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Crude Oil Flow Meter DN80: Sizing for Gathering Station Pipelines
Quick Answer
When you size a flow meter for a crude oil gathering station, match the meter directly to the existing pipe diameter. A DN80 Coriolis mass flow meter from Silver Automation Instruments fits 3-inch (DN80) lines used in many gathering networks. It handles flow rates from 10 to 120 m³/h for medium crude, delivers custody-transfer accuracy, and removes the need for reducers. You get mass flow, density, and diagnostics in one device without extra straight pipe runs.
Why DN80 Matters for Crude Oil Gathering Lines
In onshore and offshore stations from Oman to Sumatra, the main crude transfer headers often run at DN80 (3 inches). Pipe size selection balances flow velocity, pressure drop, and wear from sand or water slugs. Typical crude flow in a DN80 gathering line sits between 40 and 100 m³/h. A smaller pipe drives velocity too high and causes erosion inside bends. A larger pipe lets water and solids settle at low flow. When you install a flow meter with the same DN80 size, you skip expensive adapter flanges. You keep the pipe layout simple and avoid extra leak paths. We have seen this approach work well in fields across Nigeria, Indonesia, and Kuwait.
Matching Flow Meter Capacity to Pipeline Size
Choosing a flow meter with the same nominal diameter as your gathering line is the most reliable method. A Silver Instruments DN80 Coriolis meter measures up to 150 m³/h for crude oil with a density near 900 kg/m³. The turndown ratio can reach 20:1, so you read low flows during startup, pigging, or well swap operations. The meter body has no moving parts and needs no strainer. You get mass flow, product density, and temperature from a single sensor head. This matters because crude quality shifts between wells. The live density value gives you an instant API gravity check. Operators use that trend to track blend consistency and spot water breakthroughs early.
Pressure Drop and Viscosity Considerations
Crude oil viscosity changes a lot from field to field. Light crude might show 5 cP at 40 °C. Heavy crude from a steamflood gathering system can reach 200 cP or more. A Coriolis meter adds some pressure loss because of the tube geometry and internal flow split. For a DN80 sensor at 100 m³/h with 20 cP crude, the pressure drop stays below 0.3 bar. We calculate this for every project using your real fluid data. In most medium viscosity services the DN80 size works without throttling. If your crude stays above 100 cP for long periods we may propose DN100 to keep pressure loss low. But most gathering stations with API above 22 degrees run the DN80 meter without issues.
Field Example: Southeast _600x400.jpg)
A customer on Sumatra island processes 5000 barrels per day of medium crude across several well pads. Their main gathering line is 3-inch Schedule 40 pipe, operating at 25 bar and 55 °C. They installed a Silver Automation Instruments DN80 Coriolis mass flow meter with ANSI 600 RF flanges, 316L stainless steel wetted parts, and an integral transmitter with 4-20 mA HART output. The old turbine meter had bearing wear from fine sand and gave erratic readings after six months. After the switch, they get stable mass flow data at ±0.15% liquid accuracy. They use the live density reading to spot changes in well output day by day. The meter has run two years with no recalibration and no filter cleaning.
What to Send Us for a Quick Quote
Do not send a general inquiry. Give us your crude oil parameters and pipe details. We will reply with a specific model number, price indication, and delivery time. Include these four items: operating pressure in bar (or psi), temperature range in °C, pipe size (DN) and schedule, and minimum to maximum flow rate in m³/h or barrels per day. If you know your crude viscosity, send it. If not, we can work from density and a rough API number. Email your data to [email protected] with the subject “DN80 crude oil meter gathering station”.
FAQ
Can a DN80 Coriolis meter handle crude oil with viscosity above 100 cP? Yes. The meter holds high accuracy up to about 200 cP. Beyond that pressure drop rises, so we run a sizing check with your flow data. In some cases we recommend moving to DN100 for heavy crude gathering lines.
What is the typical flow range for a DN80 crude oil flow meter? You can measure from 5 m³/h up to 150 m³/h for standard crude around 900 kg/m³ density. The exact span depends on viscosity and line pressure. We set the transmitter range to match your operating window.
Do I need straight pipe runs upstream of the meter? No. Coriolis meters are immune to flow profile distortion. You can install the DN80 meter right after an elbow, tee, or control valve. This saves a lot of space in crowded gathering station piping.
How do I handle gas slugs in the crude line? The meter detects two-phase flow and can trigger a configurable alarm. We recommend a simple gas breaker upstream if the gas void fraction goes above 5 percent. The transmitter will flag density drops so operators see the event immediately.
What pressure ratings are available for a DN80 meter? Standard ratings cover ANSI 150, 300, and 600. We also supply PN100 and PN160 flanges for high pressure gathering networks. Material choices include 316L stainless steel and duplex for corrosive fields with CO2 or H2S.
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