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Crude Oil Flow Meter 2 Inch Field Desalting Loop Metrics
Quick Answer
For a 2 inch crude oil desalting loop, a Coriolis mass flow meter with DN50 flanges is your most reliable choice. It measures mass flow, density, and temperature in a single device. You get direct net oil and water cut data without needing density compensation. Silver Automation Instruments supplies the SILVER-CMF series with ATEX Zone 1 certification and 4-20 mA HART output.
Why Mass Flow Beats Volume Flow in Desalting
Crude oil electro-desalting mixes wash water with the oil stream to remove salts. The mixed fluid density changes second by second. A turbine or vortex meter measures volume flow. You then need separate density input to calculate mass. A Coriolis meter skips this step. It directly outputs mass flow in kg/h and density in kg/m³. A refinery in Vietnam saw a 3 percent drop in corrosion related shutdowns after installing our DN50 Coriolis meter on their 2 inch desalting loop. They now monitor actual crude flow rate before and after the mixing valve.
Key Metrics You Get from a 2 Inch Field Desalting Loop Meter
Here are the numbers our customers ask for most. Mass flow range: 0 to 32,000 kg/h on a 2 inch line with crude of 800 to 950 kg/m³ density. Density accuracy: plus minus 0.5 kg/m³. This lets you spot poor mixing or emulsion issues early. Temperature: integrated PT100 sensor, range minus 50 to 200 degrees Celsius. Pressure rating: up to ANSI 1500 hash approximately 250 bar. Viscosity handled: up to 500 cP without meter derating. Output: two 4-20 mA loops for mass flow and density, plus HART 7. Digital communication helps when your desalter control room is 300 meters away.
Silver Automation Instruments End to End Solution
We ship the SILVER-CMF-DN50 flow meter pre-calibrated for crude oil with a 2 inch 316L stainless steel flow tube. Sensors are Hastelloy C22 for erosion resistance in produced water service. The transmitter mounts locally with a process display showing kg/h, totalized mass, and density. Certification includes ATEX Ex db IIB T4 and IECEx, so you can install right next to the pre-heater without additional purging. A refinery customer in Thailand replaced an old plate flow computer with our meter and one cable. They cut three potential leak paths
Installation Tip: Skip the Long Straight Run
Most engineers skip this part. Coriolis meters need zero straight run. You can place the DN50 meter directly after a 90 degree elbow or a mixing tee on your desalting skid. This saves almost 1.5 meters of piping space compared to an orifice plate setup. Just make sure you purge the meter body of air during startup. Keep the back pressure above 2 bar to avoid flashing if your crude temperature is 130 degrees Celsius or higher.
FAQ
Can a Coriolis meter handle the 2 inch desalting loop where water cut jumps from 5 percent to 15 percent? Yes. The meter directly measures the flowing density. It automatically compensates for any water cut change, giving you true net oil mass flow. No external water cut analyzer needed.
What flow range can I expect on a 2 inch crude oil line? Typical range is 2,000 to 35,000 kg/h for crude oil with density around 870 kg/m³. Lower limit around 600 kg/h with 0.15 percent accuracy. Our SILVER-CMF-DN50 handles over range up to 40,000 kg/h without damage.
Do I absolutely need ATEX for a field desalting loop? In most refineries in the Middle East and Southeast Asia, yes. The area around the desalter is classified Zone 1. Our meter comes with Ex d housing and suitable cable glands. Send us your zone classification and we match the certification.
Why not just use a vortex meter with pressure and temperature compensation? In practice, a vortex meter on a crude desalting line can clog with wax or asphaltenes at lower temperatures. Coriolis meters have no moving parts in the flow path apart from the vibrating tubes, which are self-cleaning at higher velocities. Also, density measurement is direct, not calculated.
How do I request a quote for a 2 inch crude oil desalting flow meter? Email us your process data: crude oil density range, operating temperature, pressure, pipe schedule, and your target flow range in kg/h or tons per day. We will send you a technical proposal with the SILVER-CMF datasheet and pricing within 48 hours. See our Coriolis flow meter page for crude applications.
Silver Instruments provides in house calibration against water and heated oil. Every DN50 meter comes with a 12-month warranty and remote startup support via video call.
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