Predicting maintenance requirements for a valve assembly
First Claim
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1. A method, comprising:
- acquiring operating data that describes operation of a valve assembly on a process line;
calculating amplitude for stick-slip cycling and amplitude for setpoint cycling from the operating data;
calculating a maintenance variable, wherein the maintenance variable includes a pattern coefficient that modifies a value of the amplitude for stick-slip cycling and the amplitude for setpoint cycling;
comparing the maintenance variable to a threshold criteria related to the amplitude for stick-slip cycling and the amplitude for setpoint cycling, the threshold criteria delimiting data into two groups including a first group where a combination of stick-slip cycling and setpoint cycling indicates that stick-slip prevails on the valve assembly and a second group where the combination of stick-slip cycling and setpoint cycling indicates cycling of the valve assembly that results from process variations occurring on the process line;
wherein the maintenance variable is calculated in accordance with,
M=CiXi+Ci+nXi+n,wherein M is the maintenance variable, Ci is a first pattern coefficient, Xi is the amplitude for stick slip cycling, Ci+n is a second pattern coefficient, Xi+n is the amplitude for setpoint cycling, and n is an integer having consecutive values;
selecting a maintenance task according to a relationship between the maintenance variable and the threshold criteria, wherein the maintenance task relates to stick-slip on the valve assembly in response to the combination of stick-slip cycling and setpoint cycling is in the first group that is indicative of cycling that occurs on the valve assembly itself;
using the maintenance task to maintain operation of the process line on which the valve assembly is installed by,generating an output in the form of an alert that corresponds with corrective action to the valve assembly; and
causing the valve assembly to modulate operation of the valve to change flow through the valve assembly in response to a control signal that relates to the alert so as to avoid a failure condition on the valve assembly that would disrupt operation of the process line.
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Abstract
A system and method for predicting failure conditions on a valve assembly. The method can include stages for comparing a maintenance variable to a threshold criteria, each related to an operating feature that uses operating data to quantify operation of a valve assembly, the threshold criteria associating an operating pattern found in the operating data with a failure mode on the valve assembly. The method can also include stages for selecting a maintenance task according to a relationship between the maintenance variable and the threshold criteria, the maintenance task related to the failure mode. The method can further include stages for generating an output conveying the maintenance task.
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Citations
8 Claims
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1. A method, comprising:
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acquiring operating data that describes operation of a valve assembly on a process line; calculating amplitude for stick-slip cycling and amplitude for setpoint cycling from the operating data; calculating a maintenance variable, wherein the maintenance variable includes a pattern coefficient that modifies a value of the amplitude for stick-slip cycling and the amplitude for setpoint cycling; comparing the maintenance variable to a threshold criteria related to the amplitude for stick-slip cycling and the amplitude for setpoint cycling, the threshold criteria delimiting data into two groups including a first group where a combination of stick-slip cycling and setpoint cycling indicates that stick-slip prevails on the valve assembly and a second group where the combination of stick-slip cycling and setpoint cycling indicates cycling of the valve assembly that results from process variations occurring on the process line; wherein the maintenance variable is calculated in accordance with,
M=CiXi+Ci+nXi+n,wherein M is the maintenance variable, Ci is a first pattern coefficient, Xi is the amplitude for stick slip cycling, Ci+n is a second pattern coefficient, Xi+n is the amplitude for setpoint cycling, and n is an integer having consecutive values; selecting a maintenance task according to a relationship between the maintenance variable and the threshold criteria, wherein the maintenance task relates to stick-slip on the valve assembly in response to the combination of stick-slip cycling and setpoint cycling is in the first group that is indicative of cycling that occurs on the valve assembly itself; using the maintenance task to maintain operation of the process line on which the valve assembly is installed by, generating an output in the form of an alert that corresponds with corrective action to the valve assembly; and causing the valve assembly to modulate operation of the valve to change flow through the valve assembly in response to a control signal that relates to the alert so as to avoid a failure condition on the valve assembly that would disrupt operation of the process line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification