ASME B16.5: Understanding the Dimensions and Pressure Ratings for Titanium Flanges.

The ASME B16.5 standard provides specifications for pipe flanges and flanged fittings in sizes NPS 1/2 through NPS 24, including titanium flanges. Here's an overview of the dimensions and pressure ratings for titanium flanges according to ASME B16.5:

1. Dimensions:

   • ASME B16.5 specifies dimensions such as bolt circle diameter, bolt hole diameter, flange face dimensions, and overall flange thickness for various sizes and pressure classes of flanges.
   • Titanium flanges manufactured to ASME B16.5 standards must adhere to these specified dimensions to ensure interchangeability and compatibility with other components in piping systems.

2. Pressure Ratings:

   • ASME B16.5 defines pressure classes for flanges ranging from 150 to 2500 pounds per square inch (psi), with titanium flanges typically available in pressure classes such as 150#, 300#, 600#, 900#, 1500#, and 2500#.
   • The pressure rating indicates the maximum pressure that the flange can withstand at a given temperature without failure. It is essential to select a flange with an appropriate pressure rating based on the operating conditions of the piping system.

3. Temperature Ratings:

   • In addition to pressure ratings, ASME B16.5 provides temperature limitations for flanges based on the material of construction. Titanium flanges are suitable for a wide range of temperatures, but specific temperature limitations may vary depending on the grade of titanium used.
   • It's crucial to consider both pressure and temperature ratings when selecting titanium flanges for a piping system to ensure they can withstand the intended operating conditions.

4. Facing and Finish:

   • ASME B16.5 specifies facing and finish requirements for flange surfaces, including raised face (RF), flat face (FF), and ring joint face (RTJ). These surface finishes are crucial for ensuring proper sealing between flanges and gaskets in the piping system.
   • Titanium flanges may have different facing and finish options depending on the application requirements and the type of gasket being used.

5. Materials:

   • ASME B16.5 allows for the use of various materials for flanges, including titanium. Titanium flanges are typically manufactured from grades such as Grade 2 or Grade 5 titanium, which offer excellent corrosion resistance and mechanical properties suitable for many industrial applications.
   • It's essential to select the appropriate grade of titanium based on the specific requirements of the piping system and the environmental conditions it will be exposed to.

When specifying titanium flanges according to ASME B16.5, it's essential to consider factors such as dimensions, pressure ratings, temperature limitations, facing and finish requirements, and material selection to ensure the safe and reliable operation of the piping system. Consulting the ASME B16.5 standard and working with experienced manufacturers and engineers can help ensure compliance with specifications and proper selection of titanium flanges for the intended application.