Self-Diagnosing Differential Pressure Flow Meter With Angled Auxiliary Port
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Solution Overview
Problem
Differential pressure flow meters often struggle to accurately measure flow rates due to fouling, physical damage, or changes in the shape of the obstruction body, leading to inaccurate readings, which can result in lost revenue and safety issues.
Innovation Solution
The implementation of an auxiliary pressure port positioned at an angle between 0 and 90 degrees with respect to the conduit wall, in addition to conventional upstream and downstream pressure ports, to generate primary and auxiliary differential pressure measurement signals, allowing for the establishment of a baseline relationship and detection of changes over time, thereby diagnosing potential errors and generating alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure ports are used for differential pressure measurement, then the flow meter structure is simple, but the measurement accuracy deteriorates due to fouling and geometry changes
Solution Approach 1:
The pressure measurement function is segmented into multiple independent ports (primary upstream, primary downstream, auxiliary) that can be independently positioned and configured. This allows the system to separate the primary flow measurement function from the diagnostic function, enabling each port to serve its specific purpose while collectively providing both accurate measurement and self-diagnosis capabilities.
Solution Approach 2:
The auxiliary pressure port is positioned at an angle between 0 and 90 degrees with respect to the conduit wall, introducing a spatial dimension that enables diagnostic measurement. This angled positioning allows the port to sense pressure changes that indicate obstruction body geometry changes, while still being integrated into the existing conduit structure without significantly increasing overall system complexity.
2Reliability
If the obstruction body is used for flow measurement, then the differential pressure signal is generated, but the measurement reliability deteriorates when the obstruction body becomes fouled or damaged
Solution Approach 1:
The auxiliary pressure port provides a feedback mechanism that continuously monitors the operational status of the obstruction body. By comparing the differential pressure signal from the primary ports with the auxiliary port signal, the system can detect changes in the obstruction body geometry caused by fouling or damage, and generate alarms to alert users before measurement accuracy is significantly compromised.
Solution Approach 2:
The auxiliary pressure port performs preliminary detection of obstruction body changes before they severely impact flow measurement accuracy. By establishing a baseline relationship between the primary and auxiliary pressure signals during normal operation, the system can detect deviations early, allowing for preventive maintenance before measurement errors become critical.
3Difficulty of detecting and measuring
If multiple pressure ports are added for self-diagnosis, then the ability to detect geometry changes improves, but the device complexity increases
Solution Approach 1:
The auxiliary pressure port serves multiple functions: it provides a diagnostic signal for detecting obstruction body geometry changes, establishes a baseline relationship for self-calibration, and can be used to monitor system performance over time. This multi-functionality justifies the addition of the extra port by consolidating several diagnostic capabilities into a single component.
Solution Approach 2:
The system uses the auxiliary pressure port to perform self-diagnosis and self-calibration without requiring external intervention. The baseline relationship established between primary and auxiliary pressure signals enables the system to automatically detect and report on its own performance, reducing the need for manual calibration and maintenance operations.
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 configuration enhances the accuracy of flow measurements by enabling the detection of changes in the meter's geometry, reducing the likelihood of inaccurate readings and providing a self-calibrating system that alerts users to potential issues, thus ensuring reliable and continuous flow monitoring.
Implementation Method 1
generating at least a primary differential pressure measurement signal and an auxiliary differential pressure measurement signal using at least three different pressure ports
Implementation Method 2
A differential flow meter is based on Bernoulli's theorem and the conservation of mass of a fluid flow between two points in a flow
Data Source
AI summary
An aspect provides a method of metering flow through a fluid conduit having an obstruction therein, including: placing an obstruction body within the conduit; generating at least two differential pressure measurement signals using at least three different pressure ports, said at least three different pressure ports comprising: an upstream pressure port; a downstream pressure port; and an auxiliary pressure port; wherein at least one of the upstream pressure port, the downstream pressure port, and the auxiliary pressure port is positioned at an angle between 0 and 90 degrees with respect to a conduit wall; establishing a baseline relationship between the at least two differential pressure measurement signals; and determining if the baseline relationship between the at least two differential pressure measurement signals differs by a predetermined amount. Other aspects are described and claimed.