TinnerFlow
Stainless & Specialty Duct ยท Specialty Materials

Fiberglass-reinforced plastic duct

Corrosive process exhaust

ConnectionLaminated butt joint or FRP flange
SupportWide saddles/engineered frames

Before you start

  • Confirm resin system, duct construction, service chemistry, temperature, joint type, laminate schedule, cure conditions, support detail, and manufacturer procedure.
  • Inspect FRP for cracks, delamination, soft spots, voids, chipped flanges, and UV or handling damage.
  • Check ambient temperature and humidity against the approved resin and cure requirements.
  • Plan safe handling and resin work with required PPE and ventilation.

Tools and materials

FRP duct, approved resin and reinforcement materials or gasketed FRP flanges, surface-preparation tools, mixing and application equipment, compatible gasket and fasteners, wide saddles or engineered frames, PPE, ventilation equipment, cure-monitoring materials, and inspection light.

Lay it out

  1. Lay out supports, joint access, cure workspace, and flange orientation.
  2. Keep enough room around laminated joints for the full wrap and inspection.
  3. Plan wide support contact areas to avoid point loading.

Set and support it

  1. Use wide saddles or engineered frames matching the manufacturer detail.
  2. Support both sections fully before laminating or bolting the joint.
  3. Protect FRP edges from concentrated clamps and metal rigging.

Make the connection

  1. 1

    Prepare surfaces exactly as the manufacturer procedure requires.

  2. 2

    Align sections without forcing or cracking the laminate.

  3. 3

    For a laminated butt joint, mix and apply resin and reinforcement in the required sequence and thickness.

  4. 4

    For a flanged joint, install the compatible gasket and tighten hardware evenly.

  5. 5

    Protect the joint during the full cure period.

  6. 6

    Inspect for voids, dry fiber, cracks, incomplete cure, or displaced gasket.

  7. 7

    Release temporary support only after the joint has reached the required condition.

Check the install

  • The resin system and joint method match the service.
  • The joint is fully cured or evenly gasketed.
  • No void, crack, dry fiber, delamination, or flange damage is present.
  • Supports distribute load over a broad area.
  • No point load or forced misalignment remains.

Common mistakes

  • Working outside the resin temperature or humidity limits.
  • Clamping FRP like metal and cracking a flange.
  • Moving the joint before full cure.
  • Using an incompatible gasket, resin, or cleaning solvent.

Stop and ask

Stop if ambient conditions, resin system, laminate schedule, cure time, support detail, or chemical compatibility does not match the manufacturer requirements.