Allis Chalmers Lube Oil
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Allis Chalmers Lube Oil

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A discription of a 1940's era Allis Chalmers Steam Turbine Lube Oil System

A discription of a 1940's era Allis Chalmers Steam Turbine Lube Oil System

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Allis Chalmers Lube Oil Document Transcript

  • 1. Steam Turbine Controls Consulting JOSEPH F. BYRD, JR., INC. PO Box 52 Dunn, NC 28335 PH: (910) 658-1291 byrdj@asme.org Allis Chalmers Lube Oil System The figure is “As described”. The basis of the drawing is from Figure 33: Steam Turbines, A Book of Instruction for the Adjustment and Operation of the Principal Types of this Class of Prime Movers by Hubert E. Collins, 1909. The steam driven auxiliary oil pump supplies oil to the tee handle adjustable Oil Controlling valve. This relief sets the Relay pressure with excess oil dumped into the Bearing header. There are dual shaft driven oil pumps with one supplying Relay and the other Bearing pressure. The pumps are above tank oil level. The discharged check valves are drill to allow aux oil to wet the gears and prime. The oil pressure regulator controls steam to the auxiliary oil pump to maintain Bearing pressure during startup and relives to control the bearing header pressure (dumping back to the oil tank) when shaft driven is in service. FOR REVIEW AND DISCUSSION ONLY
  • 2. Steam Turbine Controls Consulting Page 2 JOSEPH F. BYRD, JR., INC. Allis Chalmers oil pressure regulator FOR REVIEW AND DISCUSSION ONLY
  • 3. Steam Turbine Controls Consulting Page 3 JOSEPH F. BYRD, JR., INC. Refer to drawing 613-00615 for item number identification The area under the blue piston (35) would be the Bearing Header sensing. With no bearing oil pressure, the blue piston will slide down due to the red spring and weight. This will “close over travel” the relief ports (39) in the yellow cylinder bushing (37). The green relay valve (5) will follow the piston down and “open over travel” the drain port (20) in the purple piston (13). Oil pressure under the purple piston (13) provides the force to close the steam valve. With the relay valve (5) draining, the oil pressure around the upper piston lip and steam pressure under its valve (7) will force the purple piston down (13) and allow the steam valve (7) to open. As bearing oil pressure builds up under the blue piston (35) for sufficient force to overcome the weights, it will compress the spring and rise, lifting the green relay valve (5), but the yellow relief ports (39) will still be in “closed over travel”. When the green relay (5) valve closes the purple drain ports (20), oil pressure will lift the purple piston (13) to close the steam valve (7). The purple piston (13) will follow the relay valve (5) movements to trying to keep port (20) on “null”. Once the bearing oil pressure under the blue piston (35) is about 50% of controlling range, the purple piston (13) should have the steam valve (7) closed. If the pressure increases greater, the relay valve (5) will “close over travel” and keep full pressure on the purple piston (13), keeping the steam valve (7) closed. As the bearing oil pressure increases greater than 50% of controlling range, the blue piston (35) will lift until the relieving ports (39) open and dump oil to maintain the bearing header pressure The weights, instead of a large spring hold the bearing header pressure within a fairly narrow range. Observing that the weights are not at either full bottom of top shows the regulator pressure setting. The lower stroke of the weights will be stroking the piston for the steam valve 0-100%. The upper stroke of the weights stroke will be lifting the bearing header relief valve. If the weights are at hard top during operation at speed, which implies the bearing header pressure is greater than it should be. This is where setting the “tee handle” comes in, but I don’t think the results will be that straight forward since adjusting bearing header should also change relay pressure in the opposite direction. Adjusting the “tee handle” down with the steam driven pumping should increase the relay while the bearing header only goes down a little bit. Adjusting the “tee handle” down with the main pumps at speed should lower bearing header and lower the weight, but I don’t know if that will raise relay too much. If you adjust the “tee handle” too much, the steam valve would open, so you want the weights not on the top, but not low enough to open steam valve FOR REVIEW AND DISCUSSION ONLY
  • 4. Steam Turbine Controls Consulting Page 4 JOSEPH F. BYRD, JR., INC. The stroke of the steam valve can be increased by moving center link away. This will increase the gain of the loop and my require adding damping for stability. Throttling valve 29 will slow down how fast the steam valve will open some. This is relay oil that is always pushing the piston down. Closing is determined by the relay valve draining the oil from under the piston. I would want this left as fast as possible since it would start the steam driven if needed. Throttling valve 31 will slow down how fast the steam valve will close. This is relay oil that is supplied under the piston, there is an orifice drain in the piston so if 31 is throttled too much, the piston will not open fully to close the steam valve. Throttling valve 32 will damping the bearing header oil pressure signal that the regulator is trying to control. □ FOR REVIEW AND DISCUSSION ONLY
  • 5. ';( -:--V :au; Ott. 1. Valve body 11. Link 21. Spring 31. Valve assembly 39. Port 2. Cylinder 12~ Lever 22. Strut 32. Needle valve 40. Steam valve bo( 3. Indicator 13. Piston 23. Oil return chamber 33. Bearing oil inlet 41. Valve seat 4. Bushing 14. Set screw 24. Cover 34. Oil return to tank 42. Steam outlet 5. Relay valve 15. Weight 25. Drain connection to oil tank 35. Piston 43. Pin 6. Steam leak-off 16. Weight pan 26. Diaphragm 36. Available bearing oil 7. Valve stem 17. Special pin 27. Drain inlet connection 8. Rod end 18. Cover 28. Relay oil inlet 37. Cylinden bushing 9. Link 19. Packing 29. Needle valve 38. Bearing;6il inlet 10. Flange 20. Port 30. Needle valve nonnection &AM TURBINE 'g. 613-00615 lIUS..(HIIMlli MANUfi(llIRI"'6 (OMPANY oto 132744, 132743 MILWAUKEE, WISCONSIN Page _ FOR REVIEW AND DISCUSSION ONLY