In-Line Pressure Safety Valve Leak Testing by Acoustic Detection
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Solution Overview
Problem
Current methods for maintaining and testing Pressure Safety Valves (PSVs) are costly and time-consuming, requiring frequent removal from pipelines for maintenance, which can lead to increased maintenance costs and potential safety hazards due to faults in 2%-3% of tested units.
Innovation Solution
A system and method for in-line testing and calibration of PSVs using Abnormal Condition Detection Units (ACD) that allow for remote operation, reducing maintenance time and costs by detecting valve opening, leakage, and ensuring safe operating positions without disconnection, utilizing sound-based detection and automated pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSVs are removed from pipelines for maintenance and testing, then testing accuracy and reliability are improved, but maintenance time and production loss increase
Solution Approach 1:
The invention extracts the testing function from the traditional offline maintenance process and implements it as an in-line testing capability. By installing testing devices directly on the PSV assembly, the system can perform comprehensive tests (opening pressure, closing pressure, leakage) while the valve remains installed in the pipeline, eliminating the need for removal and associated production loss.
Solution Approach 2:
The invention introduces intermediary testing devices (test connections, pressure gauges, flow meters) that mediate between the PSV and the testing system. These intermediaries enable accurate measurement of opening pressure, closing pressure, and leakage without requiring valve removal, thus maintaining testing accuracy while avoiding production interruption.
2Reliability
If PSVs are tested frequently to ensure safety, then safety reliability is improved, but maintenance costs and production disruption increase
Solution Approach 1:
The in-line testing system performs multiple testing functions (opening pressure test, closing pressure test, leakage test) through a single integrated setup. The same test connections and measurement devices enable comprehensive validation of PSV performance without requiring separate testing procedures or valve removal, thereby maintaining safety reliability while simplifying the maintenance process.
Solution Approach 2:
The system enables self-testing capability where the PSV can be validated in its installed position without requiring complex external testing equipment or shutdown procedures. The in-line testing devices allow operators to perform complete safety validation during normal operation, reducing the need for frequent scheduled maintenance and associated production disruption.
3Measurement precision
If PSVs are taken out of service for calibration, then calibration accuracy is improved, but operational availability decreases
Solution Approach 1:
The in-line testing system performs calibration validation actions preliminarily during normal operation. By continuously monitoring and periodically testing the PSV's opening and closing pressures in-situ, the system ensures calibration accuracy is maintained without requiring removal for bench calibration, thus preserving operational availability while achieving calibration objectives.
Solution Approach 2:
The invention replaces the traditional mechanical removal and bench-calibration process with an in-line electronic measurement and control system. Pressure transducers, flow meters, and control valves enable precise calibration verification while the PSV remains installed, substituting physical removal with electronic sensing and actuation to maintain both accuracy and availability.
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 faster and more efficient testing and calibration of PSVs, extending maintenance intervals up to 6 years, reducing maintenance costs, and ensuring safety by detecting faults early and preventing accidents through remote operation and automated processes.
Implementation Method 1
utilizing sound-based detection and automated pressure control
Data Source
AI summary
It is described an in-line safe pressure test system and method for detecting leaks in a pressure safety valve PSV (100), the valve including an inlet (P1), outlet (P2) and valve seat controlling fluid flow between said inlet and outlet. The system includes a Safety Controller SC (110) with a test fluid source, at least one Abnormal Condition Detector ACD unit, controller, data storage unit, and communication means for sending and receiving signals from/to the SC and an external safety system, wherein the SC is adapted to apply a test pressure to the inlet side of the PSV until the test pressure exceeds a set opening pressure of the PSV and the valve seat starts lifting, detect the sound caused by vibrations from the first small leak past the valve seat, record and store the value of said test pressure and/or report said test pressure via said communication means.