Digital Valve Controller Emergency Shutdown Testing
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Solution Overview
Problem
Current emergency shutdown valve testing methods are inefficient, often performed at infrequent intervals due to cumbersome procedures, leaving equipment unavailable for actual emergencies and failing to reliably verify the operability of both emergency shutdown devices and their supporting equipment, such as solenoids, within fluid process control systems.
Innovation Solution
A digital valve controller (DVC) system that includes pressure sensors and a testing routine to assess the operational health of solenoid valves by monitoring pressure changes during a partial stroke test, using a derivative calculation to determine solenoid valve health and ensuring the system can quickly return to a safe state during emergencies, while also being part of a closed-loop distributed process control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emergency shutdown valves are tested periodically at predetermined intervals, then the testing can be performed with minimal disruption to operations, but the frequency is insufficient to reliably verify operability and leaves equipment unavailable during actual emergencies
Solution Approach 1:
The system performs automated periodic testing of emergency shutdown valves and solenoid devices at predetermined intervals without requiring manual intervention. The controller automatically initiates stroke tests, monitors valve response, and returns valves to normal positions, enabling frequent reliable verification while minimizing operational disruption through systematic automated scheduling of tests.
Solution Approach 2:
The emergency shutdown system performs self-testing through automated stroke tests that require no external manual operation. The controller automatically commands valves to test positions, monitors their response through position indicators, and returns them to normal positions, enabling the system to verify its own operability independently and continuously without requiring external personnel or resources.
2Reliability
If comprehensive testing of supporting equipment such as solenoid valves is performed, then complete operability can be verified, but the device complexity and testing procedure burden increase
Solution Approach 1:
The system merges the testing of multiple components (emergency shutdown valves and solenoid devices) into a single integrated automated procedure. The controller simultaneously commands both valve stroke tests and solenoid operability tests, monitors their responses through integrated indicators, and manages their return to normal positions, verifying complete system operability through one unified testing sequence rather than separate complex procedures.
Solution Approach 2:
The system replaces manual mechanical testing procedures with automated electronic control and monitoring. Instead of physical manual operation of valves and solenoids during testing, the controller electronically commands test sequences, automatically monitors position indicators and responses, and manages the return to normal positions, significantly reducing procedural complexity while maintaining comprehensive verification of all components.
3Adaptability or versatility
If manual testing procedures are used, then flexibility in testing different configurations is possible, but the procedures are cumbersome and require significant manpower
Solution Approach 1:
The controller is designed as a universal multi-functional device that can automatically test various types of emergency shutdown valves and solenoid devices across different process control configurations. Through programmable test sequences and adaptable monitoring of different indicator types, the single controller handles diverse testing requirements, eliminating the need for separate manual procedures for each device type while maintaining flexibility across configurations.
Solution Approach 2:
The system replaces manual mechanical testing operations with automated electronic control and monitoring. The controller electronically commands test sequences, automatically monitors position indicators and device responses, and manages return to normal positions, eliminating cumbersome manual procedures and significant manpower requirements while maintaining adaptability to different valve and solenoid configurations through programmable test routines.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable and efficient testing of emergency shutdown valves and their supporting equipment, ensuring they can function correctly during emergencies, reducing downtime and improving safety by using a universal testing system that can be applied across various types of emergency shutdown devices and configurations.
Implementation Method 1
A digital valve controller (DVC) system that includes pressure sensors and a testing routine to assess the operational health of solenoid valves by monitoring pressure changes during a partial stroke test
Implementation Method 2
using a derivative calculation to determine solenoid valve health
Data Source
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AI summary
A method of monitoring a fluid process control system having a control loop for controlling the flow of a material through a path in the fluid process control system. The control loop includes a control valve (12) disposed in the path which is movable between an open position and a closed position; a valve controller (16) for controlling movement of the control valve, and a fluid control line (34,36) coupling the valve controller to the control valve. The method comprises detecting a first pressure at a location in the control loop with a first pressure sensor (40) disposed on-board the valve controller; detecting a second pressure at a location in the fluid process control system that is external to the control loop with a second pressure sensor (42) disposed on-board the valve controller, and determining a characteristic of the control loop based on the first pressure.