Schedule 80 PVC Flanges

Schedule 80 PVC flanges are durable, high-pressure fittings used to connect pipes, valves, and equipment in industrial systems. Thicker than Schedule 40 options, these flanges are ideal for pressure applications and harsh environments. They provide a bolt-together connection point for easy system assembly and disassembly.

Maxx Supply offers a wide selection of PVC flange styles — including Slip, SP, FPT, and Blind — to meet the needs of any system layout. Our products are made from premium PVC materials that meet ASTM D1784 standards for strength and corrosion resistance. We’re committed to quality, competitive pricing, flexible return policy, and outstanding customer service, with a full inventory of PVC fittings to keep your system running smoothly.

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Suitability & Applications

Schedule 80 PVC flanges are built for demanding systems that require high strength, chemical resistance, and leak-free performance. Their robust wall thickness and durable construction make them ideal for:

  • Chemical processing plants, where corrosion resistance is critical
  • Chilled water distribution systems and HVAC applications requiring tight seals
  • Potable and wastewater systems, both commercial and municipal
  • Acid and base handling setups, including lab work and industrial tanks
  • Irrigation systems that experience varied pressure conditions

They’re commonly used alongside ball valves, gate valves, check valves, balancing valves, and other PVC pipe components to regulate flow and ensure efficient operations. These flanges allow quick access for cleaning, inspection, or replacement — especially in areas with high maintenance demands. The typical maximum service temperature is around 140°F.

Sizing Guidance & Compatibility

To select the right flange, match it to your system’s nominal pipe size and schedule rating — these flanges are specifically designed for Schedule 80 fittings and pipes. Each flange type has its own fit:

  • Slip flanges slide over the pipe end for easy alignment
  • FPT flanges feature internal threads for connection to male-threaded pipe
  • Blind flanges seal off system ends or allow for future expansions

All Maxx Supply flanges follow ANSI B16.5 bolt patterns, ensuring compatibility with standard pipe layouts. Use the proper gasket material for your fluid type and operating temperature and consider temperature derating when working near maximum pressure limits.

Schedule 80 Flange Installation

Proper installation helps extend the life of your PVC flange and maintain system integrity. Follow these best practices:

  • Use a suitable PVC primer and cement when gluing flanges to pipe
  • Tighten flange bolts in a crisscross (star) pattern to ensure even pressure
  • Never use the flange as structural support — the pipe must be independently braced
  • Re-torque bolts periodically during service to maintain seal integrity
  • Regularly inspect for leaks, gasket degradation, or flange face wear

These practices are essential for both new builds and ongoing maintenance in industrial piping systems.

Common Use Cases

Schedule 80 PVC flanges are a go-to solution for systems that require frequent access or rapid assembly:

  • Clean-in-place (CIP) systems, where flanges simplify disconnection
  • Bracketing valve assemblies to allow fast swap-outs or inspections
  • Sampling or metering ports in lab and field setups
  • Temporary process lines, such as those used in pilot plants or testing environments
  • Junction boxes and connection hubs in complex fluid-handling designs

Their versatility and strength make them a reliable option across a wide range of industrial, plumbing, and mechanical projects.