Size, Pressure & Special Routing · Size, Pressure & Special Routing
High-pressure rectangular duct
Supply/process
ConnectionHigh-pressure TDC/angle/welded
SupportEngineered supports
Before you start
- Confirm pressure class, gauge, seam, reinforcement, joint system, gasket or sealant, fastener pattern, support design, and test requirements.
- Inspect every section for correct construction and complete reinforcement.
- Separate high-pressure components from ordinary low-pressure parts.
- Verify the project-specific sealing and testing plan.
Tools and materials
High-pressure rectangular duct, approved high-pressure TDC, angle, or welded joint components, specified gasket and sealant, reinforcement and tie rods, engineered supports, clamps, drift pins, approved fasteners, and test equipment.
Lay it out
- Mark support and joint locations.
- Keep test access available.
- Coordinate reinforcement and fitting orientation.
Set and support it
- Install engineered supports.
- Support sections independently during fit-up.
- Keep joints unloaded.
Make the connection
- 1
Verify construction against the pressure class.
- 2
Install the specified gasket.
- 3
Align and clamp the joint.
- 4
Install every required corner, cleat, bolt, fastener, tie rod, and reinforcement piece.
- 5
Seal seams and joints as specified.
- 6
Inspect before concealment.
- 7
Complete required pressure testing.
Check the install
- Construction matches the pressure class.
- Every joint component is installed.
- Reinforcement is complete.
- Seams and joints are sealed.
- Testing meets the approved requirement.
Common mistakes
- Using low-pressure hardware on a high-pressure system.
- Skipping a cleat, bolt, or tie rod.
- Covering the run before testing.
- Using sealant to compensate for incomplete mechanical connection.
Stop and ask
Stop if gauge, seam, reinforcement, joint, support, or sealing does not match the approved pressure class.