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Foxboro Magnetic Flow Meter Sizing: Selecting Lining Chemistry for Corrosive Industrial Liquids
Quick Answer: For corrosive industrial liquids, select the magnetic flow meter lining before pipe size. PTFE or PFA linings handle strong acids, hot caustic, and many solvent traces. Hard rubber and polyurethane work for dilute acids, seawater, and wastewater below 60 °C. Silver Automation Instruments sizes magnetic flow meters with the correct liner and electrode pair. Send us your fluid name, concentration, temperature in °C, pressure in bar, pipe size in DN, and flow range in m3/h.
Why Lining Chemistry Comes First
Many engineers start a flow meter sizing job with flow rate and line size. That is the wrong order for corrosive industrial liquids. The lining is the first failure point. A wrong rubber lining in 20 percent hydrochloric acid can soften in weeks. We saw this at a paint manufacturer in Vietnam. The stream was ethyl acetate with 2 to 3 percent hydrochloric acid at 45 °C. They replaced rubber with PFA and solved the problem for over one year.
Electromagnetic flow meters need a conductive liquid. Most acids, caustic, and salt solutions exceed the minimum 5 µS/cm. Organic solvents like toluene or ethyl acetate often fall below that limit. In practice, always confirm conductivity before you choose a magmeter for a corrosive stream. Magmeters have no moving parts in the flow stream. That removes one leak path compared with turbine meters and orifice plates. For corrosive service, fewer wetted parts means fewer repair points.
Liner Options and Where They Fit
PTFE is the standard workhorse for strong acids, mixed acids, hot caustic, and aggressive solvents. Use PTFE from DN15 up to DN600 for temperatures up to 120 °C. Do not use PTFE under deep vacuum. PFA is denser than PTFE. It resists permeation and handles vacuum better. Many plants in Southeast Asia choose PFA for hydrochloric acid lines above 30 percent concentration.
Hard rubber suits dilute acids, brine, seawater, and wastewater up to 80 °C. Soft rubber works below 60 °C and handles mild slurries. Polyurethane is for abrasive flows like mining slurry or lime slurry. But polyurethane fails in strong acids and ketones. ETFE fills the middle ground for some acids and solvents. It costs less than PFA but does not cover the full chemical range.
Electrode and Grounding Choices
The liner and electrode must match the same fluid. 316L stainless steel is fine for water and weak chemicals. Hastelloy C handles oxidizing acids, mixed acids, and salt solutions. Tantalum is the standard for hydrochloric acid, dilute sulfuric acid, and nitric acid. Titanium works well in seawater and chlorides. Platinum suits strong oxidizing media and high purity duties.
Grounding rings matter in corrosive service. A plastic liner can insulate the meter body and cause unstable readings. Use tantalum or Hastelloy C grounding rings for aggressive chemicals. Silver Automation Instruments can supply grounding rings matched to the liner and electrode combination.
Common Corrosive Liquid Pairings
For 32 percent hydrochloric acid at 50 °C in a DN50 line, specify a PFA liner with tantalum electrodes and a flow velocity nea
Seawater desalination feed at DN200 does not need PTFE. Hard rubber or polyurethane with 316L or Hastelloy C electrodes is enough. Acid mine drainage at pH 2 with solids calls for polyurethane liner and Hastelloy C electrodes. The solids wear hard rubber quickly. Here is the thing: liner selection changes the inside diameter and flow profile. So sizing and liner chemistry are one step, not two.
We have supplied magnetic flow meters for these applications in the Middle East, Latin America, and Africa. A customer in Chile asked for a replacement magmeter for a copper leach solution. The original unit had a rubber liner that swelled. We supplied a DN150 meter with polyurethane liner and Hastelloy C electrodes. It has been online for 14 months.
How to Send a Sizing Request
Do not send a vague request like we need a flow meter for acid. That slows down the quote. We need the fluid name, concentration, temperature in °C, pressure in bar, pipe size in DN, and flow range in m3/h. Also tell us the output type, for example 4-20 mA HART, and hazardous area zone like ATEX Zone 1 if required.
Contact Silver Automation Instruments by Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610. A sized quote with liner and electrode compatibility check goes back within 24 hours.
FAQ
Q: What lining is best for hydrochloric acid in a magnetic flow meter?
A: PFA or PTFE with tantalum electrodes. For concentrations above 20 percent and temperatures above 40 °C, choose PFA. Send us the concentration and temperature for a specific check.
Q: Can I use a rubber lining for corrosive industrial liquids?
A: Hard rubber and soft rubber work for dilute acids, seawater, and wastewater below 60 to 80 °C. They fail in solvents, strong acids, and high temperature. Check chemical compatibility before you finalize the pipe size.
Q: How does lining selection affect Foxboro magnetic flow meter sizing?
A: Lining selection changes the internal diameter and flow velocity limits. PFA and PTFE liners allow smaller DN sizes for low flows. Rubber and polyurethane often need higher velocity to prevent coating. We size the meter after the liner is selected.
Q: What information do I need to get a magnetic flow meter quote?
A: Fluid name, concentration, temperature in °C, pressure in bar, pipe size in DN, flow range in m3/h, and output type. 4-20 mA HART is common. For hazardous areas, tell us the zone, for example ATEX Zone 1.
Q: Does Silver Automation Instruments provide magnetic flow meters for Foxboro replacements?
A: Yes. Silver Automation Instruments supplies electromagnetic flow meters with PFA, PTFE, ETFE, hard rubber, soft rubber, and polyurethane linings. We can match line size, process connection, and output signal for most industrial installations.
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