This paper explores a process to consider whether or not to use alternative assembly procedures such as those contained in Appendix F of the latest ASME Post Construction Code-1, Guidelines for Pressure Boundary Bolted Flange Joint Assembly [1]. The new edition of ASME PCC-1-2010 is greatly expanded, and Appendix F contains five assembly methods that vary from the traditional “Legacy Pattern” of incremental torque application in a “star” pattern up to a pre-selected target torque which is then followed by a circular pass (or passes) at a target torque. What reasons drive an end-user to use something besides the “tried and true” Legacy Pattern? What issues does the user need to consider? Which of the alternative assembly methods might work best for an end-user, and why? Safety, performance, and economics all must be balanced when evaluating relative risk. Given that risks are considered and managed appropriately — significant benefit is available to the end-user who uses a more stream-lined assembly method on selected applications.

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