Ball Valve Diagnostics for Leak, Misalignment, and Pig Tracking
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Solution Overview
Problem
Industrial ball valves face challenges in detecting malfunction and component failures, particularly in isolating leaks and misalignment, which can lead to inefficiencies and damage, such as pig trapping, without effective diagnostic systems.
Innovation Solution
A diagnostic and performance monitoring system is integrated into ball valves, utilizing sensors, a logic solver, and communication devices to quantify torque, position, leaks, and misalignment, enabling real-time data logging and remote evaluation, and including features like seat leak flow measurement and pig position estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diagnostic and performance monitoring system is integrated into ball valves, then reliability is improved through detection of malfunction and component failures, but device complexity increases due to additional sensors, controllers, and communication devices
Solution Approach 1:
The patent integrates multiple diagnostic functions (torque sensing, position monitoring, leak detection, pig location) into a single unified system within the valve assembly. The controller consolidates data from multiple sensors and performs various diagnostic calculations, merging what could be separate monitoring systems into one integrated solution that improves reliability without proportionally increasing complexity.
Solution Approach 2:
The diagnostic system is designed to perform multiple functions simultaneously: monitoring valve torque, tracking stem position, detecting seat leaks, identifying packing leaks, and locating pipeline pigs. This multi-functional approach allows a single system to address various failure modes, improving overall reliability while avoiding the need for separate specialized devices for each function.
2Measurement precision
If sensors and monitoring devices are added to the valve, then measurement precision is improved for torque, position, and leaks, but ease of manufacture decreases due to more complex assembly requirements
Solution Approach 1:
The valve is divided into functional modules: the valve body, the actuator, the diagnostic system with sensors, and the controller. This segmentation allows each component to be manufactured and tested independently, then assembled together. The diagnostic system can be pre-assembled as a unit, reducing the complexity of final assembly while maintaining high measurement precision for torque, position, and leak detection.
3Loss of information
If real-time data logging and remote evaluation capabilities are implemented, then loss of information is reduced through continuous monitoring, but device complexity increases due to communication devices and data processing systems
Solution Approach 1:
The controller acts as an intermediary between the sensors and the remote monitoring system. It collects data from multiple sensors, processes the information locally, and then transmits consolidated data remotely. This intermediary function reduces the information loss by ensuring data is captured and processed accurately, while the communication complexity is contained within the controller rather than distributed across all components.
4Productivity
If the system monitors multiple parameters including torque, position, leaks, and pig location, then productivity is improved through preventive maintenance, but device complexity increases due to multiple sensors and measurement apparatus
Solution Approach 1:
The system continuously monitors multiple parameters (torque, position, leaks, pig location) to detect early signs of malfunction before they lead to failures. By performing preliminary detection and alerting operators to potential issues, the system enables preventive maintenance actions that can be taken before productivity is impacted by valve failures or unexpected downtime.
Data Source
AI summary
A ball valve for use in industrial pipelines is described. The ball valve includes: a valve body; an inlet closure piece attached to the valve body; an outlet closure piece, the valve body, the inlet closure piece, and the outlet closure piece together defining an interior cavity; a ball disposed in the interior cavity, the ball defining a bore extending through the ball; a valve seat adjacent the ball; a first strain sensor mounted on the inlet closure piece; a second strain sensor mounted on the outlet closure piece; a seat misalignment sensor system including a ring sensor and a magnetized insert ring disposed in the valve seat; and an electronic controller system in communication with the first strain sensor and the second strain sensor, the electronic control system configured: to estimate the position of a pig passing through the valve; and to identify valve seat misalignment.