. Single-Screw Units : — 



I. Single-screzv installation. — The standard system is intended for use on all 

 double reduction geared units from 2,500 to 3,000 horse-power in capacity, whether 

 single or compound turbines are used. For single reduction geared units which re- 

 quire less oil, or for sizes smaller or larger than those given above, the size of tanks 

 and the capacity of the system throughout shall be arranged, in the same proportion 

 as the standard system, on the amount of oil per minute required by the unit se- 

 lected, e. g., a turbine unit requiring a circulation of 87^ gallons of oil per minute 



