Method and apparatus for analyzing the operating condition of a machine

• US 5,112,196 A
• Filed: 12/21/1990
• Issued: 05/12/1992
• Est. Priority Date: 12/21/1990
• Status: Expired due to Term

• Current Assignee: BMA Investments Ltd. (British Medical Association)
• Original Assignee: Wood Group Asset Integrity Solutions, Inc. (John Wood Group PLC)
• Inventors: Schuh, David N.
• Primary Examiner(s): Bertsch, Richard A.
• Assistant Examiner(s): FREAY, CHARLES GRANT
• Application Number:
  US07/631,872
• Time in Patent Office: 508 Days
• Field of Search: 417/63, 417/53, 73/4 R, 73/37
• US Class Current: 417/63
• CPC Class Codes: F04B 2201/0201 Position of the piston
• CPC Class Codes: F04B 2201/0205 Piston ring wear
• CPC Class Codes: F04B 2201/0208 Leakage across the piston
• CPC Class Codes: F04B 2201/0605 Leakage over a valve
• CPC Class Codes: F04B 2201/1208 Angular position of the shaft
• CPC Class Codes: F04B 2205/09 Flow through the pump
• CPC Class Codes: F04B 51/00 Testing machines, pumps, or pumping installations
• CPC Class Codes: G01M 13/005 Sealing rings
• CPC Class Codes: G01M 3/2876 for valves G01M3/30 takes precedence

Abstract

A method and apparatus for analyzing the operating condition of a machine, such as a reciprocating compressor (10), is provided. The method comprises testing for fluid flow across the closed suction and discharge valves (30-33), as well as leakage across the piston (16), when the machine is in a non-operating condition. The test apparatus may be removable attached externally to the machine by connection to the Kiene head end indicator cock (22) and the crank end indicator cock (24) or the apparatus may be built in internally of the machine.

Claims

1. A machine, comprising

a piston mounted for reciprocating movement in a cylinder;

a pressure activated valve movable between an open position and a closed position for controlling fluid flow between the interior and the exterior of the cylinder; and

means operative when the valve is in the closed position for measuring fluid flow across the valve.

2. The machine according to claim 1, wherein said fluid flow measuring means is located externally of the machine and is detachable therefrom.

3. The machine according to claim 1, wherein said fluid flow measuring means is located internally of said machine.

4. The machine according to claim 3, wherein said fluid flow measuring means comprises a second valve located in a passage between the interior and the exterior of the cylinder, and means for measuring fluid flow through said passage when said second valve is open.

5. The machine according to claim 4, further comprising an orifice in said passage and wherein the means for measuring fluid flow through said passage comprises connection means to opposite sides of said orifice for measuring a pressure differential across said orifice.

14. The machine according to claim 1, further comprising means operative when the piston is in a stationary condition for measuring fluid flow across the piston between the head and crank ends.

15. The machine according to claim 14, wherein said means for measuring fluid flow across the piston comprises said means for measuring fluid flow between the interior and the exterior of the cylinder.

6. A machine, comprising:

a piston mounted for reciprocating movement in a cylinder;

a pressure activated valve movable between an open position and a closed position for controlling fluid flow between the interior and the exterior of the cylinder; and

means operative when the valve is in the closed position for measuring fluid flow from the interior to the exterior of the cylinder.

7. The machine according to claim 6, wherein said fluid flow measuring means is located externally of the machine and is detachable therefrom.

8. The machine according to claim 6, wherein said fluid flow measuring means is located internally of said machine.

9. The machine according to claim 8, wherein said fluid flow measuring means comprises a second valve located in a passage between the interior and the exterior of the cylinder, and means for measuring fluid flow through said passage when said second valve is open.

10. The machine according to claim 9, further comprising an orifice in said passage, and wherein the means for measuring fluid flow through said passage comprises connection means to opposite sides of said orifice for measuring a pressure differential across said orifice.

11. The machine according to claim 10, wherein said second valve is biased to a closed position and further comprising means for opening said second valve from a location remote therefrom.

12. The machine according to claim 11, wherein said connection means comprises first and second ports for connection to a pressure difference meter, said ports, respectively, being in communication with locations on opposite sides of said orifice.

13. The machine according to claim 12, wherein said means for opening said second valve comprises a diaphragm operatively connected to said valve and a pressure inlet port for subjecting one side of said diaphragm to a pressure source.

16. A reciprocating compressor, comprising:

a cylinder having a head end and a crank end;

a piston mounted for reciprocating movement in the cylinder between the head end and the crank end;

a suction bottle connected to the interior of the cylinder through a suction manifold;

a discharge bottle connected to the interior of the cylinder through a discharge manifold;

a head end suction valve and a crank end suction valve for the inflow of fluid into the cylinder;

a head end discharge valve and a crank end discharge valve for the outflow of fluid from the cylinder; and

means operative when said suction valves and said discharge valves are closed for measuring fluid flow from the interior to the exterior of the cylinder.

17. The compressor according to claim 16, wherein said fluid flow measuring means comprises means for connecting the head end of the cylinder to the suction bottle and means for measuring fluid flow between the head end and the suction bottle.

18. The compressor according to claim 17, wherein said fluid flow measuring means further comprises means for connecting the crank end to the suction bottle and means for measuring fluid flow between the crank end and the suction bottle.

19. The compressor according to claim 16, wherein said fluid flow measuring means comprises means for pressurizing the head end of the cylinder and means for connecting the suction bottle to a lower pressure and means for measuring fluid flow between the suction bottle and said lower pressure.

20. The compressor according to claim 19, wherein said means for pressurizing the head end of the cylinder comprises means for connecting the head end of the cylinder to the discharge bottle.

21. The compressor according to claim 20, wherein said measuring means further comprises means for pressurizing the crank end of the cylinder.

22. The compressor according to claim 21, wherein said means for pressurizing the crank end of the cylinder comprises means for connecting the crank end of the cylinder to the discharge bottle.

23. The compressor according to claim 16, wherein said fluid flow measuring means comprises a secondary valve associated with each of said head end suction, crank end suction, head end discharge and crank end discharge valves and operative between the interior of the cylinder and said suction and said discharge manifolds, respectively.

24. The compressor according to claim 23, wherein each of said secondary valves is located in a passage and including an orifice inset passage and connection means to opposite sides of said orifice for measuring a pressure differential across said orifice.

25. The compressor according to claim 24, wherein each of said secondary valves is biased to a closed position and further including means for opening each said second valve from a location remote therefrom.

26. The compressor according to claim 25, wherein said connection means comprises first and second ports for connection to a pressure difference meter, said ports, respectively, being in communication with locations on opposite sides of said orifice.

27. The compressor according to claim 26, wherein said means for opening said second valve comprises a diaphragm operatively connected to said valve and a pressure inlet port for subjecting one side of said diaphragm to a pressure source.

28. The compressor according to claim 16, further comprising means operative when the piston is in a stationary condition for measuring fluid flow across the piston.

29. The compressor according to claim 28, wherein said means for measuring fluid flow across the piston comprises means for pressurizing the head end of the cylinder and means for connecting the crank end of the cylinder to the suction bottle and means for measuring fluid flow between the crank end of the cylinder and the suction bottle.

30. The compressor according to claim 29, wherein said means for measuring fluid flow across the piston further comprises means for pressurizing the crank end of the cylinder and means for connecting the head end of the cylinder to the suction bottle and means for measuring fluid flow between the head end of the cylinder and the suction bottle.

31. A method of analyzing the operating condition of a machine which has a piston mounted for reciprocating movement in a cylinder and a pressure activated valve movable between an open position and a closed position for controlling fluid flow between the interior and the exterior of the cylinder, which method comprises the steps of placing the machine in an inoperative condition and measuring fluid flow across the valve with the valve in the closed position.

32. A method of analyzing the operating condition of a machine which has a piston mounted for reciprocating movement in a cylinder and a pressure activated valve movable between an open position and a closed position for controlling fluid flow between the interior and the exterior of the cylinder, which method comprises the steps of placing the machine in an inoperative condition and measuring fluid flow between the interior and the exterior of the cylinder with the valve in the closed position.

33. The method according to claim 32, further comprising the step of measuring fluid flow across the piston.

34. A method of analyzing the operating condition of a reciprocating compressor, which has a cylinder having a head end and a crank end, a piston mounted for reciprocating movement in the cylinder between the head end and the crank end, a suction bottle connected to the interior of the cylinder through a suction manifold, a discharge bottle connected to the interior of the cylinder through a discharge manifold, a head end suction valve and a crank end suction valve for the inflow of fluid into the cylinder, and a head end discharge valve and a crank end discharge valve for the outflow of fluid from the cylinder, which comprises the steps of placing the compressor in an inoperative condition and measuring fluid flow between the interior and the exterior of the cylinder.

35. The method according to claim 34, wherein said fluid flow is measured by connecting the head end of the cylinder to the suction bottle and measuring fluid flow between the head end and the suction bottle.

36. The method according to claim 35, wherein said fluid flow is further measured by connecting the crank end to the suction bottle and measuring fluid flow between the crank end and the suction bottle.

37. The method according to claim 34, wherein said fluid flow is measured by pressurizing the head end of the cylinder, connecting the suction bottle to a lower pressure and measuring fluid flow between the suction bottle and said lower pressure.

38. The method according to claim 37, wherein said pressurizing the head end comprises the step of connecting the head end to the discharge bottle.

39. The method according to claim 38, wherein said fluid flow is further measured by pressurizing the crank end of the cylinder and measuring fluid flow between the suction bottle and said lower pressure.

40. The method according to claim 34, further comprising the step of measuring fluid flow across the piston.

41. The method according to claim 40, wherein said measuring of fluid flow across the piston comprises the steps of pressurizing the head end of the cylinder, connecting the crank end of the cylinder to the suction bottle and measuring fluid flow between the crank end of the cylinder and the suction bottle.

42. The method according to claim 41, wherein said pressurizing the head end comprises the step of connecting the head end to the discharge bottle.

43. The method according to claim 41, wherein said measuring fluid flow across the piston further comprises the steps of pressurizing the crank end of the cylinder, connecting the head end of the cylinder to the suction bottle and measuring fluid flow between the head end of the cylinder and the suction bottle.

44. A machine, comprising:

a cylinder having a head end and a crank end;

a piston mounted for reciprocating movement in the cylinder between the head end and the crank end; and

means operative when the piston is in a stationary condition for measuring fluid flow across the piston between the head end and the crank end.