How far should a 5/16" tube thickness extend past the tube sheet if there is no bevel or recess?

In pressure vessel design, particularly regarding the installation of tubes in a tube sheet, proper extending of the tube beyond the tube sheet is critical for structural integrity and efficient operation. For a tube with a thickness of 5/16", the acceptable extension beyond the tube sheet when there is no bevel or recess is typically specified in relevant codes and standards to ensure that there is sufficient material for proper sealing and strength under pressure.

The guideline that suggests extending the tube by 3/8" when the tube thickness is 5/16" accounts for the need to accommodate potential thermal expansion and to ensure that there is enough tube material engaged with the adjoining structure to prevent leaks. This extension allows for effective contact between the tube and the tube sheet, ensuring a secure fit and helping to prevent any potential failure points.

This specification is crucial because inadequate extension could lead to increased stress at the joint, compromising the assembly as the operating conditions fluctuate. Thus, the extension of 3/8" beyond the tube sheet is aligned with best practices in maintaining the integrity and safety of high-pressure boiler systems.