FRP for Chemical Plants: Tanks, Scrubbers, Grating and Cable Tray

In short: In a chemical plant, FRP (fiber-reinforced plastic, also called GRP) earns its place wherever acids, salts, chlorine compounds or wet corrosive fumes attack steel. The typical footprint runs from the tank farm (acid and process tanks), through exhaust systems (fume scrubbers, fans and ducts) and piping, to the access structures (grating, handrail, ladders) and cable routes (cable tray and supports) around them. Each item is only as good as its resin, laminate and design for your actual chemicals and temperatures, so it is built to order. FIBROVX makes every item to your drawing, chemical, size and color.

How to use this guide

This is a map of where FRP is used across a chemical plant and what to ask for in each area. It is not a chemical resistance chart. For the method of choosing resin and laminate for a specific chemical, see the FRP chemical resistance guide. For other sectors, see our industries page.

Why chemical plants use FRP

Carbon steel corrodes quickly in acid and chloride service, and coatings fail first at welds, edges and damage points. Stainless and nickel alloys resist more chemicals but are expensive, and common austenitic grades can suffer chloride stress corrosion cracking, which the Specialty Steel Industry of North America notes is rare below about 60 °C when the steel is fully immersed, while evaporative conditions can cause cracking well below that. FRP takes a different route: a resin-rich corrosion barrier faces the chemical, and a glass-reinforced structural laminate behind it carries the load.

Resin makers publish what that barrier looks like in state-of-the-art equipment. The resin manufacturer's chemical resistance guide describes a corrosion barrier 2.5 to 6.3 mm (100 to 250 mil) thick: a first layer of 0.3 to 0.8 mm (10 to 20 mil) that is about 95% resin with one or two surfacing veils, backed by chopped strand mat at about 75% resin. Its resistance tables assume that construction. That is why a "fiberglass" product off a general shelf is not the same as corrosion-grade equipment.

FRP also has limits that matter in a chemical plant:

• Temperature. Every resin has a maximum service temperature for each chemical, and it is often well below the resin's heat distortion temperature. See FRP temperature limits by resin type.
• Some chemicals. Strong oxidizers, some solvents and hydrofluoric acid need specific resins, veils or other materials. Resin guides mark some combinations "not recommended".
• Fire. FRP is combustible. Fire-retardant resins reduce flame spread but do not make it non-combustible.
• Mechanical abuse. Impact, point loads and poor supports cause more FRP failures in practice than chemical attack.

Area 1: the tank farm

Storage and day tanks are the core FRP item in most chemical plants. Typical services include hydrochloric acid, sodium hypochlorite, ferric and aluminum salts, dilute sulfuric acid, caustic within the resin's limits, brine and process water.

What to decide for each tank:

• Chemical, concentration and temperature, including upsets, cleaning and steam-out.
• Construction method. Filament-wound and contact-molded tanks are both covered by ASTM D3299-26; ASTM withdrew the older contact-molded standard, ASTM D4097, in 2026. Many owners specify one of these, or ASME RTP-1 for critical service. Tell us which standard your project requires.
• Capacity and orientation, vertical or horizontal, and the foundation or saddles.
• Nozzle schedule: size, flange rating, orientation and projection for each nozzle, plus manways, vents, overflow and level instruments.
• Outdoor duty: UV protection, wind and seismic loads, insulation or heat tracing.
• Venting and fumes. Fuming acids such as hydrochloric acid release vapor during filling. Vents are often routed to a scrubber.

For an in-depth example, see FRP tanks for hydrochloric acid and our FRP hydrochloric acid tanks. For non-corrosive water storage in the same plant, such as fire water or cooling make-up, modular FRP water tanks are a separate product, assembled from molded panels on site. Do not use panel water tanks for acid storage.

A spec checklist for tanks is in our FRP tank data sheet checklist.

Area 2: process exhaust and fume scrubbers

Reactors, acid tanks, pickling lines and loading stations release acid or alkaline fumes. A packed-bed wet scrubber removes them by contacting the exhaust air with a scrubbing liquid flowing down through packing. Gas and liquid flow in opposite directions. Our FRP acid fume scrubbers are this type.

FRP suits scrubbers because the wet, acidic gas would corrode a steel shell, and the same resin family can be used for the shell, packing supports, spray headers and mist eliminator. Points to settle:

• Air flow and pollutants: the gas, its concentration and temperature at the inlet.
• Required outlet: your permit or local emission limit.
• Scrubbing liquid: caustic soda solution is the most common choice for acid gases such as HCl, according to EPA; an acidic solution is used for alkaline gases such as ammonia.
• Separate systems where fumes would react, for example acid and ammonia exhaust.
• Scope: fan, recirculation pump, dosing and controls, or the scrubber only.

Our guides to packed-bed scrubber sizing and acid fume scrubbers for electroplating and PCB plants go further.

Area 3: fans, ducts and pipe

The ductwork and fan that move corrosive exhaust see the same chemistry as the scrubber, often with condensation. FRP fans and FRP ducts avoid the rust and coating repairs common with steel. Size the fan for the full system pressure drop, including scrubber, packing, mist eliminator and stack. See our FRP fan selection guide.

For liquids, FRP pipes and FRP flanges carry acids, brines and wastewater. Pipe needs the same care as tanks: the right resin for the fluid, supports at the right spacing, and expansion allowed for. Our FRP vs HDPE vs steel pipe guide compares the options.

Area 4: grating, stairs, handrail and ladders

Walkways and platforms around acid tanks, pumps and scrubbers take spills, splash and washdown. Steel grating there rusts at the bearing bars and the welds. FRP molded grating does not rust, is non-conductive and is cut on site with standard tools. Cut edges must be sealed with resin.

Decisions for access structures:

• Grating type: molded grating, with two-way strength and good corrosion resistance, or pultruded grating for longer spans. See molded vs pultruded FRP grating.
• Resin: the resin should suit the chemicals that can splash or pool on the floor.
• Load and span: from your support layout and the loads you need, confirmed against supplier data.
• Surface: a gritted surface for wet or oily floors.
• Fire: if your code or insurer sets flame-spread limits, ask for test data. See FRP grating fire ratings and ASTM E84.

Handrail and ladders follow the same logic. See FRP handrail systems and FRP ladders, and our guide to designing FRP platforms with grating, profiles and handrail.

Area 5: cable tray and supports

Instrument and power cables run through the same corrosive areas. Galvanized steel tray corrodes in acid fume and chloride atmospheres, and the cut ends and fasteners go first. Pultruded FRP cable trays in ladder, trough and channel types, with covers and fittings, avoid that, and they are non-conductive.

What to send:

• Tray type, width and side height.
• Run length and fittings list.
• Support span, and any point or ice loads.
• Cover requirement.
• The standard you work to. In North America, nonmetallic cable tray is covered by UL 568 and CSA C22.2 No. 126.2; the older NEMA FG 1 was rescinded in 2017, according to the Cable Tray Institute. International projects often cite IEC 61537.

See FRP cable tray load and span selection and FRP cable tray standards.

Utilities and wastewater

Most chemical plants have their own water treatment and effluent plant. FRP turns up there as covers on odorous tanks, grating, dosing tanks and pipe. See our guide to FRP in wastewater treatment plants. Cooling systems may use FRP cooling towers and fill. See the FRP cooling towers guide.

Where FRP is not the right answer

A good supplier should tell you when not to use FRP:

• High-temperature service above the resin's limit for that chemical.
• Chemicals marked "not recommended" for every resin you could use, or solvents that swell the resin.
• Fire-critical areas where your code requires non-combustible materials.
• Heavy vehicle loads on grating, or high point loads on thin laminates.
• Pressure vessels under codes that do not cover FRP for your service.

In those places, steel, stainless, alloys, lined steel or thermoplastics may be better. Some plants use dual laminate construction: a thermoplastic liner backed by FRP.

How we customize for chemical plants

Every FIBROVX item is made to order. That means:

• Tanks and vessels: capacity, diameter, height, nozzle schedule, manways, ladders and lifting lugs to your drawing.
• Scrubbers: sized to your air flow and pollutant, with packing, spray and mist eliminator.
• Grating and access: panel size, height, mesh, resin, surface and color, with cut-outs for pipes and equipment.
• Cable tray: type, width, side height, lengths, fittings and covers.
• Resin and laminate: chosen for your chemical and temperature, with test data and drawings for the item quoted.

Product pages include reference properties and load examples. The values and supporting evidence applicable to the quoted item are confirmed in writing. FIBROVX does not hold an ASME RTP-1 certificate.

Quick notes for common chemical plant services

These are screening notes only. Always confirm against current maker data for your exact conditions.

• Hydrochloric acid. A common FRP service. Fumes from the vent need handling, often in a scrubber. See FRP tanks for hydrochloric acid.
• Hydrofluoric acid and fluorides. Synthetic or carbon veil, never glass veil alone.
• Sodium hypochlorite. Veil rules and cure details matter. No carbon veil.
• Caustic soda. Veil choice carries much of the duty. The resin manufacturer's chemical resistance guide prefers apertured synthetic veil for some hot caustic services and allows carbon veil in alkaline service above 50 °C (120 °F).
• Solvents. Some swell or soften the resin. Check each one, including cleaning solvents.
• Mixed or changing streams. Select for the most aggressive condition in the sequence.

Common mistakes

• Buying "fiberglass" without a corrosion barrier suited to the chemical.
• Specifying by normal conditions only and forgetting cleaning, upsets and steam-out.
• Ignoring the outside of the equipment. Spills, fumes and UV attack the exterior too.
• Mixing up products, such as using panel water tanks for chemicals.
• Leaving cut edges unsealed on grating and tray.
• Undersizing the fan by leaving out the scrubber and mist eliminator pressure drop.

Plant areas at a glance

Watch: FRP for Chemical Plants in 27 Seconds

Large tanks and lift stations

For bulk storage beyond shipping limits, field-wound tanks reach DN25000; drainage and effluent lift duties can use prefabricated FRP pumping stations.

FAQ

What is FRP used for in chemical plants?

Mainly storage and process tanks, fume scrubbers, fans and ducts, pipe, grating, handrail, ladders and cable tray, in areas where acids, salts or corrosive fumes attack steel.

Is FRP resistant to all chemicals?

No. Resistance depends on the resin, the laminate construction, the chemical, its concentration and the temperature. Some combinations are not recommended. Check each service against resin maker data.

Is GRP the same as FRP?

Yes. GRP (glass-reinforced plastic) is the common UK term for glass-fiber FRP. See FRP vs GRP vs fiberglass.

Can FRP grating be used around acid tanks?

Yes, it is one of its main uses, provided the resin suits the chemicals that can reach the floor and the panel is rated for your span and load.

Does FIBROVX supply complete systems?

We build each item to your drawing and scope. Tell us what you need, for example a scrubber with fan and pump, and we will confirm what is included in the quotation.

Related guides

• FRP chemical resistance guide
• FRP tanks for hydrochloric acid
• FRP scrubbers guide
• FRP grating guide
• FRP cable tray guide

Sources

• A resin manufacturer, epoxy vinyl ester resins chemical resistance guide (corrosion barrier 2.5–6.3 mm / 100–250 mil; 10–20 mil, 95% resin inner layer; about 75% resin chopped mat)
• A resin manufacturer, resin selection guide for chemical resistance (not-recommended entries; veil notes)
• ASTM D3299, Filament-wound glass-fiber-reinforced thermoset resin corrosion-resistant tanks: https://store.astm.org/d3299-26.html
• ASTM D4097, Contact-molded glass-fiber-reinforced thermoset resin corrosion-resistant tanks (withdrawn 2026): https://store.astm.org/d4097-19.html
• ASME RTP-1, Reinforced Thermoset Plastic Corrosion-Resistant Equipment: https://www.asme.org/codes-standards/find-codes-standards/reinforced-thermoset-plastic-corrosion-resistant-equipment
• Cable Tray Institute, Codes and Standards (UL 568 nonmetallic cable tray; NEMA FG 1 rescinded November 2017): https://www.cabletrays.org/codes-and-standards/
• US EPA, Air Pollution Control Technology Fact Sheet: Packed-Bed/Packed-Tower Wet Scrubber (counter-current flow; scrubbing liquids): https://frtr.gov/matrix/documents/Vapor-Treatment/Packed-Bed-Packed-Tower-Fact-Sheet.pdf
• SSINA, Chloride Stress Corrosion Cracking (rare below 60 °C when fully immersed; lower under evaporative conditions): https://www.ssina.com/education/corrosion/chloride-stress-corrosion-cracking/
• FIBROVX product pages for hydrochloric acid tanks, acid fume scrubbers, cable trays, molded grating and water tanks: https://fibrovx.com/pages/industries
• A resin manufacturer, Resin selection guide for chemical resistance (footnotes 1, 2, 3, 8, 9, 12, 14, 17, 23; LS definition)