ASME B16.47: Large Diameter Titanium Flanges for Process Piping Applications.

ASME B16.47 is a standard that specifically addresses large diameter steel flanges for use in high-pressure and high-temperature industrial applications. However, it does not include specifications for titanium flanges. For titanium flanges, ASME B16.5 is typically the applicable standard.

Here are some key points regarding ASME B16.47 and its relevance to titanium flanges for process piping applications:

1. Scope: ASME B16.47 covers large diameter steel flanges in sizes NPS 26 through NPS 60. It includes series A and series B flanges, with series B flanges having larger bolt circles and higher pressure ratings.

2. Pressure Classes: The standard provides pressure ratings for series A and series B flanges, ranging from Class 75 to Class 900. These pressure classes specify the maximum allowable pressure for flanges at various temperatures.

3. Dimensions and Tolerances: ASME B16.47 specifies dimensions, tolerances, bolt hole sizes, bolt circles, facing types, and other relevant parameters for large diameter steel flanges. These dimensions ensure interchangeability and compatibility between flanges from different manufacturers.

4. Facing and Finish: The standard includes requirements for facing types, such as raised face (RF), flat face (FF), and ring type joint (RTJ), as well as surface finishes for flange sealing surfaces.

5. Materials: ASME B16.47 primarily focuses on steel flanges, with specifications for various steel grades suitable for high-pressure and high-temperature applications. While the standard does not specifically cover titanium flanges, manufacturers may use similar principles and requirements when producing titanium flanges for process piping applications.

6. Testing and Inspection: ASME B16.47 outlines requirements for testing and inspection of large diameter steel flanges to ensure conformance to specified standards and performance criteria. These may include non-destructive testing (NDT), such as ultrasonic testing (UT) and dye penetrant testing (PT), as well as mechanical testing and dimensional inspection.

For titanium flanges used in process piping applications, ASME B16.5 is typically the applicable standard. However, manufacturers may still follow principles of ASME B16.47, such as those related to dimensions, facing types, pressure ratings, and quality assurance, while adapting them to suit the specific requirements of titanium materials and process piping applications. It's essential to consult with reputable manufacturers and engineers familiar with titanium materials and ASME standards to ensure the proper selection and design of titanium flanges for process piping systems.