Bidirectional Sphere Prover Straight Pipe Accuracy
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Solution Overview
Problem
Current bidirectional sphere meter proving systems for custody transfer in the oil industry face inaccuracies due to thermal expansion, flanges, and welds, which introduce errors and require costly machined components, and often necessitate pulse interpolation.
Innovation Solution
A bidirectional sphere meter proving system utilizing a straight calibrated section of pipe without flanges, welds, or elbows, allowing for accurate and cost-effective measurement with reduced pressure drop and the ability to produce evenly spaced pulses without the need for interpolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional bidirectional sphere meter proving systems use flanges, welds, and elbows in the calibrated section, then the system can be assembled with standard components, but measurement accuracy deteriorates due to thermal expansion, flange misalignment, and weld irregularities
Solution Approach 1:
The invention extracts and removes the problematic elements (flanges, welds, elbows) from the calibrated straight section of the prover. By eliminating these components from the measurement zone, the system achieves higher measurement accuracy without thermal expansion errors, flange misalignment issues, or weld irregularities that would otherwise interfere with the sphere's movement and pulse generation.
Solution Approach 2:
The prover system is segmented into distinct zones: a calibrated straight section free of flanges and welds for accurate measurement, and separate assembly areas where flanges and connections exist but do not interfere with the measurement zone. This segmentation allows standard components to be used while maintaining measurement integrity in the critical calibrated section.
2Measurement precision
If machined flanges and special components are used to ensure alignment, then measurement accuracy improves, but manufacturing costs and device complexity increase
Solution Approach 1:
The invention removes flanges and welded connections from the calibrated straight section entirely, eliminating the need for expensive machined flanges and precision alignment work. The straight section is manufactured as a simple continuous pipe, dramatically reducing manufacturing costs while maintaining measurement accuracy.
Solution Approach 2:
The calibrated straight section uses simple, inexpensive standard pipe without requiring precision-machined components. By using basic pipe and eliminating the need for expensive machined flanges and complex assembly, the system achieves high accuracy at low manufacturing cost.
3Ease of operation
If the calibrated section contains flanges and welds, then assembly is simplified, but pulse spacing becomes uneven requiring interpolation
Solution Approach 1:
The invention removes flanges and welds from the calibrated straight section, eliminating the sources of irregularity that cause uneven pulse spacing. This ensures uniform pulse generation as the sphere passes through the straight section, eliminating the need for pulse interpolation while maintaining assembly simplicity through separate connection zones.
4Ease of manufacture
If standard flanges and welds are used in the calibrated section, then manufacturing is easier, but pressure drop increases due to flow disturbances
Solution Approach 1:
The invention extracts flanges, welds, and elbows from the calibrated straight section, eliminating flow disturbances that cause pressure drop. The smooth, continuous straight section allows uninterrupted fluid flow, reducing energy loss while manufacturing remains simple through separate assembly of the straight section with standard connections at the ends.
Data Source
AI summary
A bidirectional sphere prover is used to check the accuracy of a custody transfer meter when fluids, such as crude oil or gasoline are bought and sold. The bidirectional sphere prover of the present invention uses a straight calibrated section of pipe between the detection switches, the straight calibrated section of pipe being free of welds, flanges and elbows.