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Cryogenic fluid custody transfer with coriolis flow meters

12 September 2011

LNG applications specialist, Cryostar is using Emerson's Micro Motion coriolis flow meters in LNG fuel dispensers, a choice based not only on the inherent accuracy of these units, but also because regulatory organisations in Europe, Asia, Australia and the US have approved them for cryogenic fluid custody transfer applications. Cryostar's Philippe Fauvel takes up the story:

“When we were designing our fuel dispensers, we looked at various measurement technologies and several potential suppliers. Emerson’s flow meters have all the approvals we need for our growing markets, as well as providing the accurate and reliable data that this fiscal application demands. This project has been very much a joint development with Emerson who helped with obtaining MID approval. We used their valuable LNG knowledge and experience to achieve the best possible design, making our dispensers among the most accurate and reliable on the market.”

The Cryostar dispenser, which is 99.5 per cent accurate, has been approved to relevant standards by Weights and Measures authorities throughout the world. These include MID (Europe) and Nederlands Meet Instituut (NMI) for Australia and Asia. Cryostar is also seeking National Type Evaluation Program (NTEP) approval for customers in North America.

MID certification means that when these flowmeters are used as a component of a complete measuring system, such as Cryostar's fuel dispenser, it is not necessary for the dispenser manufacturer to type test and certify the devices, saving both time and money.

In this application, a Micro Motion ELITE CMF100 flow meter measures mass flow, which avoids the need for separate fluid density compensation typically required by traditional volumetric methods. This reduces costs and measurement uncertainty while simplifying installation. Moreover, Micro Motion meters do not require straight pipe runs or flow conditioning devices, enabling compact and efficient skid-mounted metering systems.

Micro Motion flow meters have no moving parts, so they are inherently reliable. And as far as LNG dispensing is concerned, they provide accurate, real-time, in-line measurement data, while also meeting ATEX safety requirements.


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