Method, system and storage medium for performing online valve diagnostics
First Claim
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1. A method of performing online valve diagnostics for a valve operating in a plant process, the method comprising:
- obtaining valve information while said valve operates in response to a plurality of setpoints determined for controlling said plant process, said valve operating through a series of gradual movements;
said valve information including at least two of setpoint data, position data and pressure data;
deriving at least one of step response, friction and spring range for said valve based on said valve information.
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Abstract
Methods and systems for performing online valve diagnostics. Valve characteristics such as step response, friction and spring range are determined while the valve is operating in a process without intervention by a controller deriving the valve diagnostics. Valve information is obtained while the valve operates in response to a control signal controlling a process while the valve operates through a series of gradual movements. Valve characteristics are then determined from the valve information.
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Citations
13 Claims
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1. A method of performing online valve diagnostics for a valve operating in a plant process, the method comprising:
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obtaining valve information while said valve operates in response to a plurality of setpoints determined for controlling said plant process, said valve operating through a series of gradual movements; said valve information including at least two of setpoint data, position data and pressure data; deriving at least one of step response, friction and spring range for said valve based on said valve information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for deriving valve characteristics of a valve operating in a plant process, the system comprising:
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a process controller generating a plurality of setpoints determined for controlling said plant process, said plurality of setpoints operating said valve through a series of gradual movements; a positioner receiving said plurality of setpoints and generating a signal for positioning said valve; a controller receiving valve information from said positioner while it is operating based on the setpoints, said valve information including at least two of setpoint data, position data and pressure data; said controller deriving at least one of step response, friction and spring range for said valve based on said valve information.
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13. A storage medium encoded with machine-readable computer program code for deriving valve characteristics of a valve operating in a plant process, the storage medium including instructions for causing a controller to implement a method comprising:
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obtaining valve information while said valve operates in response to a plurality of setpoints determined for controlling said plant process, said valve operating through a series of gradual movements; said valve information including at least two of setpoint data, position data and pressure data; deriving at least one of step response, friction and spring range for said valve based on said valve information.
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Specification