Product category:
Oil & Gas Fiscal Flowmetering systems
News Release from: Skeltonhall | Subject: Low viscosity condensate meter prover
Edited by the Processingtalk Editorial
Team on 22 April 2004
Bi-directional meter prover for Snohvit
condensate
A 30-inch bi-directional meter prover supplied by Skeltonhall Limited of Sheffield, South Yorkshire, is on its way to the Statoil LNG plant at Melkoya Island outside Hammerfest in northern Norway
A 30-inch bi-directional meter prover supplied by Skeltonhall Limited of Sheffield, South Yorkshire, is on its way to the Statoil LNG plant at Melkoya Island outside Hammerfest in northern Norway The contract was placed with Skeltonhall by Holta and Haland Instrumentering A/S in Stavanger, Norway, who will supply the complete metering system to the Snohvit Project
This article was originally published on Processingtalk on 17 Jul 2003 at 8.00am (UK)
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The prover, designed to operate over a flowrate of 400 to 2860 cubic metres/hour on a low viscosity condensate, has an operating pressure of 6.4 barg and temperature range between 5 to 30 degrees Celsius.
It is provided with four calibrated volumes with a nominal 7.6 cubic metres between the ATEX certified Skeltonhall Micro-set Sphere Detectors.
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Design and materials are in compliance with the European Pressure Equipment Directive 97/23/EC.
Due to the aggressive nature of the product all the valves and small bore piping were made from stainless steel, and all large diameter carbon steel piping and components were lined with Saekaphen baked phenolic resin.
The LNG plant processes gas received from the Snohvit area that comprises the Snohvit, Albatross and Askeladd fields in the Barents Sea, some 140 kilometres northwest of Hammerfest.
Comprising mainly natural gas, with small quantities of condensate, the separated condensate is stored in a 75,000 cubic metre tank at ambient temperature, while awaiting shipment from the products terminal.
It is estimated that the fields contain 17.9 million cubic metres of condensate, which will be shipped over the life of the plant from 2005 to 2035, at a rate of between 500,000 and 900, 000 standard cubic metres per annum.
The metering system will measure the volume of condensate as it is loaded into marine tankers, and the Skeltonhall bi-directional prover will be used to check and calibrate the meters.
During the factory calibration of the meter prover, using the master-meter method, five runs were required to establish temperature stability and remove all air, and the following five cycles to calibrate the four volumes.
Justin Hall, Skeltonhall project manager, said that each full proving cycle of a forward and reverse run was taking 90 minutes due to the small size of the calibration meter and the large volume between detectors.
"The sphere was travelling at 0.019 metres per second" he said, "and it was quite a feat to achieve a calibration after so few runs at a flowrate far below the design operating range of the prover".
Calibration was carried out by Saybolt UK using a 3" Avery Hardol PD master meter and 500 litre calibration tank.
The four volumes achieved repeatabilities of between +0.003% and +0.0075%, against a Norsok standard that requires +0.01 per cent.
Justin put the good performance of the prover down to careful workmanship, meticulous quality assurance standards and the excellent repeatability of the Skeltonhall Micro-set Sphere Detectors.
Tractebel Gas Engineering Belgium SA is the main contractor for the storage tanks and ship loading systems.
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