Flange Joint Assembly and Bolt-up Procedures

By Vincent A. Carucci

This article summarizes good flange assembly practices that may be used to help develop detailed flange boltup procedures. Controlled-torque boltup procedures are the methods of choice for achieving reliable boltup of most flanged joints in typical process plant services. However, the specific flange boltup procedure used (e.g., hammer and wrench, controlled-torque, stud tensioner, etc.) depends on flange service and design conditions.

The use of appropriate flange assembly and boltup procedures will eliminate many flange leakage problems. Go “back to the basics” first when dealing with such problems.