Generic bolts often have damaged galvanizing due to field welding. Part VII chairs are typically fabricated from G60/G90 galvanized steel with specific weld requirements that preserve the coating.
For detailed calculations, you can find technical breakdowns on platforms like or specialized design repositories like used in the AISI E-1 calculation? Part VII - Anchor Bolt Chairs - Petroblog aisi e 1 volume ii part vii anchor bolt chairs better
The guidelines provided in AISI E 1 Volume II Part VII for anchor bolt chairs are considered the gold standard in the industry. Here's why: Generic bolts often have damaged galvanizing due to
The "better" aspect of the AISI approach lies in its detailed analysis of load paths. The standard accounts for the interaction between the chair components and the cylindrical shell. It recognizes that the stiffness of the chair plates distributes the localized point load of the bolt over a larger area of the shell, reducing the risk of localized buckling or yielding. By following Part VII, engineers can verify that the stress induced in the shell remains within allowable limits, preventing catastrophic failure at the skirt-to-shell junction. Part VII - Anchor Bolt Chairs - Petroblog