Conditioning Orifice Plate for Accurate Short-Run Flow Measurement
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Solution Overview
Problem
Orifice plate flow meters suffer from reduced accuracy in short pipe runs due to asymmetry in fluid velocity profiles caused by upstream fittings, requiring extensive laboratory calibration for each configuration, limiting their application in various process setups.
Innovation Solution
A conditioning orifice plate design with four evenly spaced circular orifices and a consistent geometric configuration across different pipe sizes, eliminating the need for empirical calibration by using a unique discharge coefficient equation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-bore orifice plate is used in short pipe runs with upstream fittings, then the device structure is simple, but measurement accuracy deteriorates due to asymmetric velocity profiles
Solution Approach 1:
The single-bore orifice plate is segmented into multiple bores (typically four) arranged symmetrically around the centerline. This segmentation allows the device to sample velocity profiles at multiple locations, effectively averaging out asymmetric velocity distributions caused by upstream fittings while maintaining structural simplicity.
2Measurement precision
If a conditioning orifice plate with multiple bore configurations is used for different pipe schedules, then measurement accuracy improves, but device complexity and calibration requirements increase
Solution Approach 1:
A universal conditioning orifice plate design is created with standardized bore configurations that can be applied across multiple pipe schedules. The plate incorporates four bores with specific diameter ratios and spacing arrangements that provide consistent performance across different pipe sizes, eliminating the need for extensive customization and calibration for each pipe schedule.
3Measurement precision
If extensive laboratory characterization is performed for each COP design configuration, then measurement accuracy improves, but time consumption and cost increase
Solution Approach 1:
The invention identifies and standardizes key geometric parameters (bore diameter ratios, spacing arrangements, plate thickness) that govern the conditioning orifice plate performance. By establishing standardized parameter sets for different pipe schedules, the need for extensive laboratory characterization is eliminated, as the standardized configurations have predictable performance characteristics.
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
Provides accurate flow rate measurements without calibration for non-standard pipe schedules, enhancing measurement accuracy and reducing the need for extensive laboratory analysis.
Implementation Method 1
measuring, by a differential pressure, the volumetric rate of fluid flowing
Implementation Method 2
the velocity profile of the fluid is asymmetric with respect to the longitudinal axis of the conduit
Data Source
AI summary
A differential pressure fluid flow meter measures flow of a fluid based upon a differential pressure. An orifice plate is selected from a plurality of orifice plates configured to be positioned between upstream and the downstream taps in the conduit. Four evenly spaced circular orifices allow the flow of fluid there through and create the differential pressure which is a function of fluid flow rate. Xdc is a distance in a direction perpendicular to an axis of the conduit from the nearest outer circumference of the circular orifices to a projection of a center of the downstream tap on the flat orifice plate. Xed is a distance between outer circumferences of two opposed circular orifices. Rb is a ratio of the diameter that locates the centers of the four circular orifices and the interior diameter of the conduit. Xdc and Xed are each a function of Rb.