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Lubricating Oil Flow Meter 4 Inch: Accurate Measurement for Engine, Gear and Hydraulic Oils
Quick Answer: A 4 inch lubricating oil flow meter must handle high viscosities from 20 cP up to 2000 cP and beyond. Oval gear flow meters and Coriolis mass flow meters are the two best technologies for these services. Silver Automation Instruments supplies both types in 4 inch (DN100) with 4-20 mA HART output, ATEX options, and direct pricing from our factory.
When you need to meter lubricating oil in a 4 inch line, you face a set of specific challenges. Lubricating oils change viscosity with temperature. A cold start in a power plant can see the oil at 800 cP. The same oil at operating temperature might drop to 50 cP. Many flow meter types fail in this range. We learned this the hard way. Years ago, a customer in Vietnam tried a turbine meter on a 4 inch lube oil line. The meter gave unstable readings below 100 cP. This happens because turbine meters need a certain Reynolds number. With thick oil, the flow profile gets skewed. Oval gear positive displacement meters do not have this problem.
Our 4 inch oval gear flow meter is built for oils. It uses two precision oval rotors that trap a known volume of fluid per rotation. You get direct volumetric measurement. The meter body is cast iron or stainless steel. Bearings are available in carbon graphite or tungsten carbide for dirty oil. We have shipped these meters to a diesel genset factory in Nigeria. They measure SAE 40 engine oil at 85°C and 10 bar pressure. The flow range for the 4 inch model goes from 2 m³/h up to 40 m³/h. Accuracy is ±0.5% of reading. Output can be a pulse signal or a 4-20 mA loop with HART. Add a local totalizer and you have a complete measuring point.
Here’s the thing about oval gear meters. They like clean oil. If your lubricating oil carries metal shavings or sludge, you will need an upstream strainer. Coriolis meters do not care about dirt. Our 4 inch Coriolis mass flow meter measures mass flow directly. It also gives density and temperature from the same sensor. This meter handles viscosity changes without recalibration. The wetted parts are 316L stainless steel. We had a customer in Chile measure steam turbine oil with a 4 inch Coriolis meter at 120°C and 22 bar. The meter has worked for three years without drift. The downside is cost. A 4 inch Coriolis meter costs about three times more than an oval gear meter. But for critical machinery, the extra data and reliability pay back. Both meters can be certified for ATEX Zone 1 or IECEx for gas and dust if your site requires it.
Technical details matter in 4 inch installations. The process connection is typically ANSI 150# RF flange or EN 1092-1 PN16. Spool length for the oval gear me
Cost and lead time are practical concerns. A 4 inch oval gear lubricating oil flow meter from Silver Instruments costs less than you might expect for an OEM supplier. We manufacture in China with speed. Typical lead time for a standard 4 inch oval gear meter is 3 weeks. A Coriolis meter takes 4 to 5 weeks. We ship to Southeast Asia, Middle East, Africa, and Latin America every week. Last month a lubricant blending plant in Saudi Arabia ordered ten 4 inch oval gear meters for different oil grades. They requested stainless steel bodies and Pt100 temperature output. We delivered in 25 days.
Now for the questions we answer every day in our inbox.
FAQ
What flow meter type is best for 4 inch lubricating oil with high viscosity? Oval gear positive displacement meters work well from 20 cP to 2000 cP. If your oil viscosity exceeds 2000 cP or you need mass measurement, choose a Coriolis meter. We can help you decide based on your operating data.
Can I get a 4 inch flow meter for high temperature lubricating oil? Yes. Our oval gear meters can be built with high temperature sensors up to 150°C. Our standard Coriolis meter handles 150°C. For temperatures above 150°C, contact us with exact conditions.
Do these meters need a straight pipe run? The oval gear meter needs no straight run. The Coriolis meter benefits from 5D upstream and 2D downstream. We can include a straightening vane if your piping is tight.
What output signals do these 4 inch meters provide? Standard outputs are 4-20 mA with HART, frequency/pulse, and RS485 Modbus. You can also add a local digital display. Tell us your control system and we will match the signal.
How do I get a price and quote for a 4 inch lubricating oil flow meter? Send us your pressure (bar), temperature (°C), pipe size (DN), flow range, and oil type. We will return a detailed proposal with a data sheet within 24 hours.
Most engineers skip the fancy brochures and go straight for a technical offer. So if you have a 4 inch lubricating oil line, send us your real parameters. We size the meter for your range. You get a fixed price, a delivery date, and a drawing for the flange. That is how we work at Silver Automation Instruments.
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