Omniflex Blog

~ How meter proving systems protect oil and gas businesses from financial and legal consequences ~

In the oil and gas industry, accuracy in flow measurement equals money. This is why meter provers are an essential quality assurance (QA) step in the sector as any discrepancies can lead to severe financial losses on, in extreme scenarios, have legal ramifications. Here Ian Loudon, international sales and marketing manager at remote monitoring specialist Omniflex, discusses the importance of meter proving and shares an example of a recent meter proving project the company delivered for Kalibra OGC Services to use at various facilities in Angola and Nigeria.

A meter prover is used to calibrate and verify the accuracy of flow meters, which measure the volume or mass of fluids, typically hydrocarbons, passing through a pipeline. Because even small measurement errors can lead to substantial financial losses, especially in the oil and gas sector, regularly proving meters is an important QA step.

Meter provers establish a traceable standard that a flow meter’s performance can be judged against. They are used to confirm that a meter’s readings fall within acceptable tolerance of a known reference volume, ensuring the reliability of custody transfer and fiscal metering systems.

Meter proving in the oil and gas sector

Modern oil and gas operations are deploying meter proving systems in increasingly challenging environments. Offshore platforms, arctic sites and remote terminals require automated, low-maintenance proving systems capable of working reliably under harsh conditions and limited human oversight.

Increasing digitalisation, such as integration with SCADA systems and remote diagnostics, makes it possible to remotely track meter performance and trigger proving cycles automatically, reducing downtime and human error.

A key example to consider in oil and gas settings is custody transfer scenarios where the ownership of crude oil, refined products or natural gas changes hands between suppliers, transporters and customers. Here, regulatory bodies and trading partners have strict accuracy tolerances, typically within ±0.05 to ±0.25 per cent. This can only be ensured by using a proven, traceable calibration process.

Without regular meter proving, flow meter accuracies can drift due to several factors, Calibration and electronic drift not withstanding wear and tear from harsh fluids and contaminants; temperature and pressure fluctuations impacting fluid density; mechanical degradation of moving components; and deposits and fouling that alter flow characteristics.

Meter provers make it possible to correct for these shifts, ensuring that the measured volumes are legally and financially defensible by employing technology to measure at levels 10fold what normal instrumentation standardizes on..

Calibrating master metering systems

When Kalibra OGC Services, accredited to ISO17025:2017 for the calibration of prover loops, needed help automating an already approved calibration rig used to calibrate prover loops using the Master Meter Method, it reached out to Omniflex.

Kalibra used Omniflex’s Maxiflex 4 Pulse Integrity (4PI) Module, Maxiflex 8 AI a 24bit resolution Analogue input module and Maxiflex Meter Prover Module to significantly enhance calibration accuracy, repeatability and reliability, ensuring the calibration rig’s equipment stays within acceptable limits and maintains adherence to international quality standards.

The automated system removes potential for human error by ensuring consistent and precise measurements while operating at a high flow rate, reducing the time required to calibrate prover loops and increasing efficiency.

The Meter Prover Module performs pulse interpolation for verifying the master meter according to the Manual of Petroleum Measurement Standards. It accepts four detector switch inputs from a prover loop and receives pulses from a flow meter, performing real-time pulse interpolation calculations.

The Maxiflex 4PI monitors accept inputs from up to four oil and gas turbine flow meters to detect and correct errors, ensuring accurate totalisation and output. The prover loop is calibrated using the master meter method, which is critical to the calibration process, ensuring measurements are accurate and reliable.

The calibration process adheres to requirements outlined in ISO/IEC 17025:2017, OIML D36 and OIML R117, ensuring compliance requirements are met at all times.

By following these guidelines, Kalibra OGC Services guarantees that all measurements are accurate and compliant with regulatory requirements. Omniflex’s equipment complies with ISO 6551, ensuring accurate measurement of petroleum products during financial and regulatory processes.

Meter provers are the cornerstone of measurement integrity in oil and gas. They protect revenue, maintain regulatory compliance, and build trust between trading partners. As the industry continues to automate and decentralise operations, the next generation of meter proving solutions, like the one developed between Omniflex and Kalibra, will play a pivotal role in ensuring every drop and cubic metre is accurately accounted for.

To ensure compliance and accuracy in oil and gas calibration with precise, real-time measurements, get in touch with Omniflex today to find the solution that can help you.