| Applies when | ferric chloride, ferric sulfate, FeCl3, Fe2(SO4)3, coagulant |
|---|---|
| Avoid | FRP, fiberglass (Tank) |
| Recommend instead | Poly Processing XLPE tanks, IMFO / SAFE-Tank systems (Tank) |
| Rationale | Poly Processing's own literature (chemical-storage ferrics page, blog, and Tank_Specs.pdf) explicitly warns FRP is NOT suitable for ferric chloride — it acts as an etching medium on FRP resin — a real differentiator against generic FRP marketing that treats it as a universal corrosion-resistant material. Published concentration limits: Ferric Chloride <=50%, Ferric Sulfate <=60% (also lists Ferrous Chloride and Ferrous Sulfate as compatible at similar limits). Recommended system: XLPE resin, specific gravity 1.65 rating, PVC fittings, EPDM gaskets, titanium bolts, IMFO (true-bottom drain handles settling/sludge), heat pads/insulation (ferrics often delivered at elevated temperature, testing tank expansion/contraction), mixing system (prevents separation), scrubber if vented outdoors (ferric fumes can defoliate surrounding vegetation). On the pump/metering side, Grundfos's own SMART Digital / DDA chemical-resistance table lists ferric chloride and ferric sulfate as dosable at SATURATED concentration with PP dosing heads and FKM (Viton) gaskets, including a 'Slow Mode' specifically for high-viscosity coagulants. March Pump's own application page names 13 specific mag-drive sealless centrifugal models rated for ferric chloride transfer/recirculation duty (PP for smaller models, Kynar/PVDF and Ryton for larger) — a distinct equipment category (transfer, not metering) from the Grundfos/ProMinent dosing-pump slot. |
| Confidence | confirmed |
| Source | data/vendor-sources/poly-processing-chemical-storage.md |
This is a general engineering rule derived from real field/case-study evidence, not a substitute for a project-specific specification review — confirm against your exact process conditions before ordering equipment.
Reviewed by James Riggins, Founder, LibertyCES — 30+ years specifying industrial fluid-handling equipment for the exact failure modes this rule addresses. Request a free spec review →
All engineering rules → · Download full ruleset (JSON) →
ferric chloride, ferric sulfate, FeCl3, Fe2(SO4)3, coagulant
Poly Processing's own literature (chemical-storage ferrics page, blog, and Tank_Specs.pdf) explicitly warns FRP is NOT suitable for ferric chloride — it acts as an etching medium on FRP resin — a real differentiator against generic FRP marketing that treats it as a universal corrosion-resistant material. Published concentration limits: Ferric Chloride <=50%, Ferric Sulfate <=60% (also lists Ferrous Chloride and Ferrous Sulfate as compatible at similar limits). Recommended system: XLPE resin, specific gravity 1.65 rating, PVC fittings, EPDM gaskets, titanium bolts, IMFO (true-bottom drain handles settling/sludge), heat pads/insulation (ferrics often delivered at elevated temperature, testing tank expansion/contraction), mixing system (prevents separation), scrubber if vented outdoors (ferric fumes can defoliate surrounding vegetation). On the pump/metering side, Grundfos's own SMART Digital / DDA chemical-resistance table lists ferric chloride and ferric sulfate as dosable at SATURATED concentration with PP dosing heads and FKM (Viton) gaskets, including a 'Slow Mode' specifically for high-viscosity coagulants. March Pump's own application page names 13 specific mag-drive sealless centrifugal models rated for ferric chloride transfer/recirculation duty (PP for smaller models, Kynar/PVDF and Ryton for larger) — a distinct equipment category (transfer, not metering) from the Grundfos/ProMinent dosing-pump slot.
Poly Processing XLPE tanks, IMFO / SAFE-Tank systems (Tank)
Source: Liberty Chemical Equipment & Supply, Inc. (LibertyCES) — engineering data compiled and reviewed by James Riggins, Founder, LibertyCES, from real vendor and field-verified sources. For a free spec review, call James at (559) 395-5500 or email [email protected] / [email protected]. Website: libertyces.com.