Flow Meter On-Site Calibration via Simulated Transit Time Pulses
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Solution Overview
Problem
Existing flow meter calibration methods are cumbersome, costly, and often cannot accurately calibrate across the full range of flow velocities, especially at high rates like 300 feet/second, due to the need for offsite calibration and potential system downtime, and may not account for erosion or contaminant effects on transducer signals.
Innovation Solution
A calibration system that includes a probe for on-site sound speed measurement and a flow simulator to generate simulated transit time pulses, allowing for precise adjustment of transit time differentials and fluid flow velocity calculations, enabling accurate calibration with minimal system disruption and no downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offsite calibration is performed using calipers and CMM, then measurement precision is improved, but loss of time and productivity deteriorate due to system downtime and resource expenditure
Solution Approach 1:
The patent uses a flow simulator that generates simulated transit time signal pulses to copy the behavior of actual fluid flow through the pipe. This allows calibration to be performed on-site without removing the flow meter, as the simulator creates virtual flow conditions that mimic real operating scenarios, eliminating the need for offsite calibration while maintaining measurement precision
Solution Approach 2:
The flow simulator acts as an intermediary device between the flow meter and the calibration process. Instead of directly calibrating the flow meter in-situ without proper reference, the simulator provides a controlled intermediate system that generates known transit time values, enabling accurate calibration while keeping the flow meter installed in the pipeline
2Measurement precision
If offsite calibration is performed, then measurement precision is improved, but device complexity and resource expenditure worsen
Solution Approach 1:
The flow simulator creates simplified copies of actual flow conditions through simulated transit time pulses, avoiding the complexity of physical flow generation. The system uses signal processing to mimic fluid flow behavior without requiring complex hydraulic or pneumatic test setups, reducing overall system complexity while maintaining calibration accuracy
Solution Approach 2:
The patent replaces mechanical calibration methods (physical flow generation, disassembly, and manual measurement with calipers and CMM) with an electronic signal-based flow simulator. The simulator generates electrical signals that represent transit time data, substituting mechanical complexity with electronic signal processing, thereby simplifying the calibration system while improving precision
3Measurement precision
If calibration is performed across full flow velocity range, then measurement precision is improved, but ease of operation worsens due to inability to achieve high flow rates during calibration
Solution Approach 1:
The flow simulator allows calibration across the full flow velocity range by electronically adjusting the simulated transit time parameters without requiring actual changes in physical flow rate. The system can generate simulated signals representing any transit time value within the operational range, enabling calibration at high flow rates (such as 300 feet/second) without needing to physically achieve those flow conditions during calibration
Solution Approach 2:
The simulator creates virtual copies of high-velocity flow conditions through signal generation, allowing the flow meter to be calibrated for high flow rates without actually running high-speed fluid through the pipe during calibration. This copying approach simplifies operation by decoupling the calibration process from the physical constraints of achieving extreme flow rates
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
The system provides cost-effective, precise, and accurate on-site calibration of flow meters, improving sound speed and transit time measurements, and can be applied to any flow meter type, ensuring accurate fluid flow monitoring with reduced downtime and resource expenditure.
Implementation Method 1
Ultrasonic transducers are often employed to measure flow velocity based on the transit time of ultrasonic signals transmitted through the fluid
Implementation Method 2
Flow velocity is then computed as a function of the transit times of the ultrasonic signals both with and against the direction of flow
Data Source
AI summary
A calibration system for a flow meter includes a flow simulator, the flow simulator including a receiver configured to receive flow meter transducer signals from a flow meter. A simulation subsystem is configured to create simulated transit time signal pulses, and to transmit the simulated transit time signal pulses to the flow meter at preselected time intervals. A calibration subsystem is configured to receive from the flow meter a transit time differential value generated by the flow meter based on the simulated transit time signal pulses and output a calibration factor to the flow meter.