Jam Nuts
Jam Nuts
(OP)
I'm trying to find information about the use of jam nuts and their reliability. Is there any documentation about the benefit of using one nut versus two on a pipeline flange? Any thoughts or ideas are appreciated.
Cheers,
Kat
Cheers,
Kat





RE: Jam Nuts
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
http://virtualpipeline.spaces.msn.com
RE: Jam Nuts
RE: Jam Nuts
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
http://virtualpipeline.spaces.msn.com
RE: Jam Nuts
RE: Jam Nuts
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
http://virtualpipeline.spaces.msn.com
RE: Jam Nuts
RE: Jam Nuts
RE: Jam Nuts
Bubz
RE: Jam Nuts
In my experience, the very best thing that can be done w/ flange bolts is to star torque to pre-set values w/ a compound (gear driven) torque wrench. DOuble nutting after that simply tries to maintain the first 'torque' value. Two things you need: (1) longer bolts, (b) two additional nuts per bolt plus the 10-20% normally lost. I know of no spec, code or requirement for double-mutting any offshore P/L flanges. Until then, it's not required and will raise costs (in time if not material).
We normally follw codes and specs which the client needs. If a client WANTS trhis - give it to him after explaining the labor and material cost. But remember: Its star-torquing that counts, everything else is BS.
regards.
ima-nemisis doig