are a type of flange designed according to the standards set by both the American Society of Mechanical Engineers (ASME) and the American National Standards Institute (ANSI). These flanges are widely used in various industries due to their durability, reliability, and flexibility. They are available in various materials such as carbon steel, stainless steel, and alloy steel.

Types of ASME/ANSI B16.5 Flanges

ASME/ANSI B16.5 Flanges are available in various types, including weld neck flanges, slip-on flanges, blind flanges, socket weld flanges, lap joint flanges, and threaded flanges. Each type of flange has its unique features and applications. Here is a brief overview of each type of ASME/ANSI B16.5 flange:

  1. Weld Neck Flanges – Weld neck flanges are used for high-pressure and high-temperature applications. They are attached to pipes by welding and have a long tapered hub to provide reinforcement and prevent leakage.
  2. Slip-On Flanges – Slip-on flanges are easy to install and remove. They slide over the end of a pipe and are then welded in place.
  3. Blind Flanges – Blind flanges are used to close off the end of a pipe or valve. They are useful when maintenance or cleaning of the pipeline is required.
  4. Socket Weld Flanges – Socket weld flanges are used for small-size high-pressure piping. They have a socket to insert the pipe into and a recessed area for welding.
  5. Lap Joint Flanges – Lap joint flanges are used in combination with a stub end to create a flanged connection. They are ideal for applications requiring frequent dismantling.
  6. Threaded Flanges – Threaded flanges are used in low-pressure piping systems. They have threads on the inner surface to screw onto the pipe and provide a seal.

ASME/ANSI B16.5 Flange Dimensions

ASME/ANSI B16.5 flanges are available in a wide range of sizes, from 1/2″ to 24″. The flange size is determined by the size of the pipe it is being connected to. ASME/ANSI B16.5 flanges are available in various pressure classes, including 150, 300, 600, 900, 1500, and 2500. The pressure class of the flange determines its maximum working pressure at various temperatures.

ASME/ANSI B16.5 Flange Material Grades

ASME/ANSI B16.5 flanges are available in various materials, including carbon steel, stainless steel, and alloy steel. The material grade of the flange is determined by the material properties, such as corrosion resistance, temperature resistance, and strength. Here is a brief overview of the material grades used in ASME/ANSI B16.5 flanges:

  1. Carbon Steel – Carbon steel is the most commonly used material for ASME/ANSI B16.5 flanges. It is cost-effective and has excellent strength and toughness.
  2. Stainless Steel – Stainless steel is used in ASME/ANSI B16.5 flanges for its corrosion resistance and high-temperature resistance.
  3. Alloy Steel – Alloy steel is used in ASME/ANSI B16.5 flanges for its strength, toughness, and temperature resistance.

ASME/ANSI B16.5 Flange Facing Types

ASME/ANSI B16.5 flanges are available in various facing types, including raised face (RF), flat face (FF), and ring joint (RTJ). The facing type of the flange determines how it will mate with the gasket


By Shan Ali

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