Drainage Systems
FRP drainage systems are prefabricated channels, trench drains, and catch basins manufactured from fiberglass-reinforced polymer, designed to capture and convey corrosive liquid runoff in industrial facilities. They serve chemical process areas, electroplating shops, battery manufacturing plants, and fertilizer storage yards where conventional concrete drains are rapidly degraded by chemical attack. This page focuses on where these systems are used. For design strategies, see FRP Drainage Systems.
Concrete is porous. When the water carries sulfuric acid — or hydrochloric acid, or sodium hydroxide — the drain you poured last year starts to look like it's been there for fifty years. FRP drainage systems exist because that problem doesn't go away with better concrete.
Chemical spill containment: the primary driver
Behind a plating shop, floor drains carrying rinse water from nickel and chrome lines attack concrete. FRP trench drains, made with vinyl ester resin, don't leach. They arrive in 3–6 m sections and are installed without concrete curing time.
Fertilizer production and storage
Ammonium nitrate, urea, and MAP create solutions that corrode carbon steel and degrade concrete. FRP drains around bulk storage piles handle the full pH range without measurable wall loss.
Metal finishing and battery manufacturing
In lead-acid battery plants, sulfuric acid mist and spills are constant. Vinyl ester FRP handles sulfuric acid up to 50% at ambient temperature without degradation — something 316 stainless steel cannot match.
Chemical transfer and loading areas
Multi-product loading stations require a drain material that can handle 98% sulfuric acid one day and 50% sodium hydroxide the next. FRP with a properly selected resin system manages this chemical variability.
Typical site parameters
| Parameter | Typical Specification | Purpose |
|---|---|---|
| Channel cross-section | 150–600 mm width, 150–450 mm depth | Sized for anticipated flow |
| Section length | 3–6 m | Installable by hand or light equipment |
| Grating cover | FRP open-mesh, slotted, or solid | Load class A–C per EN 1433 |
| Chemical resistance | Vinyl ester or isophthalic | Matched to chemical inventory |
| Joint type | Fiberglass lamination or gasketed coupling | Liquid-tight per containment requirements |
| UV resistance | UV-inhibited surface veil | Prevents fiber bloom outdoors |
When FRP drainage isn't the answer
FRP drains have a maximum service temperature around 93–121°C, and high-velocity abrasive solids will erode the invert over time. Ceramic-lined or polymer-concrete drains may be better for those specific locations.
"The facility's original concrete trench drains required replacement every six years due to chemical attack. The FRP replacement channels, installed in 2013, have shown no measurable wall thickness loss."
This page focuses on where these systems are used. For design strategies, see FRP Drainage Systems.