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Segmental Wedge Flow Meter: Differential Pressure Probes for Sticky Slurries
Quick Answer: A segmental wedge flow meter is a differential pressure flow meter with a V-shaped wedge restriction. It measures sticky slurries, sludge, paper pulp, and heavy oil without plugging. Silver Automation Instruments supplies the SI-WF series wedge flow meter from DN25 to DN400 for pressures to 40 bar and temperatures to 200 °C.
How a Wedge Flow Meter Works
A wedge flow meter belongs to the differential pressure family. It uses a wedge-shaped obstruction placed in the pipe. Upstream and downstream pressure taps connect to a differential pressure transmitter. The transmitter converts the pressure drop into a flow signal. The signal is typically 4-20 mA HART. The wedge shape creates a self-cleaning path. Solid particles do not collect in front of the wedge the way they do with an orifice plate.
Why Wedge Meters Work for Sticky Slurries
Orifice plates fail in sticky media. Paper stock, lime mud, tomato paste, and heavy crude leave deposits on sharp edges. Those deposits change the discharge coefficient. The measurement drifts. A segmental wedge flow meter has a smooth wedge angle. Flow sweeps the wedge face. No sharp corner holds the solids. That is the main reason plants choose wedge meters for slurries.
We have seen this on customer sites many times. A paint manufacturer in Vietnam replaced an orifice plate after three weeks of fouling. The media was latex paint with a viscosity around 1200 cP. After installing a PTFE lined wedge meter, the plant ran nine months without cleaning. The meter accuracy stayed within 1 percent of rate.
Typical Applications and Process Conditions
A segmental wedge flow meter fits many industries. Use it for pulp stock in paper mills. Use it for sludge in wastewater plants. It works for crude oil with sand in refineries. It also handles molasses, starch slurry, and drilling mud. The wedge element works with small amounts of entrained gas. It handles Reynolds numbers as low as 500. That matters for viscous media.
Common process conditions for the SI-WF series:
Pipe sizes DN25 to DN400
Process pressure up to 40 bar, higher on request
Process temperature from -20 °C to 200 °C
Viscosity from 1 cP to above 1500 cP
Turndown 10:1
Accuracy 1 percent of rate after calibration
Pairing the Wedge Element with a DP Transmitter
The wedge element alone does not give a flow reading. You need a differential pressure transmitter. Silver Automation Instruments pairs the wedge meter with a 4-20 mA HART DP transmitter. For sticky or hot media, use remote diaphragm seals. A remote seal transmitter keeps the impulse lines clean. It also protects the transmitter from solids and high temperature. For hazardous areas, we supply ATEX Zone 1 or Zone 2 approvals. For better mass flow, a three-wire PT100 can be added for temperature compensation.
Flow calculation follows the DP flow formula. The wedge meter coefficient depends on wedge ratio and pipe size. We provide a calibration certificate with each meter. The certificate shows the flow coefficient and the calculated DP range for your flow range.
Installation and Maintenance
Install the wedge flow meter with enough straight run. For most installations, 10 pipe diameters upstream and 5 downstream work well. If you have a control valve or elbow close by, extend the upstream run to 15 or 20 diameters. Keep the pressure taps on the side for liquid slurries. That stops solids from settling in
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In practice, most plants inspect the wedge face once a year. The wedge element has no moving parts. For abrasive slurries, specify a hardened wedge material or a ceramic coating. The PTFE lined version helps with sticky media that tend to coat metal surfaces. If the wedge does wear, you can replace the element without cutting the pipe. The transmitter can be zero trimmed in place.
Customer Site Notes
Last year a customer in Indonesia asked us for a flow meter for palm oil sludge. The fluid had 45 percent solids and a viscosity of 800 cP. A magnetic flow meter would not work because the solids were not conductive enough. A Coriolis meter was quoted at three times the budget. We supplied a segmental wedge flow meter DN80 with remote seals. The meter has been in service for eight months. The reading is stable. The customer later ordered two more units for a second line.
A wastewater plant in Queensland, Australia used a wedge meter for thickened sludge. The plant manager told us the wedge meter is easier to clean than an electromagnetic flow meter. The sensor has no electrodes to coat. That is a useful feature in sludge service.
How to Request a Quote
Do not send a general inquiry if you want a fast quote. Send us the process data. We need the media type, viscosity in cP, pipe size DN, pressure in bar, temperature in °C, and flow range. We also need the pipe material and flange standard. For example, send us this data: tomato paste, 900 cP, DN100, 6 bar, 90 °C, 20 to 80 m3/h, 316L, DIN PN16. We will reply with a budget price and a recommended model within 24 hours.
Contact Silver Automation Instruments for a segmental wedge flow meter quote.
Tel: +86-25-68650347
Whatsapp: +86-25-52155837
WeChat: +86 15365082610
Our team covers Southeast Asia, Oceania, Latin America, Africa, and the Middle East. We ship from our factory to your site.
FAQ: Five Key Questions
What is a segmental wedge flow meter?
A segmental wedge flow meter is a differential pressure flow meter. It uses a wedge-shaped restriction to create a pressure drop. A DP transmitter converts that pressure drop into flow. It works well in slurries and high viscosity fluids.
Why does a wedge meter handle sticky slurries better than an orifice plate?
The wedge has a smooth V-shaped face. Sticky solids do not collect on a sharp edge. Flow continuously sweeps the wedge face. The meter stays clean and keeps its calibration much longer.
What pipe sizes and process conditions does a wedge flow meter support?
Standard sizes are DN25 to DN400. We can do larger sizes on request. Pressure ratings go up to 40 bar. Temperature range is -20 °C to 200 °C. Viscosity can exceed 1500 cP. This covers most slurry and heavy oil applications.
Can I use a wedge flow meter in hazardous areas?
Yes. The DP transmitter can be supplied with ATEX Zone 1 or Zone 2 certification. The wedge element is passive and does not require electrical approval. For high temperature or corrosive media we use remote diaphragm seals.
How much does a segmental wedge flow meter cost?
Price depends on pipe size, material, transmitter type, and seals. A DN50 316L wedge meter with a standard DP transmitter often falls in the range of 1,500 to 2,800 USD. A DN200 PTFE lined unit with remote seals will cost more. Send us your full process data and we will provide a firm quote.