258 STANDARD LUBRICATING OIL SYSTEM FOR GEARED TURBINES. 



degree possible in readiness for the next voyage. Lubricating system should be 

 allowed to run for half an hour after "Finished Signals" is rung down, to cool 

 down bearings, etc., and then all valves, pumps and tanks should be completely shut 

 down and procedure commenced as follows: — 



(a) Open test cock on bottom of gear case to indicate when oil is at maxi- 

 mum height allowed without flooding bearings. Key to this cock to be obtained 

 from chief engineer's room. 



(b) Shut locked cock on main oil drain line at bottom of gear case. Key to be 

 obtained from chief engineer's room. 



(c) Take up floor plate and remove manhole from drain tank. 



(d) Slightly open and regulate valve on supply line to turbines and gears of 

 cleanest tank, gradually lower oil into gear case by an amount not to exceed the 

 height of test cock, and when oil appears at this cock, valve on gravity tank must 

 be instantly closed. 



(e) Open valve on pump discharge line at gravity tank in which oil has just 

 been lowered, and slowly pump up the oil in drain tank into it until drain tank is 

 pumped as low as pump suction will take it. 



(/) Take out remaining oil in drain tank with hand sampling pump if possi- 

 ble. If any remaining oil is good, it can be removed by hand. After getting key 

 from chief engineer's room, open drain cock on bottom of drain tank and drain as 

 much as possible of the remaining oil to bilge. Shut cock and return key to chief 

 engineer's room, and clean bottom of tank out by means of cloths (not cotton 

 waste) and kerosene until all sediment is out and tank wiped dry, when manhole 

 cover is to be replaced. 



(g) Open steam on coil to both gravity tanks until oil is shown at temperature 

 of i8o° F., letting oil remain at this temperature for twelve hours, when steam 

 should be shut off and oil allowed to settle for an additional hour. 



(h) With control valve on drain line to filter closed, and the valve on drain 

 line direct to bilge below funnel open, the drain valve on each tank should be opened 

 one at a time, and water and sludge drained to bilge. When pure oil appears in each 

 case, shut off all drain line valves. 



(i) Open and regulate valve on drain line to filter from one gravity tank, allow- 

 ing oil either to filter continuously or in batches to drain tank, renewing filter cloths 

 when necessary where centrifugal type is not used. In this manner, completely drain 

 off one gravity tank to drain tank and close drain valve. 



(/) Open up pump discharge valve at gravity tank just filtered. Start up 

 pump, and pump as much of this oil as suction will allow, back to tank. 



(k) Repeat above process with second tank, as per paragraphs (i) and (/). 



(/) Now open cock on bottom of gear case and allow oil to flow to drain tank. 



(m) Shut cock again. 



(n) Open up valve on supply line at bottom of one of gravity tanks, and allow 

 filtered oil to flow through gears until at level of test cock, when valve on gravity 

 tank must be immediately closed. 



