Schedule 80 CPVC flanges are industrial pipe fittings used for connecting pipes, valves, and equipment in systems that run at high pressures and high temperatures—a reliable choice when you need corrosion resistance and long service life alongside compatible CPVC fittings.
Compared with Schedule 40, Schedule 80 wall thickness supports higher working pressures. Compared with PVC, CPVC delivers better high-temperature and chemical performance for demanding service. CPVC meets ASTM D1784 requirements and follow ANSI/ASME bolt patterns common in the United States.
Choosing the right style depends on how you build, seal, and maintain your system.
Solid (Slip) Flanges
Best for: Permanent connections on lines that don’t need frequent disassembly.
Why use: Straightforward install and robust sealing; pairs well with gasketed connections.
Good to know: Ideal where alignment is fixed and space is tight.
Loose Ring (Van Stone) Flanges
Best for: Systems requiring regular maintenance or where slight misalignment needs correction.
Why use: The rotating ring simplifies bolt hole alignment and speeds reassembly.
Good to know: Reduces stress on the pipe during assembly/disassembly.
FPT (Female Pipe Thread) Flanges
Best for: Threaded transitions and instrument/valve tie-ins without solvent welding.
Why use: Creates a secure threaded connection that can be useful for retrofits.
Good to know: Apply thread sealant compatible with CPVC; do not over-torque.
Socket Weld (SP) Flanges
Best for: Solvent-welded systems needing a reliable, leak-resistant bond.
Why use: Consistent, permanent joints and smooth internal bore.
Good to know: Follow cure times before pressure testing or introducing hot fluids.
Applications for CPVC Flanges
Chemical processing & hot corrosive liquids: CPVC’s chemical resistance and temperature tolerance outperform PVC in many industrial environments.
Industrial water & HVAC support systems: Dependable connections for pumps, filters, heat exchangers, and PRM filtration or similar equipment.
Plumbing, irrigation, pool/spa: Corrosion-resistant alternative to metal flanges in chlorinated or salt environments.
Potable water: May be used when certified—always confirm product details and local code requirements.
Thermal movement & maintenance: Pair with an expansion joint where needed to manage temperature changes and reduce stress during assembly/servicing.
Why Schedule 80 CPVC?
Durability & pressure handling: Thicker Schedule 80 walls help manage higher system pressures.
Cost-effectiveness: Lightweight, corrosion-resistant plastic fittings can reduce installation time and maintenance versus metal.
Broad compatibility: Pairs well with CPVC Schedule 80 fittings, standard gaskets, and common bolt patterns; verify CPVC flange dimensions for your equipment.
Installation Tips
A concise checklist to help ensure proper sealing and long-term performance:
Inspect & dry-fit: Confirm CPVC flange dimensions, face type, and bolt pattern. Check gasket material compatibility with media and temperature.
Cut & prep pipe: Square-cut, deburr, and chamfer pipe ends. Wipe away dust and moisture.
Solvent-welded (Socket) joints: Use CPVC-approved primer/cement; apply evenly and assemble with a quarter-turn twist. Hold briefly, then allow full cure per manufacturer before pressurizing.
Threaded joints (FPT): Use CPVC-compatible thread sealant/tape; hand-tighten plus small wrench turns—avoid cracking from over-torque.
Gasket install: Center the gasket and avoid adhesives unless specified. Do not reuse crushed or chemically attacked gaskets.
Bolt-up sequence: Tighten in a crisscross/star pattern in multiple passes to the recommended flange torque specifications. Re-check torque after initial heat/cool cycles.
Alignment & support: Use proper hangers and guides; avoid using bolts to “pull” misaligned piping together.
Pressure test & inspect: Bring pressure up gradually, check for weeping, and re-torque as required by the manufacturer.
Maintenance: Periodically verify bolt torque and gasket condition, especially on thermal cycling or vibration-prone lines.
Tip: Always consult the product’s CPVC flange standards and installation instructions. Be sure to follow all local codes and safety procedures.
Why Order CPVC Flanges from Maxx Supply?
Stocked range, ready to ship: Popular sizes ½"–2" and styles (Slip, Van Stone, FPT, Socket) reduce downtime.
Reliable sourcing: Consistent quality from vetted manufacturers, with robust product details and specifications to guide selection.
Helpful experts: Our team assists with part selection, CPVC flange compatibility, and installation best practices.
Trusted by pros: Contractors, plant maintenance teams, and procurement departments rely on Maxx Supply for fast turnaround and dependable service.
