Flow Restrictor Pressure Validation for Flow Meter Fault Detection
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Solution Overview
Problem
Existing flow meter systems in industrial processes face disruptions, safety issues, and environmental damage due to potential failures, which are difficult to detect and address promptly, as they rely solely on primary measurements without secondary validation.
Innovation Solution
The method involves using a flow restrictor and upstream/downstream pressure measurements to estimate flow rates, comparing these estimates with actual measurements from flow meters, and determining if a problem exists, allowing for timely corrective actions such as generating warnings or scheduling maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow meters are used to measure material flows in industrial processes, then flow measurement capability is provided, but system reliability deteriorates due to undetected failures causing disruptions, safety issues, and environmental damage
Solution Approach 1:
The system implements feedback by continuously comparing actual flow meter measurements with estimated flow measurements derived from pressure differential measurements across a flow restrictor. When the difference between actual and estimated measurements exceeds a threshold, the system generates an alarm signal, creating a closed-loop validation mechanism that detects flow meter failures and prevents harmful outcomes.
Solution Approach 2:
The system introduces an intermediary estimation mechanism that uses pressure differential measurements across a flow restrictor to generate estimated flow values. This intermediary serves as a independent validation channel that does not rely on the flow meter, allowing detection of flow meter failures through comparison of the two measurement sources.
2Measurement precision
If only primary flow meter measurements are used, then device complexity is minimized, but measurement precision deteriorates due to lack of validation leading to undetected failures
Solution Approach 1:
The system introduces an intermediary estimation mechanism that uses pressure differential measurements across a flow restrictor to generate estimated flow values. This intermediary serves as a independent validation channel that does not rely on the flow meter, allowing detection of flow meter failures through comparison of the two measurement sources.
Solution Approach 2:
The system creates a digital twin or copy of the flow measurement function by using pressure differential measurements to estimate flow rates. This copied measurement approach provides an independent validation mechanism that can detect failures in the primary flow meter without requiring additional complex hardware.
3Loss of time
If flow meter failures go undetected, then loss of time for detection is minimized (immediate detection), but loss of time for corrective action increases due to delayed response to disruptions and safety issues
Solution Approach 1:
The system implements feedback by continuously comparing actual flow meter measurements with estimated flow measurements derived from pressure differential measurements across a flow restrictor. When the difference between actual and estimated measurements exceeds a threshold, the system generates an alarm signal, creating a closed-loop validation mechanism that detects flow meter failures and prevents harmful outcomes.
Solution Approach 2:
The system performs preliminary validation by continuously monitoring the comparison between actual and estimated flow measurements before failures can cause significant disruptions. The continuous comparison and alarm generation enable early detection of flow meter degradation or failure, allowing preventive maintenance actions to be taken before process disruptions or safety issues occur.
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 approach reduces disruptions, safety issues, and environmental damage by validating flow meter measurements, identifying potential problems, and enabling the use of digital twins to maintain process integrity until issues are resolved.
Implementation Method 1
obtaining pressure measurements associated with a fluid passing through a flow restrictor, wherein the pressure measurements indicate pressures upstream and downstream from the flow restrictor
Data Source
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AI summary
A method includes obtaining (704) pressure measurements associated with fluid that passes through a flow restrictor (202), where the pressure measurements identify pressures upstream and downstream from the flow restrictor. The method also includes generating (706) estimated flow measurements based on the pressure measurements. The method further includes comparing (708) the estimated flow measurements and actual flow measurements generated by a flow meter (210) that is fluidly coupled to the flow restrictor. In addition, the method includes determining (710) whether a problem exists based on the comparison. The flow restrictor could provide a fixed restriction or a variable restriction for the fluid. An overall loss coefficient associated with the flow restrictor could be used to generate an estimated flow measurement.