System and method for power pump performance monitoring and analysis

• US 6,882,960 B2
• Filed: 02/21/2003
• Issued: 04/19/2005
• Est. Priority Date: 02/21/2003
• Status: Active Grant

• Current Assignee: MHWirth GmbH (Akastor ASA)
• Original Assignee: Miller J. Davis
• Inventors: Miller, J. Davis
• Primary Examiner(s): Hoff, Marc S.
• Assistant Examiner(s): SUAREZ, FELIX E
• Application Number:
  US10/373,266
• Publication Number:
  US 20040167738A1
• Time in Patent Office: 788 Days
• Field of Search: 702/150, 702/175, 702/177, 702/179, 702/182, 702/183, 702/74, 702/91, 702/104, 702/188, 702/189, 175/24, 417/43, 700/90
• US Class Current: 702/182
• CPC Class Codes: F04B 51/00 Testing machines, pumps, or pumping installations

Abstract

A power pump performance analysis system includes a signal processor connected to pressure sensors for sensing pressures in the cylinder chambers and inlet and discharge piping of a single or multi-cylinder pump. Pump speed and piston position are determined by a crankshaft position sensor. Pump vibration, fluid temperatures, and power input may also be measured by sensors connected to the processor. Performance analyses, including determination of pump volumetric efficiency, mechanical efficiency, suction and discharge valve sealing delay, valve and piston seal leakage, flow induced pressure variations, acceleration induced pressure detection, hydraulic resonance detection and pulsation dampener performance may be measured and selected parameters displayed on a visual display connected to the processor directly or via a network.

Claims

1. A performance analysis system for analyzing selected performance parameters of a pump system including a reciprocating piston power pump having at least one reciprocating piston operable to displace fluid from a housing having a pumping chamber, said analysis system comprising:

a piston displacement position sensor operable to sense movement of said piston for determining a position of said piston;

a pressure sensor operable to sense pressure in said chamber;

a signal processor operably connected to said sensors for receiving signals therefrom and for generating information corresponding to at least one performance parameter selected from a group consisting of delay in opening or closing of one or more valves for admitting fluid to and discharging fluid from said chamber, pressure variation indicative of a leakage condition of a piston seal, maximum and minimum chamber pressure, pump volumetric efficiency and pump fluid flow rate; and

means for displaying said at least one performance parameter.

2. The analysis system set forth in claim 1 including:

a display produced by said processor illustrating one or more pump fluid discharge performance parameters selected from a group consisting of pump discharge pressure, total peak-to-peak pressure variation, fluid flow peak-to-peak variation, percent of peak-to-peak flow induced pressure variation and pump volumetric efficiency.

3. The analysis system set forth in claim 1 including:

a display produced by said processor showing at least one performance parameter selected from a group consisting of a discharge valve seal delay, piston seal pressure variation, and suction valve seal delay, as a function of piston position.

4. The analysis system set forth in claim 1 including:

a display produced by said processor illustrating pump discharge pressure and pump suction pressure as a function of piston position.

5. The analysis system set forth in claim 1 including:

a display produced by said processor illustrating pump discharge pressure as a function of piston position and discharge pressure variation as a function of pressure pulsation frequency.

6. The analysis system set forth in claim 1 including:

a display produced by said processor illustrating at least one of pump fluid suction pressure as a function of piston position and fluid pressure variation as a function of pressure pulsation frequency.

7. The analysis system set forth in claim 1 wherein:

said position sensor comprises a beam generator and beam interrupter for generating a square wave pulse signal for transmission to said processor whereby the time from generation of a leading edge of said square wave pulse to the next square wave pulse generated by said position sensor determines the pump cycle in terms of rotation of a crankshaft operably connected to said piston.

8. The analysis system set forth in claim 1 wherein:

said pump system includes at least one pressure pulsation dampener connected to at least one of an inlet fluid flowline connected to said pump and a discharge fluid flowline connected to said pump, said analysis system including at least one pressure sensor operably connected to said flowline upstream or downstream of said pulsation dampener, said pressure sensor connected to said flowline being operably connected to said processor whereby said processor is operable to determine at least one of hydraulic resonance in said flowline and at least one performance characteristic of said pulsation dampener.

9. The analysis system set forth in claim 1 including:

means for measuring power input to said pump and operably connected to said processor, said processor being operable to determine pump mechanical efficiency based on power input signals received from said power input measuring means and calculated hydraulic power output of said pump.

10. A method for determining selected performance parameters of a reciprocating piston power pump, said pump including a housing providing at least one fluid chamber therein, a fluid inlet valve opening into said chamber, a fluid discharge valve for discharging fluid from said chamber, a reciprocating piston operable to displace fluid from said chamber, inlet and discharge fluid piping in fluid flow communication with said chamber, a power sensor for measuring power input to said pump, at least one pressure sensor in communication with said chamber for measuring pressure therein, at least one position sensor for sensing movement of said piston to determine a piston end of stroke position with respect to said chamber, and a signal processor operably connected to said sensors for receiving signals from said sensors, respectively, and for determining selected performance parameters, said method comprising the steps of:

sensing pressure variations in said chamber, determining selected positions of said piston with respect to said chamber, and determining at least one pump performance parameter based on sensed pressure and piston position and selected from a group consisting of valve sealing delay, piston seal leakage, maximum and minimum pressures in said chamber, volumetric efficiency, pump fluid flow rate, hydraulic power produced for a pump operating cycle, and a pump pulsation dampener volume factor of said pump; and

displaying said selected performance parameter.

11. The method set forth in claim 10 including the step of:

displaying at least one of operating pressure, peak-to-peak pressure and fluid flow induced peak-to-peak pressure in at least one of fluid discharge piping and fluid inlet piping connected to said pump.

12. The method set forth in claim 10 including the step of:

displaying the delay in sealing of at least one of said inlet valve and said discharge valve as a function of piston position.

13. The method set forth in claim 10 including the step of:

displaying one of pump volumetric efficiency and mechanical efficiency as a function of pump discharge pressure.

14. The method set forth in claim 10 including the step of:

displaying at least one of pump volumetric efficiency and mechanical efficiency as a function of pump speed.

15. The method set forth in claim 10 including the step of:

displaying chamber pressure variation as a function of pump speed during a discharge stroke of said piston.

16. The method set forth in claim 10 including the step of:

displaying at least one of pump discharge pressure as a function of piston position arid pressure variation at selected frequencies thereof.

17. A method for determining selected performance parameters of a reciprocating piston power pump, said pump including a housing providing at least one fluid chamber therein, a fluid inlet valve opening into said chamber, a fluid discharge valve for discharging fluid from said chamber, a reciprocating piston operable to displace fluid from said chamber, inlet and discharge fluid piping in fluid flow communication with said chamber, at least one pressure sensor in communication with said chamber for measuring pressure therein, at least one position sensor for sensing movement of said piston for determining the position of said piston with respect to a maximum and minimum displacement position with respect to said chamber and a signal processor operably connected to said sensors for receiving signals therefrom and for determining selected pump performance parameters, said method comprising the steps of:

sensing pressure variations in said chamber, determining a position of said piston with respect to said chamber, and determining at least one pump performance parameter selected from a group consisting of valve sealing delay, piston seal leakage, pump volumetric efficiency, pump fluid flow rate, a pump pulsation dampener delta volume factor and hydraulic power produced for each pump operating cycle; and

displaying said selected performance parameter.

18. The method set forth in claim 17 including the step of:

determining the delay in pump suction valve sealing by comparing the pressure increase measured in said chamber with the position of said piston in said chamber.

19. The method set forth in claim 17 including the step of:

measuring the position of said piston as a function of pressure increase in said chamber denoting inlet valve closure as compared with discharge valve opening to determine fluid compression.

20. The method set forth in claim 17 including the step of:

determining closure and sealing of said discharge valve based on the measured positions of said piston at the beginning of the fluid inlet stroke of said piston compared with the position of said piston at which pressure in said chamber has decreased to nominal fluid inlet pressure to said chamber.

21. The method set forth in claim 17 including the step of:

measuring fluid decompression based on the positions of said piston at which measured pressure indicates discharge valve sealing and measured pressure indicates inlet valve opening.

22. The method set forth in claim 17 including the step of:

determining chamber volumetric efficiency of said pump by comparing the volume displaced by said piston between the positions of said piston at which the inlet valve opens and the inlet valve seals closed compared with total chamber volume swept by said piston.

23. The method set forth in claim 17 including the step of:

determining leakage of a piston seal by measuring the deviation of fluid pressure rise during a fluid compression cycle of said piston as compared with normal fluid pressure rise during said compression cycle.

24. The method set forth in claim 17 including the step of:

measuring piston seal leak rate by measuring the difference between pump chamber volume displaced normally and actually by said piston to reach fluid discharge operating pressure.

25. The method set forth in claim 17 including the step of:

measuring inlet valve leakage rate by measuring the chamber volume displaced by said piston and required to reach fluid discharge operating pressure.

26. The method set forth in claim 17 including the step of:

measuring discharge valve leakage rate by measuring the chamber volume displaced by said piston required to reach fluid inlet operating pressure during a fluid inlet stroke of said piston.

27. The method set forth in claim 17 including the step of:

measuring inlet fluid acceleration head response by measuring the time between inlet valve opening and measured pressure peak pressure in one of said fluid inlet piping and said chamber after opening of said inlet valve.

28. The method set forth in claim 17 including the step of:

measuring fluid cavitation in said chamber during a fluid inlet stroke of said piston by measuring minimum and maximum pressures in said chamber during said fluid inlet stroke.

29. The method set forth in claim 17 including the step of:

measuring overshoot pressure in said chamber by determining the peak chamber pressure minus the average pump fluid discharge pressure.

30. The method set forth in claim 17 including the step of:

determining fluid flow induced pressure variations by determining the sum of peak to peak pressures at frequencies of one and two times the rotational speed of a crankshaft of said pump multiplied by the number of pumping chambers in said pump.

31. The method set forth in claim 17 including the step of:

determining fluid flow acceleration induced pressures by comparing total peak to peak pressure variation.

32. The method set forth in claim 17 including the step of:

determining fluid hydraulic resonance by comparing fluid pressure variation as a function of time or a pump crankshaft rotational position with a true sine wave.

33. The method set forth in claim 17 including the step of:

comparing fluid flow induced pressure variations with predetermined fluid pressure variations to detect a failure of pressure pulsation control.

34. A performance analysis system for analyzing selected performance parameters of a pump system including a reciprocating piston power pump having at least one reciprocating piston operable to displace fluid from a housing having a pumping chamber, said analysis system comprising:

a piston displacement position sensor operable to sense a predetermined position of said piston comprising a beam generator and beam interrupter for generating a square wave pulse signal for transmission to said processor whereby the time from generation of a leading edge of said square wave pulse to the next square wave pulse generated by said position sensor determines the pump cycle in terms of rotation of a crankshaft operably connected to said piston, said beam interruptor is mounted on a linkage between said piston and said crankshaft and is operable to interrupt a beam when said piston has reached a predetermined position;

a pressure sensor operable to sense pressure in said chamber;

a signal processor operably connected to said sensors for receiving signals therefrom and for generating information corresponding to at least one performance parameter selected from a group consisting of delay in opening or closing of one or more valves for admitting fluid to and discharging fluid from said chamber, pressure variation indicative of a leakage condition of a piston seal, maximum and minimum chamber pressure, pump volumetric efficiency and pump fluid flow rate, and said processor is operable to determine a fluid suction stroke of said piston represented by one half of a crankshaft rotation cycle between 0° and

180°

beginning with a computed beginning of stroke signal from said position sensor, and a piston fluid discharge stroke is represented by one half of said crankshaft rotation cycle between 180° and

360°

of said piston stroke; and

means for displaying said at least one performance parameter.

35. A performance analysis system for analyzing selected performance parameters of a pump system including a reciprocating piston power pump having at least one reciprocating piston operable to displace fluid from a housing having a pumping chamber, said analysis system comprising:

a piston displacement position sensor operable to sense a predetermined position of said piston;

a pressure sensor operable to sense pressure in said chamber;

a signal processor operably connected to said sensors for receiving signals therefrom and for generating information corresponding to at least one performance parameter selected from a group consisting of delay in opening or closing of one or more valves for admitting fluid to and discharging fluid from said chamber, pressure variation indicative of a leakage condition of a piston seal, maximum and minimum chamber pressure, pump volumetric efficiency and pump fluid flow rate;

said pressure sensor is operable to provide signals to said processor for determination by said processor of pump valve sealing delays, fluid compression delay, piston seal leakage and maximum and minimum chamber pressures, respectively; and

means for displaying said at least one performance parameter.

36. A method for determining selected performance parameters of a reciprocating piston power pump, said pump including a housing providing at least one fluid chamber therein, a fluid inlet valve opening into said chamber, a fluid discharge valve for discharging fluid from said chamber, a reciprocating piston operable to displace fluid from said chamber, inlet and discharge fluid piping in fluid flow communication with said chamber, a power sensor for measuring power input to said pump, at least one pressure sensor in communication with said chamber for measuring pressure therein, at least one position sensor for sensing piston end of stroke position with respect to said chamber, and a signal processor operably connected to said sensors for receiving signals from said sensors, respectively, and for determining selected performance parameters, said method comprising the steps of:

sensing pressure variations in said chamber, determining selected positions of said piston with respect to said chamber, and determining at least one pump performance parameter based on sensed pressure and piston position and selected from a group consisting of valve sealing delay, piston seal leakage, maximum and minimum pressures in said chamber, volumetric efficiency, pump fluid flow rate, hydraulic power produced for a pump operating cycle, and a pump pulsation dampener volume factor of said pump;

displaying said selected performance parameter; and

displaying piston seal leakage as a function of fluid discharge pressure variation during a discharge stroke of said piston.

37. A method for determining selected performance parameters of a reciprocating piston power pump, said pump including a housing providing at least one fluid chamber therein, a fluid inlet valve opening into said chamber, a fluid discharge valve for discharging fluid from said chamber, a reciprocating piston operable to displace fluid from said chamber, inlet and discharge fluid piping in fluid flow communication with said chamber, a power sensor for measuring power input to said pump, at least one pressure sensor in communication with said chamber for measuring pressure therein, at least one position sensor for sensing piston end of stroke position with respect to said chamber, and a signal processor operably connected to said sensors for receiving signals from said sensors, respectively, and for determining selected performance parameters, said method comprising the steps of:

sensing pressure variations in said chamber, determining selected positions of said piston with respect to said chamber, and determining at least one pump performance parameter based on sensed pressure and piston position and selected from a group consisting of valve sealing delay, piston seal leakage, maximum and minimum pressures in said chamber, volumetric efficiency, pump fluid flow rate, hydraulic power produced for a pump operating cycle, and a pump pulsation dampener volume factor of said pump;

displaying said selected performance parameter; and

displaying pump chamber pressure as a function piston position with respect to said chamber to determine pressure variation during displacement of fluid from said chamber, delay in chamber pressure increase during a piston fluid discharge stroke and delay in chamber pressure decrease during a piston fluid inlet stroke.

38. A method for determining selected performance parameters of a reciprocating piston power pump, said pump including a housing providing at least one fluid chamber therein, a fluid inlet valve opening into said chamber, a fluid discharge valve for discharging fluid from said chamber, a reciprocating piston operable to displace fluid from said chamber, inlet and discharge fluid piping in fluid flow communication with said chamber, a power sensor for measuring power input to said pump, at least one pressure sensor in communication with said chamber for measuring pressure therein, at least one position sensor for sensing piston end of stroke position with respect to said chamber, and a signal processor operably connected to said sensors for receiving signals from said sensors, respectively, and for determining selected performance parameters, said method comprising the steps of:

sensing pressure variations in said chamber, determining selected positions of said piston with respect to said chamber, and determining at least one pump performance parameter based on sensed pressure and piston position and selected from a group consisting of valve sealing delay, piston seal leakage, maximum and minimum pressures in said chamber, volumetric efficiency, pump fluid flow rate, hydraulic power produced for a pump operating cycle, and a pump pulsation dampener volume factor of said pump;

displaying said selected performance parameter; and

displaying delay in fluid inlet and discharge valve closure with respect to piston position at selected pump speeds.

39. A method for determining selected performance parameters of a reciprocating piston power pump, said pump including a housing providing at least one fluid chamber therein, a fluid inlet valve opening into said chamber, a fluid discharge valve for discharging fluid from said chamber, a reciprocating piston operable to displace fluid from said chamber, inlet and discharge fluid piping in fluid flow communication with said chamber, a power sensor for measuring power input to said pump, at least one pressure sensor in communication with said chamber for measuring pressure therein, at least one position sensor for sensing piston end of stroke position with respect to said chamber, and a signal processor operably connected to said sensors for receiving signals from said sensors, respectively, and for determining selected performance parameters, said method comprising the steps of:

sensing pressure variations in said chamber, determining selected positions of said piston with respect to said chamber, and determining at least one pump performance parameter based on sensed pressure and piston position and selected from a group consisting of valve sealing delay, piston seal leakage, maximum and minimum pressures in said chamber, volumetric efficiency, pump fluid flow rate, hydraulic power produced for a pump operating cycle, and a pump pulsation dampener volume factor of said pump;

displaying said selected performance parameter; and

displaying peak pressures as a function of frequency of said peak pressures for selected speed of movement of said piston in strokes per minute.