If you shop for industrial PVC fittings, valves, or flanges in the United States, such as those you find at 247Garden.com, you may come across terms like:

  • Class 150
  • ANSI 150
  • ASME Class 150
  • 150 lb Flange

For PVC fittings, “Class 150” refers to a standardized U.S. flange connection system used across industrial piping applications.

What Does Class 150 Mean?

Class 150 is a flange standard established by ANSI and ASME for pipe connection dimensions.

It defines:

  • bolt hole spacing,
  • bolt circle diameter,
  • flange thickness,
  • flange face dimensions,
  • overall compatibility between connected components.

A Class 150 PVC flange is designed to connect with other Class 150 equipment such as:

  • pumps,
  • valves,
  • tanks,
  • filters,
  • industrial piping systems.

This standard allows components from different manufacturers to connect properly using the same bolt pattern and flange dimensions.

Why Is Class 150 Common in PVC Systems?

Class 150 flanges are widely used in:

  • irrigation systems,
  • water treatment,
  • aquaculture,
  • hydroponics,
  • industrial water piping,
  • chemical handling systems.

PVC manufacturers use these standardized flange dimensions so PVC systems can integrate with common U.S. industrial equipment.

Other Common Flange Classes

Besides Class 150, other ANSI/ASME flange classes include:

Flange ClassTypical Applications
Class 150General industrial and water systems
Class 300Heavier-duty industrial piping
Class 600Industrial process systems
Class 900Specialized industrial equipment
Class 1500High-performance industrial service
Class 2500Extreme industrial applications

For PVC piping, Class 150 is the most commonly used flange standard.

Higher flange classes are generally used with:

  • steel piping,
  • steam systems,
  • refinery equipment,
  • high-temperature industrial systems.

Class 150 vs SCH40 and SCH80

Class 150 and pipe schedules are different specifications.

SCH40 and SCH80

These refer to:

  • pipe wall thickness,
  • fitting body thickness,
  • overall pipe dimensions.

Class 150

This refers specifically to:

  • flange connection dimensions,
  • bolt patterns,
  • equipment compatibility.

For example:

  • both SCH40 and SCH80 PVC systems may use Class 150 flanges.

247Garden PVC Flange Systems

247Garden offers PVC fittings and valves designed for compatibility with standard U.S. piping systems commonly used in:

  • irrigation,
  • hydroponics,
  • filtration,
  • aquaculture,
  • industrial plumbing applications.

Using standardized flange systems helps simplify installation and equipment matching across a wide range of projects.

Final Thoughts

Class 150 PVC fittings refer to standardized ANSI/ASME flange dimensions used throughout U.S. piping systems.

The standard ensures compatibility between connected equipment by defining:

  • bolt patterns,
  • flange sizing,
  • and mating dimensions.

It remains the most common flange standard used in PVC industrial and irrigation systems today.

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