Troy Dualam Inc. shop-fabricates custom Fiberglass Reinforced Plastic (FRP) and Dual Laminate piping systems for heavy industrial and chemical processing environments, with engineering support defined by project scope. From process spools to distribution headers, elbows, manifolds and ducting, each system is fabricated to documented process chemistry, temperature, pressure, vacuum and project requirements.

Applications span chemical processing, chlor-alkali production, pulp and paper bleach plants, mineral processing, flue gas desulfurization (FGD), and industrial wastewater treatment where aggressive corrosion requires reliable fluid handling.

Manufacturing Scope and Sizing

  • Diameter range: Fabricated from 1-inch diameter up to 60-inch+ industrial headers, spools, manifolds, and ducting.
  • Fittings and components: Custom spools, segmented and molded elbows, reducing tees, concentric and eccentric reducers, Van Stone / stub-end flanged joints, and fixed FRP flanges.
  • Pressure and vacuum: Allowable pressure and vacuum are design-specific and limited by the lowest-rated compatible component or joint in the assembled system. A bolt-circle pattern establishes connection geometry, not complete-system pressure capacity.
  • Codes and standards: Applicable project specifications, codes and testing requirements are identified for each scope. TDI’s ASME RTP Certificate of Authorization RTP-51 applies only to the vessel shop-fabrication scope stated on the certificate; it is not certification of piping, fittings or ducting.

Solid FRP vs. Dual Laminate Construction

Material selection is governed by the documented fluid or mixture, concentration, temperature, pressure and vacuum, permeation risk, solids and abrasion, operating cycle, joint design and fabrication method:

  • Solid FRP piping: Uses a project-selected thermoset resin system. The resin-rich corrosion barrier and load-carrying structural laminate have different functions and are specified together.
  • Dual laminate piping: Combines a thermoplastic corrosion liner, usually fabricated with welded liner joints, with structural FRP backing. It may be selected when a solid-FRP corrosion barrier is not the preferred corrosion system for the defined service. Candidate liner materials can include PP, PVC-U, CPVC, PVDF, ECTFE, FEP and PFA.

Quality Control and Liner Testing

  • Liner inspection and testing: Thermoplastic liner welds are inspected and spark- or holiday-tested under the applicable fabrication and quality procedure before structural FRP backing is completed.
  • Dimensional inspection: Spool face-to-face dimensions, flange angular alignment and bolt-hole orientation are checked against the approved project requirements before shipment.
  • Pressure testing: Hydrostatic or other project tests are performed when required by the project specifications, design basis and approved quality plan.

Engineering Scope and Field Services

Troy Dualam Inc. fabricates piping to project specifications at its Elizabethtown, Ontario facility, with engineering support defined by project scope. Project-specific field installation, tie-ins and repair may be coordinated through Troy Dualam Services under a separate scope.

Frequently Asked Questions

What diameter piping systems can Troy Dualam manufacture?

Troy Dualam manufactures custom FRP and dual laminate piping from 1 inch up to 60 inches and larger for custom headers, distribution manifolds, and chemical ducting.

What is the difference between solid FRP and dual laminate piping?

Solid FRP piping uses a project-selected thermoset resin system in its corrosion barrier and structural laminate. Dual laminate piping uses a thermoplastic corrosion liner backed by structural FRP when that construction is selected for the defined service.

What design standards apply to industrial FRP piping?

The applicable project specifications, codes and testing requirements are identified for each piping scope. TDI’s ASME RTP Certificate of Authorization RTP-51 applies only to the vessel shop-fabrication scope stated on the certificate; it does not certify piping.

Discuss your industrial piping project with our engineering team. Contact Troy Dualam.