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2 Inch Inline Flow Meter: Standard Industrial Two-Inch Pipe Fluid Sizers
Quick Answer: A 2 inch inline flow meter installs directly into a DN50 process line and measures liquid, gas, or steam without external bypass piping. For conductive liquids such as water, wastewater, and seawater, an electromagnetic flow meter is the standard 2 inch choice. For oils, solvents, steam, or low conductivity fluids, select a Coriolis mass flow meter, vortex flow meter, or oval gear flow meter based on flow range, pressure, temperature, and viscosity. Send Silver Automation Instruments your fluid, pipe size in DN, flow range, pressure in bar, and temperature in °C for a specific model and price.
Silver Automation Instruments supplies 2 inch inline flow meters to industrial users and distributors in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. A two-inch meter is common in water treatment skids, chemical batching, fuel transfer, food and beverage lines, and utility air systems. The pipe callout is DN50 in metric terms. The meter body generally matches flanges, threads, or wafer installation used in ASME B16.5 Class 150 or DIN PN16 lines.
Why 2 Inch Pipe Size Limits Technology Choices
Physical fit. A 2 inch inline flow meter has a nominal bore of 50 mm. The actual inside diameter depends on the meter type. An electromagnetic meter has a full bore design and keeps pressure loss low. An oval gear meter has a reduced chamber. A vortex meter has a bluff body in the flow path. These differences change pressure drop and accuracy at low flow.
Here is the thing. The fluid decides the shortlist. Water and wastewater with conductivity above 5 µS/cm work well with an electromagnetic meter. Diesel and lubricating oils do not. That is why a positive displacement oval gear meter or a Coriolis meter is used. Gas and steam need a vortex or thermal mass meter. Most engineers skip this part and choose by fluid compatibility first, then flow range.
Electromagnetic Flow Meter for 2 Inch Water and Wastewater Lines
Recommended configuration. Silver Instruments offers a DN50 inline electromagnetic flow meter with PTFE liner, 316L electrodes, 4-20 mA HART output, and IP67 housing. Accuracy is typically plus or minus 0.5 percent of reading. The flow range for a 2 inch model is roughly 0.8 to 80 m³/h for water at 25 °C. It has no moving parts and handles clean water, raw water, sludge, and seawater.
We have seen this on customer sites many times. A water utility in the Philippines replaced mechanical propeller meters with Silver Instruments 2 inch electromagnetic meters to reduce maintenance. The installation was in a DN50 PVC line feeding a small distribution zone. The meter gave stable readings at 4 to 20 mA HART and reduced calibration calls. For seawater desalination plants, the PTFE liner and 316L electrodes resist corrosion. Flow velocity should stay between 0.3 and 10 m/s for reliable measurement.
Coriolis Mass Flow Meter for Two-Inch Chemical and Food Lines
Mass flow, density, and temperature in one device. A 2 inch Coriolis inline flow meter can measure up to about 30,000 kg/h depending on fluid density and pressure drop. It handles solvents, syrups, and pastes. It measures mass flow directly instead of volume, so density changes do not hurt accuracy. Accuracy is usually plus or minus 0.2 percent of rate for liquid mass flow.
Last year a customer in Vietnam asked us for a 2 inch Coriolis meter for a batch mixing process. They handled solvent, resin, and water in the same line. The fluid viscosity varied from 1 to 50 cP. The Coriolis meter gave the control system a direct kg/h signal and density value. That removed the need for separate temperature compensation. Because the meter has no straight run requirement, it fit into a tight chemical skid. Silver Instruments supplies this meter with 4-20 mA HART, pulse, and Modbus output options.
Vortex Flow Meter for 2 Inch Steam and Gas Pipes
Steam and compressed air. A DN50 vortex flow meter fits saturated steam, superheated steam, compressed air, and natural gas lines. For 2 inch pipes, a typical flow range is 15 to 150 m³/h for compressed air at 7 bar. For steam at 8 bar, a DN50 meter often covers 70 to 200 kg/h depending on density and temperature. The meter uses a bluff body and sensor to measure vortex frequency.
Vortex meters work well in oil and gas utility systems. A distributor in S
Oval Gear Flow Meter for 2 Inch Oils and Fuels
Positive displacement for viscous fluid. A 2 inch oval gear inline flow meter measures diesel, fuel oil, lubricants, and other non conductive liquids. It works at viscosities from 1 to 1000 cP. The flow range for a DN50 oval gear meter is often 2 to 100 liters per minute depending on viscosity. It gives a pulse output for local batch control or remote totalizing.
These meters are common in fuel transfer and marine service. We supplied a 2 inch oval gear meter to a marine service company in Australia for diesel transfer from a storage tank to workboats. The meter included a mechanical register and a pulse output. Because it had no need for straight pipe, it fit directly after a pump skid. For lower flow rates, the oval gear design holds accuracy better than a turbine meter.
Thermal Mass and Ultrasonic Meters for Special Two-Inch Applications
Dry gas and biogas. A 2 inch inline thermal mass flow meter measures mass flow of compressed air, nitrogen, or biogas at low velocity. It works in lines where a vortex meter may lose signal. An inline ultrasonic flow meter for 2 inch pipes can handle water and some chemicals without wetted moving parts. Silver Instruments selects thermal mass or ultrasonic only when the process conditions make the main meter types unsuitable.
Key Data You Should Send Before Buying a 2 Inch Inline Flow Meter
Fluid, flow range, pressure, temperature, and output. Give us the fluid name, conductivity in µS/cm for water, viscosity in cP for oils, flow range in m³/h or kg/h, line pressure in bar, and operating temperature in °C. Also tell us if the area is hazardous and needs ATEX Zone 1 or Zone 2. The more data you send, the faster we match a standard model.
For a typical 2 inch electromagnetic flow meter on a water line, mention the expected minimum and maximum flow. A meter sized for 40 m³/h may not read well at 0.5 m³/h. For steam, give pressure and temperature because density changes the mass flow. For fuel oil, give viscosity at operating temperature. This is the part that reduces quoting mistakes and site startup delays.
FAQ: 2 Inch Inline Flow Meter
What is the actual inside diameter of a 2 inch inline flow meter? The nominal pipe size is DN50. The actual bore can be 50 mm for full bore electromagnetic and Coriolis meters. Oval gear and vortex meters may have a smaller passage. Always confirm pressure drop with the vendor.
Can I measure deionized water with a 2 inch electromagnetic flow meter? Usually no. Standard electromagnetic meters need liquid conductivity above 5 µS/cm. Deionized water below this level may give unstable readings. Use a Coriolis mass flow meter or an ultrasonic meter for low conductivity water.
What is the typical 2 inch vortex flow range for steam? At 8 bar saturated steam, a DN50 vortex meter often covers about 70 to 200 kg/h. At lower pressure the mass flow range drops. At higher pressure the range increases. Provide steam pressure and temperature for sizing.
Does a 2 inch Coriolis meter need straight pipe? No. Coriolis mass flow meters do not need upstream or downstream straight runs. They fit into cramped skids and batch systems. Electromagnetic and vortex meters generally need some straight pipe, often 5D upstream and 3D downstream, depending on the model.
What output options does Silver Instruments supply for 2 inch flow meters? Standard output is 4-20 mA HART. Pulse, RS485 Modbus, and local display are available. We also supply IP67 or ATEX Zone 1 housings for hazardous areas. Tell us your control system input before ordering.
Get a Quote for a 2 Inch Inline Flow Meter
Request a fixed price. Send us your fluid, pipe size in DN, flow range, pressure in bar, temperature in °C, and any hazardous area requirement. Silver Automation Instruments will reply with a recommended meter type, datasheet, and quotation. Contact Tel: +86-25-68650347, WhatsApp: +86-25-52155837, WeChat: +86 15365082610. Or visit flow-meter.com.au for product details.