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The bolt tightening sequence for a 28-bolt flange typically follows a star or crisscross pattern to ensure even distribution of stress and prevent distortion. This means starting from a specified bolt (often the top or a designated bolt) and tightening sequentially to the opposite bolt, then moving to the adjacent bolts in a systematic manner. This method helps achieve a uniform clamp load across all bolts, which is crucial for maintaining a proper seal and structural integrity. Always refer to the specific manufacturer's guidelines for the exact sequence and torque specifications.

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2w ago

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What is the bolt tightening sequence for 44 hole flange?

Begin tightening by rotating nuts clockwise, choosing one bolt first, then choosing the bolt 180° opposite second. then one at 90° and then the one 180° from that. Then step over one nut from the first nut tightened (decide for yourself clockwise or counter-clockwise) and continue the same pattern as with the first four. .... Number the flange clockwise with this sequence: 1, 13, 25, 9, 17, 5, 33, 21, 3, 15, 27, 11, 31, 19, 7, 35, 23, 2, 26, 10, 30, 18, 6, 34, 22, 4, 16, 28, 12, 32, 20, 8, 36 & 24. Now tighten in the criss cross pattern using the numbers. continue to increase torque and go through the pattern until you reach your final torque.


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