US4934399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipeline pressure control system
Assignee: Fisher Rosemount Systems Inc
•
Filing: 1989-04-25
•
Granted: 1990-06-19
•
Expires: 2009-04-25
Abstract
Abstract A pipeline pressure control system for minimizing pressure surges within a pipeline includes a suction pressure controller connected to a suction pressure transmitter for sensing the pipeline pressure upstream of a valve and a discharge pressure controller connected to a discharge pressure transmitter for sensing the pipeline pressure downstream of the valve. If either the suction pressure controller or the discharge pressure controller senses a pressure that varies more than a predetermined amount from a predetermined target pressure, the valve will automatically be moved to a predetermined position in order to counteract pressure surges.
Inventors
- 👤 Chun H. Cho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:28
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2013; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0396; Y10T137/7722; Y10T137/7758; Y10T137/7761
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
254 words
A pressure control system that responds to pressure surges in a pipeline by changing the pipeline pressure in the direction opposite the pressure surge, said pressure control system comprising: a pipeline; a valve coupled to said pipeline for varying the flow of fluid through said pipeline; a suction pressure sensor coupled to said pipeline upstream of said valve for sensing the suction pressure of the fluid within said pipeline; a discharge pressure sensor coupled to said pipeline downstream of said valve for sensing the discharge pressure of the fluid within said pipeline; a suction controller coupled to said suction pressure sensor, said suction controller comparing the suction pressure sensed by said suction pressure sensor with a first predetermined pressure setpoint to determine when the suction pressure is lower than said first pressure setpoint by more than a first predetermined amount of at least approximately five psi; and a discharge controller coupled to said discharge pressure sensor, said discharge controller comparing the discharge pressure sensed by said discharge pressure sensor with a second predetermined pressure setpoint to determine when the discharge pressure exceeds said second pressure setpoint by more than a second predetermined amount of at least approximately five psi, said valve being moved to a predetermined position in response to either said suction controller determining that the suction pressure is lower than said first pressure setpoint by more than said first predetermined amount or said discharge controller determining that the discharge pressure exceeds said second pressure setpoint by more than said second predetermined amount.
Claim 2
Dependent Claim
254 words
A pressure control system that responds to pressure surges in a pipeline by changing the pipeline pressure in the direction opposite the pressure surge, said pressure control system comprising: a pipeline; a valve coupled to said pipeline for varying the flow of fluid through said pipeline; a suction pressure sensor coupled to said pipeline upstream of said valve for sensing the suction pressure of the fluid within said pipeline; a discharge pressure sensor coupled to said pipeline downstream of said valve for sensing the discharge pressure of the fluid within said pipeline; a suction controller coupled to said suction pressure sensor, said suction controller comparing the suction pressure sensed by said suction pressure sensor with a first predetermined pressure setpoint to determine when the suction pressure is lower than said first pressure setpoint by more than a first predetermined amount of at least approximately five psi; and a discharge controller coupled to said discharge pressure sensor, said discharge controller comparing the discharge pressure sensed by said discharge pressure sensor with a second predetermined pressure setpoint to determine when the discharge pressure exceeds said second pressure setpoint by more than a second predetermined amount of at least approximately five psi, said valve being moved to a predetermined position in response to either said suction controller determining that the suction pressure is lower than said first pressure setpoint by more than said first predetermined amount or said discharge controller determining that the discharge pressure exceeds said second pressure setpoint by more than said second predetermined amount.
Claim 3
Dependent Claim
23 words
A pressure control system as defined in claim 1 wherein said discharge controller causes said valve to be moved to said predetermined position.
Claim 4
Dependent Claim
37 words
A pressure control system as defined in claim 1 wherein said first predetermined pressure setpoint is in the approximate range of 20-100 psi and said second predetermined pressure setpoint is in the approximate range of 500-2,000 psi.
Claim 5
Dependent Claim
22 words
A pressure control system as defined in claim 3 wherein said first predetermined amount is approximately equal to said second predetermined amount.
Claim 6
Dependent Claim
21 words
A pressure control system as defined in claim 4 wherein said first and said second predetermined amounts are approximately five psi.
Claim 7
Dependent Claim
131 words
A pipeline pressure control system that responds to a pressure surge in a pipeline by changing the pipeline pressure in the direction opposite the pressure surge, said pressure control system comprising: a pipeline; a valve coupled to said pipeline for varying the flow of fluid through said pipeline; a pressure sensor coupled to said pipeline for sensing the pressure of the fluid within said pipeline; and a controller coupled to said pressure sensor and said valve for controlling said valve, said controller causing said valve to be moved from an initial position to a predetermined position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure setpoint by at least a predetermined amount, whereby the pipeline pressure is changed in the direction opposite the pressure surge.
Claim 8
Dependent Claim
131 words
A pipeline pressure control system that responds to a pressure surge in a pipeline by changing the pipeline pressure in the direction opposite the pressure surge, said pressure control system comprising: a pipeline; a valve coupled to said pipeline for varying the flow of fluid through said pipeline; a pressure sensor coupled to said pipeline for sensing the pressure of the fluid within said pipeline; and a controller coupled to said pressure sensor and said valve for controlling said valve, said controller causing said valve to be moved from an initial position to a predetermined position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure setpoint by at least a predetermined amount, whereby the pipeline pressure is changed in the direction opposite the pressure surge.
Claim 9
Dependent Claim
44 words
A pipeline pressure control system as defined in claim 6 wherein said controller causes said valve to be moved to said predetermined position in response to said pressure sensor sensing a pressure that is greater than said predetermined amount above said predetermined pressure setpoint.
Claim 10
Dependent Claim
23 words
A pipeline pressure control system as defined in claim 6 wherein said initial value position is more open than said predetermined valve position.
Claim 11
Dependent Claim
17 words
A pressure control system as defined in claim 6 wherein said predetermined amount is approximately five psi.
Claim 12
Dependent Claim
125 words
A pressure control system that responds to a pressure surge in a conduit by changing the conduit pressure in the direction opposite the pressure surge, said pressure control system comprising: a conduit; a valve coupled to said conduit for varying the flow of fluid through said conduit; a pressure sensor coupled to said conduit for sensing the pressure of the fluid within said conduit; and a controller coupled to said pressure sensor and said valve for controlling said valve, said controller causing said valve to be moved to a predetermined position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure by at least a predetermined amount, whereby the conduit pressure is changed in the direction opposite the pressure surge.
Claim 13
Dependent Claim
125 words
A pressure control system that responds to a pressure surge in a conduit by changing the conduit pressure in the direction opposite the pressure surge, said pressure control system comprising: a conduit; a valve coupled to said conduit for varying the flow of fluid through said conduit; a pressure sensor coupled to said conduit for sensing the pressure of the fluid within said conduit; and a controller coupled to said pressure sensor and said valve for controlling said valve, said controller causing said valve to be moved to a predetermined position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure by at least a predetermined amount, whereby the conduit pressure is changed in the direction opposite the pressure surge.
Claim 14
Dependent Claim
17 words
A pressure control system as defined in claim 10 wherein said predetermined amount is approximately five psi.
Claim 15
Dependent Claim
129 words
A pressure control system that responds to a pressure surge in a conduit by changing the conduit pressure in the direction opposite the pressure surge, said pressure control system comprising: a conduit; a valve coupled to said conduit for varying the flow of fluid through said conduit; a pressure sensor coupled to said conduit for sensing the pressure of the fluid within said conduit; and control means coupled to said valve and said pressure sensor for controlling the position of said valve, said control means causing said valve to be moved to a predetermined position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure by at least a predetermined amount, whereby the conduit pressure is changed in the direction opposite the pressure surge.
Claim 16
Dependent Claim
129 words
A pressure control system that responds to a pressure surge in a conduit by changing the conduit pressure in the direction opposite the pressure surge, said pressure control system comprising: a conduit; a valve coupled to said conduit for varying the flow of fluid through said conduit; a pressure sensor coupled to said conduit for sensing the pressure of the fluid within said conduit; and control means coupled to said valve and said pressure sensor for controlling the position of said valve, said control means causing said valve to be moved to a predetermined position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure by at least a predetermined amount, whereby the conduit pressure is changed in the direction opposite the pressure surge.
Claim 17
Independent Claim
174 words
A method of controlling a valve in which a pressure surge in a conduit is counteracted by changing the conduit pressure in the direction opposite the pressure surge, said method comprising the steps of: (a) sensing the pressure upstream of a valve within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a first predetermined pressure; (c) comparing the pressure difference determined in said step (b) with a first predetermined pressure difference; (d) moving the valve to a first predetermined position if the pressure difference determined in said step (b) is greater than said first predetermined pressure difference; (e) sensing the internal conduit pressure downstream of the valve; (f) determining the difference between the pressure sensed in said step (e) and a second predetermined pressure; (g) comparing the pressure difference determined in said step (f) with a second predetermined pressure difference; and (h) moving the valve to a second predetermined position if the pressure difference determined in said step (f) is greater than said second predetermined pressure difference.
Claim 18
Independent Claim
174 words
A method of controlling a valve in which a pressure surge in a conduit is counteracted by changing the conduit pressure in the direction opposite the pressure surge, said method comprising the steps of: (a) sensing the pressure upstream of a valve within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a first predetermined pressure; (c) comparing the pressure difference determined in said step (b) with a first predetermined pressure difference; (d) moving the valve to a first predetermined position if the pressure difference determined in said step (b) is greater than said first predetermined pressure difference; (e) sensing the internal conduit pressure downstream of the valve; (f) determining the difference between the pressure sensed in said step (e) and a second predetermined pressure; (g) comparing the pressure difference determined in said step (f) with a second predetermined pressure difference; and (h) moving the valve to a second predetermined position if the pressure difference determined in said step (f) is greater than said second predetermined pressure difference.
Claim 19
Dependent Claim
22 words
A method as defined in claim 13 wherein said steps (a)-(c) are performed substantially simultaneously with and independently of said steps (e)-(g).
Claim 20
Dependent Claim
17 words
A method as defined in claim 13 wherein said first predetermined pressure difference is approximately five psi.
Claim 21
Independent Claim
110 words
A method of controlling a valve in which a pressure surge in a conduit is counteracted by changing the conduit pressure in the direction opposite the pressure surge, said method comprising the steps of: (a) sensing the pressure within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a predetermined pressure; (c) comparing the pressure difference determined in said step (b) with a predetermined pressure difference; and (d) moving a valve to a predetermined position if the pressure difference determined in said step (b) is greater than said predetermined pressure difference, whereby the conduit pressure is changed in the direction opposite the pressure surge.
Claim 22
Independent Claim
110 words
A method of controlling a valve in which a pressure surge in a conduit is counteracted by changing the conduit pressure in the direction opposite the pressure surge, said method comprising the steps of: (a) sensing the pressure within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a predetermined pressure; (c) comparing the pressure difference determined in said step (b) with a predetermined pressure difference; and (d) moving a valve to a predetermined position if the pressure difference determined in said step (b) is greater than said predetermined pressure difference, whereby the conduit pressure is changed in the direction opposite the pressure surge.
Claim 23
Dependent Claim
16 words
A method as defined in claim 16 wherein said predetermined pressure difference is approximately five psi.
Claim 24
Independent Claim
170 words
A method of controlling a valve in which a pressure surge in a conduit is counteracted by changing the conduit pressure in the direction opposite the pressure surge, said method comprising the steps of: (a) sensing the pressure within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a predetermined pressure; (c) comparing the pressure difference determined in said step (b) with a predetermined pressure difference; and (d) if the pressure difference determined in said step (b) is greater than said predetermined pressure difference, moving a valve coupled to the conduit from an initial position to a predetermined position, whereby the conduit pressure is changed in the direction opposite the pressure surge; or (e) if the pressure difference determined in said step (b) is less than said predetermined pressure difference and the pressure sensed in said step (a) is beyond said predetermined pressure, moving the valve from an initial position to a new position based upon the pressure difference determined in said step (b).
Claim 25
Independent Claim
170 words
A method of controlling a valve in which a pressure surge in a conduit is counteracted by changing the conduit pressure in the direction opposite the pressure surge, said method comprising the steps of: (a) sensing the pressure within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a predetermined pressure; (c) comparing the pressure difference determined in said step (b) with a predetermined pressure difference; and (d) if the pressure difference determined in said step (b) is greater than said predetermined pressure difference, moving a valve coupled to the conduit from an initial position to a predetermined position, whereby the conduit pressure is changed in the direction opposite the pressure surge; or (e) if the pressure difference determined in said step (b) is less than said predetermined pressure difference and the pressure sensed in said step (a) is beyond said predetermined pressure, moving the valve from an initial position to a new position based upon the pressure difference determined in said step (b).
Claim 26
Dependent Claim
16 words
A method as defined in claim 18 wherein said predetermined pressure difference is approximately five psi.
Claim 27
Independent Claim
327 words
A method of controlling a valve in which a pressure surge in a conduit is counteracted by changing the conduit pressure in the direction opposite the pressure surge, said method comprising the steps of: (a) sensing the pressure upstream of a valve within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a first predetermined pressure; (c) comparing the pressure difference determined in said step (b) with a first predetermined pressure difference; (d) if the pressure difference determined in said step (b) is greater than said first predetermined pressure difference, determining a new valve position based upon a first predetermined valve position; or (e) if the pressure difference determined in said step (b) is less than said first predetermined pressure difference and the pressure sensed in said step (a) is less than said first predetermined pressure, determining a new valve position based upon the difference determined in said step (b); (f) sensing the pressure downstream of the valve within the conduit; (g) determining the difference between the pressure sensed in said step (f) and a second predetermined pressure; (h) comparing the pressure difference determined in said step (g) with a second predetermined pressure difference; and (i) if the pressure difference determined in said step (g) is greater than said second predetermined pressure difference, determining a new valve position based upon a second predetermined valve position; or (j) if the pressure difference determined in said step (g) is less than said second predetermined pressure difference and the pressure sensed in said step (f) is greater than said second predetermined pressure, determining a new valve position based upon the difference determined in said step (g); (k) comparing the new valve position determined in said step (d) or (e) with the new valve position determined in said step (i) or (j) to determine the most closed valve position; and (l) moving the valve to the most closed valve position determined in said step (k).
Claim 28
Independent Claim
327 words
A method of controlling a valve in which a pressure surge in a conduit is counteracted by changing the conduit pressure in the direction opposite the pressure surge, said method comprising the steps of: (a) sensing the pressure upstream of a valve within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a first predetermined pressure; (c) comparing the pressure difference determined in said step (b) with a first predetermined pressure difference; (d) if the pressure difference determined in said step (b) is greater than said first predetermined pressure difference, determining a new valve position based upon a first predetermined valve position; or (e) if the pressure difference determined in said step (b) is less than said first predetermined pressure difference and the pressure sensed in said step (a) is less than said first predetermined pressure, determining a new valve position based upon the difference determined in said step (b); (f) sensing the pressure downstream of the valve within the conduit; (g) determining the difference between the pressure sensed in said step (f) and a second predetermined pressure; (h) comparing the pressure difference determined in said step (g) with a second predetermined pressure difference; and (i) if the pressure difference determined in said step (g) is greater than said second predetermined pressure difference, determining a new valve position based upon a second predetermined valve position; or (j) if the pressure difference determined in said step (g) is less than said second predetermined pressure difference and the pressure sensed in said step (f) is greater than said second predetermined pressure, determining a new valve position based upon the difference determined in said step (g); (k) comparing the new valve position determined in said step (d) or (e) with the new valve position determined in said step (i) or (j) to determine the most closed valve position; and (l) moving the valve to the most closed valve position determined in said step (k).
Claim 29
Dependent Claim
21 words
A method as defined in claim 20 wherein said first predetermined valve position is different from said second predetermined valve position.
Claim 30
Dependent Claim
22 words
A method as defined in claim 20 wherein said first predetermined pressure difference is the same as said second predetermined pressure difference.
Claim 31
Dependent Claim
17 words
A method as defined in claim 22 wherein said second predetermined pressure difference is approximately five psi.
Claim 32
Independent Claim
139 words
A method of controlling a valve comprising the steps of: (a) sensing the pressure within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a predetermined pressure; (c) comparing the pressure difference determined in said step (b) with a predetermined pressure difference of approximately five psi; and (d) if the pressure difference determined in said step (b) is greater than said five psi pressure difference, moving a valve coupled to the conduit from an initial position to a predetermined position; or (e) if the pressure difference computed in said step (b) is less than said five psi pressure difference and the pressure sensed in said step (a) is beyond said predetermined pressure, moving the valve from an initial position to a new position based upon the pressure difference determined in said step (b).
Claim 33
Independent Claim
139 words
A method of controlling a valve comprising the steps of: (a) sensing the pressure within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a predetermined pressure; (c) comparing the pressure difference determined in said step (b) with a predetermined pressure difference of approximately five psi; and (d) if the pressure difference determined in said step (b) is greater than said five psi pressure difference, moving a valve coupled to the conduit from an initial position to a predetermined position; or (e) if the pressure difference computed in said step (b) is less than said five psi pressure difference and the pressure sensed in said step (a) is beyond said predetermined pressure, moving the valve from an initial position to a new position based upon the pressure difference determined in said step (b).
Claim 34
Dependent Claim
159 words
A pipeline pressure control system that responds to a pressure surge in a pipeline by changing the pipeline pressure in the direction opposite the pressure surge, said pressure control system having a predetermined shutdown pressure, said pressure control system comprising: a pipeline; a valve coupled to said pipeline for varying the flow of fluid through said pipeline; a pressure sensor coupled to said pipeline for sensing the pressure of the fluid within said pipeline; and a controller coupled to said pressure sensor and said valve for controlling said valve, said controller causing said valve to be moved from an initial position to a predetermined position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure setpoint by at least a predetermined amount, whereby the pipeline pressure is changed in the direction opposite the pressure surge, said predetermined amount being substantially less than the difference between said predetermined pressure setpoint an said predetermined shutdown pressure.
Claim 35
Dependent Claim
159 words
A pipeline pressure control system that responds to a pressure surge in a pipeline by changing the pipeline pressure in the direction opposite the pressure surge, said pressure control system having a predetermined shutdown pressure, said pressure control system comprising: a pipeline; a valve coupled to said pipeline for varying the flow of fluid through said pipeline; a pressure sensor coupled to said pipeline for sensing the pressure of the fluid within said pipeline; and a controller coupled to said pressure sensor and said valve for controlling said valve, said controller causing said valve to be moved from an initial position to a predetermined position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure setpoint by at least a predetermined amount, whereby the pipeline pressure is changed in the direction opposite the pressure surge, said predetermined amount being substantially less than the difference between said predetermined pressure setpoint an said predetermined shutdown pressure.
Claim 36
Dependent Claim
137 words
A pressure control system having a predetermined shutdown pressure, comprising: a conduit; a valve coupled to said conduit that varies the flow of fluid through said conduit, said valve having a first position corresponding to a predetermined pressure setpoint and a second position corresponding to a predetermined position different than said first position; a pressure sensor coupled to said conduit that senses the pressure of the fluid within said conduit; and a controller coupled to said pressure sensor and said valve that controls said valve, said controller causing said valve to be moved in said second position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure by at least a predetermined amount, said predetermined amount being substantially less than the difference between said predetermined pressure setpoint and said predetermined shutdown pressure.
Claim 37
Dependent Claim
137 words
A pressure control system having a predetermined shutdown pressure, comprising: a conduit; a valve coupled to said conduit that varies the flow of fluid through said conduit, said valve having a first position corresponding to a predetermined pressure setpoint and a second position corresponding to a predetermined position different than said first position; a pressure sensor coupled to said conduit that senses the pressure of the fluid within said conduit; and a controller coupled to said pressure sensor and said valve that controls said valve, said controller causing said valve to be moved in said second position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure by at least a predetermined amount, said predetermined amount being substantially less than the difference between said predetermined pressure setpoint and said predetermined shutdown pressure.
Claim 38
Dependent Claim
113 words
A pressure control system comprising: a conduit; a valve coupled to said conduit that varies the flow of fluid through said conduit, said valve having a first position corresponding to a predetermined pressure setpoint and a second position corresponding to a predetermined position different than said first position; a pressure sensor coupled to said conduit that senses the pressure of the fluid within said conduit; and a controller coupled to said pressure sensor and said valve that controls said valve, said controller causing said valve to be moved to said second position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure by at least a predetermined amount.
Claim 39
Dependent Claim
113 words
A pressure control system comprising: a conduit; a valve coupled to said conduit that varies the flow of fluid through said conduit, said valve having a first position corresponding to a predetermined pressure setpoint and a second position corresponding to a predetermined position different than said first position; a pressure sensor coupled to said conduit that senses the pressure of the fluid within said conduit; and a controller coupled to said pressure sensor and said valve that controls said valve, said controller causing said valve to be moved to said second position in response to said pressure sensor sensing a pressure that varies from a predetermined pressure by at least a predetermined amount.
Claim 40
Independent Claim
93 words
A method of controlling a valve comprising the steps of: (a) sensing the pressure within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a predetermined target pressure; (c) comparing the pressure difference determined in said step (b) with a predetermined pressure difference; and (d) moving a valve to a predetermined position if the pressure difference determined in said step (b) is greater than said predetermined pressure difference, said predetermined position being a position different than the position of the valve corresponding to said predetermined target pressure.
Claim 41
Independent Claim
93 words
A method of controlling a valve comprising the steps of: (a) sensing the pressure within a conduit; (b) determining the difference between the pressure sensed in said step (a) and a predetermined target pressure; (c) comparing the pressure difference determined in said step (b) with a predetermined pressure difference; and (d) moving a valve to a predetermined position if the pressure difference determined in said step (b) is greater than said predetermined pressure difference, said predetermined position being a position different than the position of the valve corresponding to said predetermined target pressure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |