Control Valve Diaphragm Elastic Sensing for Early Fault Detection

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Solution Overview

Problem

Pneumatic control valves in the oil and gas industry often experience diaphragm failures before planned maintenance events, leading to costly operational disruptions.

Innovation Solution

An elastic sensing element is integrated onto the diaphragm of pneumatic control valves to monitor elasticity, generating baseline and periodic sensor records, and triggering an alarm when measurements deviate from the baseline by a predetermined threshold, facilitating timely maintenance operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If diaphragm inspection is performed only during planned turnaround and inspection events, then maintenance cost and operational complexity are reduced, but the risk of unexpected diaphragm failure increases

Engineering Contradiction:

Improvediaphragm failure detection reliabilityVSAvoidmonitoring system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces manual mechanical inspection methods with an optical sensing system that uses light interaction to detect diaphragm health status. The optical sensor measures changes in light properties (such as reflectivity or transmission) to determine diaphragm condition, eliminating the need for physical disassembly and visual inspection by personnel.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The diaphragm incorporates an integrated optical sensor that autonomously monitors its own health status without requiring external inspection equipment or personnel intervention. The sensor continuously or periodically assesses diaphragm conditions and can trigger alerts or shutdowns based on detected anomalies, enabling the component to self-diagnose its state.

Inventive Principle:

Principle #25Self-service

2Productivity

If diaphragm is treated as run-to-fail component without monitoring, then device complexity is minimized, but productivity loss due to unexpected failures increases

Engineering Contradiction:

Improveoperational continuityVSAvoidsensor integration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The optical sensor detects early signs of diaphragm degradation, cracking, or delamination before these defects lead to complete failure. By identifying potential issues in advance, the system allows for planned maintenance interventions during scheduled shutdowns rather than experiencing unexpected failures that disrupt production.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The sensor provides continuous feedback on diaphragm health status to the control system. When the sensor detects anomalies indicating diaphragm deterioration, it generates signals that can trigger maintenance alerts or automatic shutdown sequences, enabling proactive management of diaphragm condition and preventing catastrophic failures.

Inventive Principle:

Principle #23Feedback

3Reliability

If comprehensive monitoring system is implemented, then early failure detection capability is improved, but manufacturing cost increases

Engineering Contradiction:

Improvefailure detection capabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The optical sensor serves multiple functions: it monitors diaphragm health status, detects various defect types (cracks, delamination, deformation), and can potentially be adapted to monitor other valve components. This multi-functionality justifies the added manufacturing cost by providing comprehensive monitoring capabilities from a single integrated component.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This solution enables early detection of diaphragm failure, reducing unexpected shutdowns and maintenance costs by allowing for proactive replacement, thereby enhancing operational reliability and efficiency.

Implementation Method 1

an elastic sensing element disposed on the diaphragm for early failure detection

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

generating, using the elastic sensing element, a baseline sensor record comprising initial elasticity measurements of the diaphragm

Methodology Applied

Scientific EffectStrain measurement: Deformation

Data Source

PatentUS12140249B2Utilizing elastic sensing elements as a monitoring technique for early fault detection of control valve diaphragm failure

Publication Date: 2024.11.12 SAUDI ARABIAN OIL CO

AI summary

A method for early detection of control valve diaphragm failure is disclosed. The method includes disposing an elastic sensing element on a diaphragm of a pneumatic control valve, generating, using the elastic sensing element, a baseline sensor record comprising initial elasticity measurements of the diaphragm, generating, using the elastic sensing element and during a useful life of the control valve, a sequence of periodic sensor records comprising periodic elasticity measurements of the diaphragm, generating, in response to any periodic sensor record differs from the baseline sensor record by a pre-determined threshold, an alarm, and performing, in response to the alarm, a maintenance operation of the control valve.