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Ferric Chloride (FeCl₃) Dosing Pump: Chloride Corrosion & ETP Coagulant Solutions
Ferric chloride (FeCl₃) is one of the most aggressive pitting agents encountered in water treatment and ETP plants due to high ferric ion oxidation potential coupled with concentrated chlorides. Dosing pumps must be constructed from solid machined PVDF, virgin PTFE, or Hastelloy C-276, completely excluding standard stainless steels which suffer through-wall pitting within days.
Corrosion & Dosing Dynamics: Ferric Chloride (FeCl₃)
Ferric chloride solution (38% to 42% commercial coagulant) is an acidic, heavy chemical (specific gravity 1.40–1.45). The ferric ion (Fe³⁺) is a potent oxidizer while chloride ions (Cl⁻) aggressively attack passive oxide layers on metals. Standard SS 304, SS 316, and even Duplex 2205 exhibit rapid pitting and crevice corrosion. Fluoropolymers (PVDF, PTFE) and high-molybdenum nickel alloys (Hastelloy C-276) provide total resistance.
Recommended Engineering Specifications for Ferric Chloride (FeCl₃)
| Parameter | JEW Factory Recommendation |
|---|---|
| Recommended Pump Type | Glandless Mechanically / Hydraulically Actuated Diaphragm Metering Pump |
| Liquid End Material | Solid Machined PVDF (Kynar) / Virgin PTFE / Hastelloy C-276 |
| Diaphragm Construction | Chemically inert multi-layer Virgin PTFE (Teflon) |
| Check Valve Balls & Seats | Pure Ceramic (Al₂O₃) / Pure PTFE with PVDF knife-edge seats |
| Gland Packing | 100% Glandless Hermetic Enclosure (Zero dynamic seal leakage) |
| Specific Gravity Capacity | Heavy-duty gear transmission rated for fluid density up to 1.50 g/cm³ |
| Motor Sizing | Upgraded motor horsepower to easily overcome high fluid density |
| Dosing Linearity | ±1% volumetric repeatability conforming to API 675 standards |
Piping, Priming & Installation Best Practices
- Heavy Fluid Sizing: Because ferric chloride has a specific gravity of ~1.42, motor horsepower and suction acceleration head calculations must be factored accordingly.
- Zero Metallic Wetted Parts: Never use metallic piping, fittings, or valves in ferric chloride feed lines; specify solid schedule 80 PVC, PVDF, or PTFE-lined pipe.
- Pulsation Dampening: To protect rigid plastic piping from reciprocating pressure spikes, install a PVDF-bodied, PTFE-bladder pulsation dampener directly on the pump discharge.
- Calibration Column Verification: Include an acrylic or borosilicate glass calibration cylinder to accurately verify coagulant flow rates during jar testing optimization.
Frequently Asked Engineering Questions
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Jagdish Engineering Works manufactures custom chemical dosing pumps and turnkey skids with 55+ years heritage. Delivered with Mill Test Certificates & Hydrostatic Test Logs.
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Jagdish Engineering Works, Mumbai – manufacturer of plunger and diaphragm metering pumps and pressure relief valves since 1969. Our engineers design, test and repair dosing pumps for water treatment, chemical, refinery, fertilizer, sugar and paper plants.
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