DNV GL has introduced a new technology qualification scheme to assure accuracy of gas-flow metering in field conditions. 

The company claimed that there is no independent technology qualification scheme available for high-end fiscal gas meters under field conditions, which will result in the industry facing high risks for metering errors, potentially causing revenue loss running into millions of euros.

DNV GL’s new qualification scheme aims to provide field robustness of these meters.

DNV GL senior vice-president for oil and gas Liv Hovem said: “The operational use of a flow meter in field applications can be distorted by many factors. The presence of liquids, dust, accumulated dirt on the inside of the pipe and meter, as well as vibrations and pulsations or a noisy valve, all of these factors can severely influence the results.

"These difficult field conditions can lead to inaccuracies in metering after design and installation and pose a major financial risk for metering system operators. DNV GL’s new qualification scheme provides assurance of the meter’s field robustness.”

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DNV GL consultant for flow and acoustics senior principal Henk Riezebos said: “The new scheme is risk-based and assesses to what extent the meter is being influenced by field distortions.

"It ensures greater accuracy in the field for higher value metering, thereby reducing the potential loss of revenue.

"When the technology qualification process has been completed for a flow meter, a technology certificate is issued in which robustness claims are verified for the specific technology.”  

"It ensures greater accuracy in the field for higher value metering, reducing the potential loss of revenue."

The technology qualification scheme is based on DNV GL’s Recommended Practice (RP) DNV-RP-A203 Technology Qualification. This process is widely accepted and applied for new technology, especially in offshore applications. 

The TQ process is a methodology developed with particular acceptance criteria for technology under review and can be applied during any stage of the development lifecycle of systems or technology. 

Two of DNV GL’s laboratories are qualified to do the testing and verification of high-end meters: Groningen Gas and Multiphase Flow Laboratories in the Netherlands and the Flow Centre in Durham, UK.

The labs have accurate flow references to determine how metering systems will react on several real-life field distortions.

As well as testing in its own laboratories, DNV GL provides independent verification of field robustness testing performed at other laboratories or in field applications as part of the verification process.

Image: Liv Hovem, senior vice-president of DNV GL oil and gas.  Photo: courtesy of Dnvgl.com.