Condition assessment system and method

• US 20060071800A1
• Filed: 09/30/2004
• Published: 04/06/2006
• Est. Priority Date: 09/30/2004
• Status: Active Grant

• Current Assignee: Florida Power & Light Company (NextEra Energy, Inc.)
• Original Assignee: Florida Power & Light Company (NextEra Energy, Inc.)
• Inventors: Schultz, Paul C.
• Granted Patent: US 7,173,539 B2
• Time in Patent Office: Days
• US Class Current: 340/603
• CPC Class Codes: F16K 37/0083 by measuring valve parameters
• CPC Class Codes: G08B 25/045 with sensing devices and central station in a closed loop, e.g. McCullough loop
• CPC Class Codes: G08B 31/00 Predictive alarm systems characterised by extrapolation or other computation using updated historic data

Abstract

System and method for monitoring and controlling one or more valves. The method can include sensing a condition of a valve, transmitting the condition to a sensor server, and transmitting a data stream including the condition to an assessment application. The method can also include generating a predictive model and comparing the condition to the predictive model. The method can further include transmitting a control instruction to at least one of a valve positioner and the sensor server and varying the position of the valve based on the control instruction.

Claims

1. A system for monitoring a condition of a valve, the system comprising:

a valve having a variable position;

a valve positioner that receives a control instruction, that varies the position of the valve, that determines a condition of the valve, and that transmits the condition;

a sensor server that receives the condition, that transmits a data stream including the condition, that receives a control instruction from a control system, and that transmits the control instruction to the valve positioner; and

an assessment application that receives the data stream and that assesses the condition of the valve by comparing the data stream to a predictive model.

2. A system as claimed in claim 1, wherein the data stream transmitted by the sensor server to the assessment application is substantially continuous.

3. A system as claimed in claim 1, wherein the control instruction and the condition are transmitted between the sensor server and the valve positioner on a single transmission line.

4. A system as claimed in claim 1, wherein the condition transmitted by the valve positioner is a Highway Addressable Remote Transducer protocol signal.

5. A system as claimed in claim 1, wherein the sensor server is connected to the assessment application by an Object Linking and Embedding for Process Control link.

6. A system as claimed in claim 1, wherein the valve includes a steam valve.

7. A system as claimed in claim 1, wherein the valve includes a liquid valve.

8. A system as claimed in claim 1, wherein the sensor server includes a multiplexer.

9. A system as claimed in claim 8, wherein the multiplexer establishes a plurality of data channels.

10. A system as claimed in claim 9, wherein the plurality of data channels includes up to sixty-four data channels.

11. A system as claimed in claim 1, wherein the control system generates an approximately 4 to 20 milliamp control instruction.

12. A system as claimed in claim 1, wherein the assessment application generates the predictive model.

13. A system as claimed in claim 12, wherein the assessment application generates the predictive model from historical data.

14. A system as claimed in claim 1, further comprising a modem connected between the sensor server and the assessment application.

15. A system as claimed in claim 14, wherein the modem includes a RS232 to RS422 modem.

16. A system as claimed in claim 1, wherein the assessment application generates a warning signal when the data stream indicates a failure.

17. A system as claimed in claim 1, wherein the valve positioner applies one of a pressure and a force to the valve.

18. A system as claimed in claim 17, wherein the valve positioner applies approximately 3 to 27 pounds per square inch of pressure to the valve.

19. A system as claimed in claim 17, wherein the valve positioner varies the position of a valve plug by changing one of a pressure and a force applied to the valve.

20. A system as claimed in claim 1, wherein the control instruction includes a position instruction.

21. A system as claimed in claim 1, wherein the condition includes at least one of a position condition, an applied pressure condition, a received pressure condition, a temperature condition, an emission condition, and a distance traveled condition.

22. A system as claimed in claim 1, wherein the valve positioner includes a digital positioner.

23. A system for monitoring a condition of each one of a plurality of valves, each one of the plurality of valves having a variable position, the system comprising:

a plurality of valve positioners, each one of the plurality valve positioners determining a condition for each one of the plurality of valves, transmitting the condition, receiving a control instruction, and changing the position of one of the plurality of valves;

a sensor server receiving the condition from each one of the plurality of valve positioners, transmitting a data stream including the condition, receiving the control instruction from a control system, and transmitting the control instruction to one of the plurality of valve positioners; and

an assessment application receiving the data stream and assessing the condition of one of the plurality of valves by comparing the data stream to a predictive model.

24. A system as claimed in claim 23, wherein the data stream transmitted by the sensor server is substantially continuous.

25. A system as claimed in claim 23, wherein the control instruction and the condition are transmitted between the sensor server and one of the plurality of valve positioners on a single transmission line.

26. A system as claimed in claim 23, wherein the condition transmitted by each one of the plurality of valve positioners is a Highway Addressable Remote Transducer protocol signal.

27. A system as claimed in claim 23, wherein the sensor server is connected to the assessment application by an Object Linking and Embedding for Process Control link.

28. A system as claimed in claim 23, wherein the system monitors and controls a steam valve.

29. A system as claimed in claim 23, wherein the system monitors and controls a liquid valve.

30. A system as claimed in claim 23, wherein the sensor server includes a multiplexer.

31. A system as claimed in claim 30, wherein the multiplexer establishes a plurality of data channels.

32. A system as claimed in claim 31, wherein the plurality of data channels includes up to sixty-four data channels.

33. A system as claimed in claim 23, wherein the control system generates an approximately 4 to 20 milliamp control instruction.

34. A system as claimed in claim 23, wherein the assessment application generates the predictive model.

35. A system as claimed in claim 34, wherein the assessment application generates the predictive model from historical data.

36. A system as claimed in claim 23, further comprising a modem connected between the sensor server and the assessment application.

37. A system as claimed in claim 36, wherein the modem includes a RS232 to RS422 modem.

38. A system as claimed in claim 23, wherein the assessment application generates a warning signal when the data stream indicates a failure.

39. A system as claimed in claim 23, wherein each one of the plurality of valve positioners applies one of a pressure and a force to the valve.

40. A system as claimed in claim 39, wherein at least one of the plurality of valve positioners applies approximately 3 to 27 pounds per square inch of pressure to the valve.

41. A system as claimed in claim 40, wherein at least one of the plurality of valve positioners varies the position of a valve plug by changing one of a pressure and a force applied to the valve.

42. A system as claimed in claim 23, wherein the control instruction includes a position instruction.

43. A system as claimed in claim 23, wherein the condition includes at least one of a position condition, an applied pressure condition, a received pressure condition, a temperature condition, an emission condition, and a distance traveled condition.

44. A system as claimed in claim 23, wherein at least one of the plurality of valve positioners includes a digital positioner.

45. A method of monitoring and controlling a valve, the method comprising:

sensing a condition of the valve;

transmitting the condition to a sensor server;

transmitting a data stream including the condition to an assessment application;

generating a predictive model;

comparing the condition to the predictive model;

transmitting a control instruction to at least one of a valve positioner and the sensor server; and

varying the position of the valve based on the control instruction.

46. A method as claimed in claim 45, further comprising transmitting a continuous data stream.

47. A method as claimed in claim 45, further comprising transmitting the condition and the control instruction between the sensor server and the valve positioner over a single transmission line.

48. A method as claimed in claim 45, further comprising transmitting the condition including a Highway Addressable Remote Transducer protocol signal.

49. A method as claimed in claim 45, further comprising establishing an Object Linking and Embedding for Process Control link between the sensor server and the assessment application.

50. A method as claimed in claim 45, further comprising sensing a condition of a steam valve.

51. A method as claimed in claim 45, further comprising sensing a condition of a liquid valve.

52. A method as claimed in claim 45, further comprising transmitting the condition to a multiplexer included in the sensor server.

53. A method as claimed in claim 52, further comprising establishing a plurality of data channels.

54. A method as claimed in claim 53, further comprising assigning the condition to one of the plurality of data channels.

55. A method as claimed in claim 54, further comprising generating an approximately 4 to 20 milliamp control instruction.

56. A method as claimed in claim 45, further comprising generating the predictive model from historical data.

57. A method as claimed in claim 45, further comprising modulating the data stream.

58. A method as claimed in claim 57, further comprising converting the data stream from a RS232 protocol to a RS422 protocol.

59. A method as claimed in claim 45, further comprising generating a warning signal when the data stream indicates a failure.

60. A method as claimed in claim 45, further comprising applying one of a pressure and a force to the valve.

61. A method as claimed in claim 60, further comprising applying an approximately 3 to 27 pounds per square inch of pressure to the valve.

62. A method as claimed in claim 60, further comprising applying one of a pressure and a force to the valve based on the control instruction.

63. A method as claimed in claim 45, further comprising generating a control instruction including a position instruction.

64. A method as claimed in claim 45, further comprising sensing at least one of a position condition, an applied pressure condition, a received pressure condition, a temperature condition, an emission condition, and a distance traveled condition.

65. A method as claimed in claim 45, further comprising generating a digital condition.

66. A valve positioner for monitoring and controlling a valve, the valve positioner comprising:

an actuator that applies one of a pressure and a force to the valve;

a sensor that reads a condition of the valve; and

a processor that transmits the condition to a sensor server, that receives a control instruction from a control system, and that instructs the actuator to apply one of a pressure and a force to the valve.

67. A valve positioner as claimed in claim 66, wherein the processor transmits the condition in a data stream that is substantially continuous.

68. A valve positioner as claimed in claim 66, wherein the processor transmits the condition and receives the control instruction over a single transmission line.

69. A valve positioner as claimed in claim 66, wherein the condition is a Highway Addressable Remote Transducer protocol signal.

70. A valve positioner as claimed in claim 66, wherein the processor transmits the condition to the assessment application over an Object Linking and Embedding for Process Control link.

71. A valve positioner as claimed in claim 66, wherein the valve includes a steam valve.

72. A valve positioner as claimed in claim 66, wherein the valve includes a liquid valve.

73. A valve positioner as claimed in claim 66, wherein the actuator applies approximately 3 to 27 pounds per square inch of pressure to the valve.

74. A valve positioner as claimed in claim 66, wherein the control instruction includes a position instruction.

75. A valve positioner as claimed in claim 66, wherein the condition includes at least one of a position condition, an applied pressure condition, a received pressure condition, a temperature condition, an emission condition, and a distance traveled condition.

76. A valve positioner as claimed in claim 66, wherein the condition is digital.

77. A sensor server for use in a system for monitoring and controlling a plurality of valves, the sensor server comprising:

a plurality of valve channels receiving a condition from each one of a plurality of valve positioners and transmitting a control instruction to each one of the plurality of valve positioners;

a multiplexer combining the condition received from each one of the plurality of valve positioners into a data stream;

an assessment channel transmitting the data stream to an assessment application; and

a control system channel receiving a control instruction for each one of the plurality of valve positioners.

78. A sensor server as claimed in claim 77, wherein the data stream is substantially continuous.

79. A sensor server as claimed in claim 77, wherein the condition is received from and the control instruction is transmitted over a single transmission line.

80. A sensor server as claimed in claim 77, wherein the condition includes a Highway Addressable Remote Transducer protocol signal.

81. A sensor server as claimed in claim 77, wherein the assessment channel includes an Object Linking and Embedding for Process Control link.

82. A sensor server as claimed in claim 77, wherein at least one of the plurality of valves includes a steam valve.

83. A sensor server as claimed in claim 77, wherein at least one of the plurality of valves includes a liquid valve.

84. A sensor server as claimed in claim 77, wherein the data stream includes a plurality of data channels.

85. A sensor server as claimed in claim 84, wherein the multiplexer establishes the plurality of data channels.

86. A sensor server as claimed in claim 85, wherein the multiplexer assigns the condition from each one of the plurality of valve positioners to one of the plurality of data channels.

87. A sensor server as claimed in claim 77, wherein the control system generates an approximately 4 to 20 milliamp control instruction.

88. A sensor server as claimed in claim 77, further comprising a modem connected between the sensor server and the assessment application.

89. A sensor server as claimed in claim 88, wherein the modem includes a RS232 to RS422 modem.

90. A sensor server as claimed in claim 77, wherein the control instruction includes a position condition.

91. A sensor server as claimed in claim 77, wherein the condition includes at least one of a position condition, an applied pressure condition, a received pressure condition, a temperature condition, an emission condition, and a distanced traveled condition.

92. A sensor server as claimed in claim 77, wherein at least one of the plurality of valve positioners includes a digital positioner.

93. A system for monitoring a condition of a valve, the system comprising:

a valve having a variable position;

a valve positioner that receives a control instruction, that varies the position of the valve, that determines a condition of the valve, and that transmits the condition in a Highway Addressable Remote Transducer protocol signal;

a sensor server that receives the condition, that transmits a substantially continuous data stream including the condition, that receives a control instruction from a control system, and that transmits the control instruction to the valve positioner, the control instruction and the condition being transmitted between the sensor server and the valve positioner on a single transmission line; and

an assessment application that receives the substantially continuous data stream over an Object Linking and Embedding for Process Control link and that assesses the condition of the valve by comparing the data stream to a predictive model.

94. Computer readable medium containing instructions for monitoring and controlling a plurality of valves, the instructions comprising:

determining a condition for each one of the plurality of valves;

transmitting the condition to a sensor server;

generating a data stream including the condition for each one of the plurality of valves;

transmitting the data stream to an assessment application;

generating a predictive model;

comparing the data stream to the predictive model;

transmitting a control instruction from a control system to at least one of the sensor server and a valve positioner; and

varying the position of the valve based on the control instruction.

95. A computer readable medium as claimed in claim 94, further comprising transmitting a substantially continuous data stream.

96. A computer readable medium as claimed in claim 94, further comprising transmitting the condition and the control instruction between the sensor server and the valve positioner over a single transmission line.

97. A computer readable medium as claimed in claim 94, further comprising transmitting the condition including a Highway Addressable Remote Transducer protocol signal.

98. A computer readable medium as claimed in claim 94, further comprising transmitting the condition over an Object Linking and Embedding for Process Control link.

99. A computer readable medium as claimed in claim 94, further comprising sensing a condition of a steam valve.

100. A computer readable medium as claimed in claim 94, further comprising sensing a condition of a liquid valve.

102. A computer readable medium as claimed in claim 94, further comprising transmitting the condition to a multiplexer.

103. A computer readable medium as claimed in claim 94, further comprising establishing a plurality of data channels.

104. A computer readable medium as claimed in claim 103, further comprising assigning the condition to one of the plurality of data channels.

105. A computer readable medium as claimed in claim 94, further comprising generating an approximately 4 to 20 milliamp control instruction.

106. A computer readable medium as claimed in claim 94, further comprising generating the predictive model from historical data.

107. A computer readable medium as claimed in claim 94, further comprising modulating the data stream.

108. A computer readable medium as claimed in claim 107, further comprising converting the data stream from a RS232 protocol to a RS422 protocol.

109. A computer readable medium as claimed in claim 94, further comprising generating a warning signal when the data stream indicates a failure.

110. A computer readable medium as claimed in claim 94, further comprising applying one of a pressure and a force to the valve.

111. A computer readable medium as claimed in claim 110, further comprising applying approximately 3 to 27 pounds per square inch of pressure to the valve.

112. A computer readable medium as claimed in claim 110, further comprising applying one of a pressure and a force to the valve based on the control instruction.

113. A computer readable medium as claimed in claim 94, further comprising generating a position instruction.

114. A computer readable medium as claimed in claim 94, further comprising sensing at least one of a position condition, an applied pressure condition, a received pressure condition, a temperature condition, an emission condition, and a distance traveled condition.

115. A computer readable medium as claimed in claim 94, further comprising generating a digital condition.