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Metering of waxy crude oil

Metering of waxy crude oil

Metering of waxy crude oil

(OP)
We run a refinery which receives its crude down a pipeline owned and metered by a third party using Corilis meters, which are the contractual custody transfer point. This crude is extremely waxy, which means that pour point depressants and heating is used down the line. We have noticed when reconciling these third party metered receipts against our own tank dips, that the difference between the measurement methods varies over the year, showing a significant loss for us in winter. Our investigations are showing that it is more than likely that it is the Coriolis which is inaccurate, showing higher flows than real in winter, maybe by as much as 1.5% (as compared to the expected accuracy of less than 0.15%). We wonder if wax is crystallising out, and interfering with the meter. Does anyone have any idea what might be happening, or have previous experience? Thank you.

RE: Metering of waxy crude oil

Could it be a build in the meter loop up? Considering the working principle of a coriolis meter i would assume that it was sensitive to such a thing?

Best regards

Morten

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