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ABOUT FLANGES  

Intro 4 Bolt 5 Bolt 6 Bolt 8 Bolt 12 Bolt 16 Bolt 20 Bolt 24 Bolt 28 Bolt 32 Bolt

BOLT TIGHTENING SEQUENCE FOR FLANGES USING 20 BOLTS.

Lubricate bolt and nut threads and nut bearing face (where it contacts the flange).

After flange assembly and all nuts have been run down by hand, start wrench tightening following the sequence of the numbers indicated (marking the number on the flange with a crayon aids in keeping track of the tightening process).

During all of the following steps, keep any gap between flanges even all around the circumference, and nuts made up approximately the same amount on each end of the bolt.

  • First time around just snug the nuts with a hand wrench.

  • Second time around tighten the nuts firmly with the same wrench.

  • Third time around apply approximately 25% recommended torque.

  • Fourth time apply approximately 75% of recommended torque.

  • Fifth time around, apply 100% of recommended torque.

  • Continue tightening nuts all around until nuts do not move under 100% recommended torque.

  • If possible, re-torque after 24 hours. Most of any bolt preload loss occurs within 24.