Flow measurement solutions for custody transfer |
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Custody transfer at Preemraff Lysekil in Sweden |
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The loading and off loading of crude oil at Preemraff refinery in Sweden requires detailed information on quantities and mass due to the large transfer and high value involved. Consequently, a decrease in the uncertainty of only 0.1% results in huge savings and a short pay back time. Replacing the old Turbine meters, Endress+Hauser Promass Coriolis mass flow meters allow these benefits to be reached by increasing the accuracy in the measurement. |
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Promass installation at Preemraff Lysekil on an existing jetty replacing an old turbine meter and filter.
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Preemraff Lysekil is one of two oil refineries operated by Preem Petroleum AB, Sweden. They refine 255,000 barrels of crude oil per day, imported by tanker from various overseas sources, with 65 % of refined products exported again to Northern Europe and the USA. Initially, two existing turbine meters proved to be unable to achieve the necessary accuracy for the shore-to-ship transfer of refined products.
Solution
Large size Promass meters replaced the older type turbine meters. Promass provides direct mass measurement and is independent of changes in density and viscosity. It is small in size, requiring only a small footprint. Additional support is only needed for its weight, making replacement very easy and limiting additional costs for installation.
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Installation of tandem Promass meters on new Preemraff jetty
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|  | Loading the right mass
Promass provides a direct and highly accurate mass measurement for loading and off loading. Promass is calibrated on an accredited test rig with hydrocarbons that have the same characteristics as the hydrocarbons that are measured in customers' applications.
| | Reducing time in the harbor
As soon as the tanker enters the jetty, loading or off loading can begin. When finished, the mass measurement is immediately available and the customer can, in turn, immediately produce the "Bill of loading".
| | Reducing the number of claims
Every loading contract includes a paragraph about the difference between onshore figures and tanker figures. Typically, with a difference of more 0.3 %, the buyer can make a claim which can often delay payment. None-stop, continuous operation - no need for reproving on site
| | Integrated advanced diagnostics allow for constant monitoring of the long-term stability of the meter. For this reason, no on site proving station is required. A metering station with Coriolis requires no straight runs and no flow conditioner or strainer, allowing for minimum space requirements and maximum cost savings.
| | Life cycle cost savings
Promass Coriolis mass flow meters operate maintenance free. A flow metering station based on Promass involves absolutely no moving parts, thus no wear and tear and no maintenance required. |
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SCADA visualization of flow calculations