What is the Bolt tightening sequence for 40 holes flange?

The bolt tightening sequence for a 40-hole flange typically involves a staggered pattern to ensure even distribution of load and prevent warping. Begin by tightening bolts in a star or crisscross pattern, moving from the center outward or from one side to the opposite side. The bolts should be tightened in multiple passes, gradually increasing the torque to the specified value. This method helps to achieve uniform preload and maintain the integrity of the flange joint.