Bolt Tightening Sequence
Bolt Tightening Sequence
(OP)
My Client has requested a bolt-tightening sequence to be included in the installation guidelines document for an Offshore Flexible Riser 2-piece Hang-off Clamp which has a horizontal circular PCD bolt group and a vertical rectangular bolt group.
Do Engineers usually just specify 3-stage spiral sequence (just like most car engine head-bolts)or is there some kind of calc I should be doing??
Do Engineers usually just specify 3-stage spiral sequence (just like most car engine head-bolts)or is there some kind of calc I should be doing??





RE: Bolt Tightening Sequence
Most multi-bolted joints use a cross or star pattern in two (or more) stages: tighten all joints to snug condition, then tighten to final level. Some critical flange joints (e.g. liquid/gas sealing requirements) use matrix algebra to calculate interaction coefficients to arrive at the desired preload for all bolts.
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Bolt Tightening Sequence
stages in tightening. Use 1/2 the torque value thru
the first sequence, and then repeat with the full
torque value for the final round. We normally recommend
3 stages in tightening if it is critical.
RE: Bolt Tightening Sequence
RE: Bolt Tightening Sequence
Hope this helps.
RE: Bolt Tightening Sequence