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Crude Oil Flow Meter DN200 Main Trunkline Custody Transfer
Quick Answer: For a DN200 main trunkline handling custody transfer of crude oil, a Coriolis mass flow meter is the strongest choice. It delivers direct mass measurement at ±0.1% of rate, needs no straight pipe runs, and holds accuracy even when oil density and viscosity change. Silver Instruments supplies the SICOR‑DN200 dual‑tube Coriolis meter built to OIML R117 standards and can have a quote ready once you share your pressure, temperature and flow range.
Why DN200 Sizing Decides the Whole Metering Skid
An 8‑inch line (DN200) on a crude trunkline moves a lot of oil. Typical flowrates sit between 120 m³/h and 400 m³/h at line pressures from 20 bar to 70 bar. Selecting a flow meter below DN200 creates a bottleneck and a high pressure drop that terminal operators will not accept. Oversizing beyond DN200 costs you extra flange work and reduces low‑end sensitivity. Most engineers skip this part and later deal with flow‑induced vibration on the skid. We have seen this on customer sites many times.
Which Flow Technology Works Best for Custody Transfer
Multipath ultrasonic meters are common in large trunks but they need long straight pipe and stable flow profiles. Crude headers in a terminal rarely give you 20D upstream. Turbine meters drift when waxy or asphaltenic crude leaves deposits on the rotor. Positive displacement meters handle high viscosity well but the moving parts mean planned shutdowns. That is why a Coriolis meter has become the preferred primary meter for DN200 custody transfer. The SICOR‑DN200 measures mass directly, has no internal moving parts, and tolerates entrained solids or gas slugs up to a few percent volume. Here is the thing: you also eliminate the need for a separate densitometer because the meter outputs density at line conditions.
Coriolis Meter Specifications for DN200 Crude Service
Silver Instruments builds the SICOR‑DN200 with a 316L stainless steel dual‑tube construction. The full‑scale mass flow is 400 000 kg/h, and it holds ±0.10% accuracy of rate above 10% of max flow. Repeatability stays within ±0.05%. The flange rating is ASME B16.5 Class 600, and the body withstands process temperatures from –40 °C to 150 °C. For hazardous areas the meter carries ATEX Zone 1 certification (Ex d ia IIC T4) and SIL 2 readiness. Signal outputs include 4‑20 mA HART, a pulse output for the prover loop, and Modbus RTU. The converter stores the last 200 alarm events and the audit trail required for metering integrity. Because custody transfer in many countries follows API MPMS Chapter 5.8 or OIML R117, the meter has passed type evaluation under OIML R117 for mass metering, which simplifies local weights‑and‑measures approval in markets like Nigeria, Colombia, and Vietnam.
One Field Case from a Southea
In 2023 a crude loading terminal in Malaysia replaced four 8‑inch turbine meters with two SICOR‑DN200 Coriolis meters. The old meters saw repeatability drift after heavy naphthenic crude batches and needed weekly flushing. The new meters delivered a factor K curve that stayed flat across the entire temperature range. Measurement uncertainty shrank by 0.15%, and the terminal operator calculated that they saved roughly 18 barrels per shipment. The project also removed the upstream straighteners and the strainers, which cut skid length by almost three metres. That freed enough deck space for a second sampling loop.
How to Get a Quote Without Guessing
Do not send an email that just says “DN200 crude flow meter price”. That starts a long back‑and‑forth. Give us four data points and we can return a complete proposal within one business day. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. If you know the crude density and maximum viscosity, add those too. We will confirm the flange class, wetted material, transmitter option, and the exact model number in the quote. This is also the moment to ask for a QAL1 certificate, an IP66 weather cover, or an extended offline calibration. Most engineers ask for these after the order is placed and then face delays. Let us fix it before the PO is issued.
FAQ
Can the SICOR‑DN200 handle waxy crude with a viscosity above 100 cP?
Yes, it measures liquids up to 500 cP without any correction factor. Above 500 cP we add a slight pressure drop compensation in the converter, which the factory can pre‑configure using your viscosity curve.
Is the meter approved for legal custody transfer in export terminals?
The meter is type‑approved under OIML R117 for mass metering. We provide the certificate of conformity, and in some countries we can also pre‑fill the national pattern approval paperwork for you.
What is the required warm‑up time and zero check interval?
The meter needs 12 minutes to stabilise. We recommend a zero verification once per week during normal operations and a full zero calibration after any major pigging run.
Do you supply the mating flanges and the short spool pieces?
We can include the upstream and downstream spool pipes in 316L, complete with purge ports and thermometer wells. When you request the quote, tell us the pipe schedule and we will match the fab drawings.
How does Silver Instruments support field commissioning in remote locations?
Our service engineers travel to sites in the Middle East, Africa, and Southeast Asia. A typical three‑day commissioning package covers factory fingerprint verification, a wet flow test if the prover is on site, and meter software configuration tied to your SCADA tags.