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Wafer Cone Flow Meter: Space-Saving Differential Pressure Fluid Instruments
Quick Answer: A wafer cone flow meter is a differential pressure flow meter with a cone shaped restriction that fits between pipe flanges. It saves installation space and needs shorter straight pipe runs than orifice plates. Silver Instruments supplies wafer cone flow meters in sizes from DN15 to DN300 with 4-20 mA HART output and typical accuracy of plus or minus 0.5 percent of rate.
If you engineer process lines in tight skids or pump stations, this meter solves a practical problem. You get stable differential pressure measurement without the long upstream piping that many traditional DP meters require.
What Is a Wafer Cone Flow Meter?
A wafer cone flow meter is a differential pressure device. A cone is fixed in the center of the flow path. The pipe wall has upstream and downstream pressure taps. Flow moves around the cone. The pressure difference between the high side and low side gives the flow rate.
Because the cone shapes the velocity profile, the meter produces a stable signal even in short straight runs. This is the main reason engineers choose the wafer cone meter for crowded skids.
Silver Instruments builds the cone from 316L stainless steel as standard. The wafer body can be 316L stainless steel or carbon steel. You can also specify PTFE or graphite seals depending on the fluid. The meter has no moving parts, which reduces maintenance in steam and dirty gas service.
How Much Straight Pipe Does a Wafer Cone Meter Need?
The wafer body fits between flanges. You do not need a separate flow tube. This reduces weight and length. We have supplied DN50 wafer cone flow meters with total mass under 8 kg for offshore gas lift lines.
Typical straight run is 0 to 3 diameters upstream and 1 to 2 diameters downstream for many installations. That is much shorter than an orifice plate. Most engineers skip this part, but short straight run is what really saves space in a new skid design.
You can install the meter in horizontal, vertical, or inclined pipes. For liquids with solids, vertical upward flow helps keep the cone clean. For gas or steam, horizontal installation is common.
What Are the Technical Parameters and Model Options?
Line sizes: DN15 to DN300. Larger sizes available on request. Pressure ratings: PN16, PN40, ANSI 150, ANSI 300, ANSI 600. Flange standards: ASME B16.5 and EN 1092-1. Process temperature: -50 to 400 °C with standard materials. Accuracy: plus or minus 0.5 percent of rate after calibration. Repeatability: plus or minus 0.1 percent. Turndown: 10 to 1 standard, 15 to 1 on calibrated units.
Output is 4-20 mA HART from the differential pressure transmitter as standard. Pulse and Modbus RTU outputs are optional. You can add a pressure transmitter and a PT100 temperature sensor for mass flow or standard volume flow. For steam, you can get mass flow in kg/h after pressure and temperature compensation. The transmitter housing can be ATEX Zone 1 rated when you need hazardous area certification.
Wetted materials include 316L, PTFE, and graphite. That covers many chemical, water, steam, and fuel gas applications. For seawater desalination, we o
For a DN25 wafer cone flow meter on water, a typical flow range is 0.4 to 8 m3/h. For DN100, a typical range is 8 to 160 m3/h. These ranges change with fluid density and beta ratio. If your fluid viscosity is above 100 cP, tell us because the sizing calculation changes.
What Applications Match a Wafer Cone Flow Meter?
Oil and gas plants use wafer cone flow meters for produced water, fuel gas, flare gas, and natural gas. The cone holds up better than an orifice plate in wet gas or dirty gas because there is no sharp edge to wear.
Water and wastewater plants use them in desalination brine lines, backwash flow, and chemical dosing. A customer in Saudi Arabia ordered DN80 wafer cone flow meters for seawater intake balance. Another project in Australia used DN100 units in a wastewater reuse pump station.
Chemical and paint plants use them for solvent, resin, and additive batching. Last year a paint manufacturer in Vietnam asked us for a DN40 wafer cone flow meter for solvent batching. The pipe was DN40, the solvent flow range was 0.5 to 5 m3/h, and the available straight run was only 2 pipe diameters. The wafer body solved the space issue.
Food and beverage plants use them for steam, hot water, CIP caustic, and chocolate. Marine operators use them for ballast water, fuel oil, and cooling water. In these cases the wafer design reduces weight and flange work.
How to Request a Quote from Silver Instruments
Send us your pressure in bar, temperature in degrees Celsius, pipe size in DN, and flow range. Also tell us the fluid name and viscosity if you have it. We will recommend the cone diameter, body material, seal material, and DP transmitter range.
Contact Silver Automation Instruments. Website: flow-meter.com.au. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526.
FAQ: Wafer Cone Flow Meter Questions
What is the minimum pipe size for a wafer cone flow meter?
Standard sizes start at DN15. For very small lines we can offer DN15 with a cone and a small DP transmitter span.
Can a wafer cone flow meter handle steam?
Yes. Use a 316L cone, graphite seals, and a DP transmitter with a steam manifold. Condensate pots or impulse lines are required. Tell us the steam pressure and temperature so we can check the pressure rating.
How much straight pipe does a wafer cone flow meter need?
It often needs 0 to 3 pipe diameters upstream and 1 to 2 diameters downstream. This depends on the upstream disturbance. We can advise after you send the piping layout.
What is the typical accuracy of a wafer cone flow meter?
Standard accuracy is plus or minus 0.5 percent of rate with a calibrated DP transmitter. Repeatability is plus or minus 0.1 percent. For custody transfer or high accuracy needs, tell us and we can review calibration data.
Can you supply wafer cone flow meters for seawater or brine?
Yes. We supply 316L cone elements with PTFE seals and corrosion resistant transmitter materials. These have been used in desalination plants in Southeast Asia, the Middle East, and Australia.