Tubesheet bolting - not using Nuts!!
Tubesheet bolting - not using Nuts!!
(OP)
Hi all
I am working on a fixed tubesheet which is bolted to the flange of channel. We always have used nuts and stud bolts to fasten tubesheet and channel, but this time we are going to thread the tubesheet and remove the nuts.
Have you ever had the same experience? What is the risk? What is the difference in the calculation?
Thanks in advance
I am working on a fixed tubesheet which is bolted to the flange of channel. We always have used nuts and stud bolts to fasten tubesheet and channel, but this time we are going to thread the tubesheet and remove the nuts.
Have you ever had the same experience? What is the risk? What is the difference in the calculation?
Thanks in advance





RE: Tubesheet bolting - not using Nuts!!
In the future, it may be difficult to replace a damaged stud, as it may be seized into the tubesheet. You should flat or square one end of each stud for wrenching on.
If threads in the tubesheet are damaged, it can be difficult to repair.
It is a poor practice, you should have a really good reason to do so.
Only difference in the calculation is to check thread engagement into the tubesheet.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Tubesheet bolting - not using Nuts!!
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P.E. Metallurgy, Plymouth Tube
RE: Tubesheet bolting - not using Nuts!!
Matt
Quality, quantity, cost. Pick two.
RE: Tubesheet bolting - not using Nuts!!
No risk with this design. See UG-43 (g)for tapped hole
Regards
r6155
RE: Tubesheet bolting - not using Nuts!!
Then you can hang the tubesheet off of pins while starting the bolts.
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P.E. Metallurgy, Plymouth Tube
RE: Tubesheet bolting - not using Nuts!!
1) Install all studs in threaded holes, then install the head channel. All studs are used for alignment.
I worked several times with figure UG-40 (a-2) similar as mentioned in 1)
Regards
r6155
RE: Tubesheet bolting - not using Nuts!!
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P.E. Metallurgy, Plymouth Tube
RE: Tubesheet bolting - not using Nuts!!
Stud shall be used for threaded hole.
Regards
r6155