SYSTEMS AND METHODS TO MONITOR PUMP CAVITATION

• US 20140039805A1
• Filed: 07/31/2012
• Published: 02/06/2014
• Est. Priority Date: 07/31/2012
• Status: Active Grant

• Current Assignee: Fisher-Rosemount Systems Incorporated (Emerson Electric Company)
• Original Assignee: Joseph H. Sharpe Jr
• Inventors: Skeirik, Robert, Sharpe, Joseph H. Jr., Hawkins, Gary
• Granted Patent: US 9,255,578 B2
• Time in Patent Office: Days
• US Class Current: 702/24
• CPC Class Codes: F04B 11/00 Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
• CPC Class Codes: F04B 49/065 and making use of computers
• CPC Class Codes: F04D 15/0088 Testing machines
• CPC Class Codes: F04D 15/0245 responsive to a condition of the pump
• CPC Class Codes: F04D 29/669 especially adapted for liquid pumps F04D29/18 takes precedence
• CPC Class Codes: G01N 29/14 using acoustic emission techniques echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00

Abstract

Systems and methods to monitor pump cavitation are disclosed. An example method includes monitoring a pressure parameter and a vibration parameter associated with an asset in an operating process unit. The example method includes calculating a manipulated pressure value based on the pressure parameter. The example method includes calculating a manipulated vibration value based on the vibration parameter. The example method includes determining a state of cavitation associated with the asset based on at least one of the manipulated pressure value or the manipulated vibration value.

Claims

1. A method comprising:

monitoring a pressure parameter and a vibration parameter associated with an asset in an operating process unit;

calculating a manipulated pressure value based on the pressure parameter;

calculating a manipulated vibration value based on the vibration parameter; and

determining a state of cavitation associated with the asset based on at least one of the manipulated pressure value or the manipulated vibration value.

2. The method of claim 1, wherein the state of cavitation associated with the asset is at least one of a pre-cavitation state or a cavitation state.

3. The method of claim 1, further comprising creating an alarm associated with the state of cavitation, wherein the alarm is to be presented.

4. The method of claim 1, wherein calculating the manipulated pressure value based on the pressure parameter includes:

calculating a standard deviation value for a first number of pressure values; and

calculating an average standard deviation value for a second number of standard deviation values.

5. The method of claim 1, wherein determining the state of cavitation associated with the asset includes:

comparing the manipulated pressure value to a pressure baseline; and

determining the asset is in a pre-cavitation state if the manipulated pressure value exceeds the pressure baseline.

6. The method of claim 5, wherein the pressure baseline corresponds to at least one of values of the pressure parameter measured when the asset is operating in a normal operating condition or a signature of values of the pressure parameter measured across an operating range of one or more corresponding variable state parameters.

7. The method of claim 5, further comprising:

comparing the manipulated vibration value to a vibration baseline; and

determining the asset is in a cavitation state if the manipulated vibration value exceeds the vibration baseline.

8. A system comprising:

a monitoring application to monitor a pressure parameter and a vibration parameter associated with an asset in an operating process unit;

a pressure analyzer to calculate a manipulated pressure value based on the pressure parameter;

a vibration analyzer to calculate a manipulated vibration value based on the vibration parameter; and

a cavitation analyzer to determine a state of cavitation associated with the asset based on at least one of the manipulated pressure value or the manipulated vibration value.

9. The system of claim 8, wherein the state of cavitation associated with the asset is at least one of a pre-cavitation state or a cavitation state.

10. The system of claim 8, wherein the cavitation analyzer is to create an alarm associated with the state of cavitation, wherein the alarm is to be presented to an operator.

11. The system of claim 8, wherein, to calculate the manipulated pressure value based on the pressure parameter, the pressure analyzer is to:

calculate a standard deviation value for a first number of pressure values; and

calculate an average standard deviation value for a second number of standard deviation values.

12. The system of claim 8, wherein, to determine the state of cavitation associated with the asset, the cavitation analyzer is to:

compare the manipulated pressure value to a pressure baseline; and

determine the asset is in a pre-cavitation state if the manipulated pressure value exceeds the pressure baseline.

13. The system of claim 12, wherein the pressure baseline corresponds to at least one of values of the pressure parameter measured when the asset is operating in a normal operating condition or a signature of values of the pressure parameter measured across an operating range of one or more corresponding variable state parameters.

14. The system of claim 12, wherein the cavitation analyzer is to:

compare the manipulated vibration value to a vibration baseline; and

determine the asset is in a cavitation state if the manipulated vibration value exceeds the vibration baseline.

15. A tangible computer-readable storage medium comprising instructions that, when executed, cause a computing device to at least:

monitor a pressure parameter and a vibration parameter associated with an asset in an operating process unit;

calculate a manipulated pressure value based on the pressure parameter;

calculate a manipulated vibration value based on the vibration parameter; and

determine a state of cavitation associated with the asset based on at least one of the manipulated pressure value or the vibration parameter.

16. The computer-readable medium of claim 15, wherein the state of cavitation associated with the asset is at least one of a pre-cavitation state or a cavitation state.

17. The computer-readable medium of claim 15, further comprising instructions that cause the computing device to create an alarm associated with the state of cavitation, wherein the alarm is to be presented to an operator.

18. The computer-readable medium of claim 15, wherein calculating the manipulated pressure value based on the pressure parameter includes:

calculating a standard deviation value for a first number of pressure values; and

calculating an average standard deviation value for a second number of standard deviation values.

19. The computer-readable medium of claim 15, wherein determining the state of cavitation associated with the asset includes:

comparing the manipulated pressure value to a pressure baseline; and

determining the asset is in a pre-cavitation state if the manipulated pressure value exceeds the pressure baseline.

20. The computer-readable medium of claim 19, wherein the pressure baseline corresponds to at least one of the values of the pressure parameter measured when the asset is operating in a normal operating condition or a signature of values of the pressure parameter measured across an operating range of one or more corresponding variable state parameters.

21. The computer-readable medium of claim 19, further comprising instructions that cause the computing device to:

compare the manipulated vibration value to a vibration baseline; and

determine the asset is in a cavitation state if the manipulated vibration value exceeds the vibration baseline.