All thread roods
All thread roods
(OP)
Can two flages be connected using all thread rods instead of machine bolts? Contractor bought 10' long pieces of all thread rods and they cut them on site to use them as bolts to connect flanges and also to connect butterfly valves to flnages. Our specs don't mention anything about the allowable bolts and I want to know what the industry standard is.
See Pictures!!
See Pictures!!





RE: All thread roods
He needs to look up the information and give it to you. If he cannot find it, have him adhere to the spec at his cost.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: All thread roods
Should they? Maybe not. How strong do the connections need to be? Is all thread strong enough?
What is the industry standard? What industry are you in? What country are you in?
RE: All thread roods
With that said, the strength of these joints depends on the grade of stud that was used and the method of tightening it. If the specification called for Grade 8 bolts, then B-7 studs would normally be considered to be equivalent. But, since the contractor cut up sections of all-thread rather than buying pre-cut studs which likely would have been stamped on the ends, it may be difficult to verify that the stud grade is correct.
If you are responsible for the integrity of these joints, they you need to be sure that the fasteners are appropriate. But, there is no fundamental reason that I am aware of that studs would be inferior to bolts as long as the strength was the same or better. In fact, studs are likely to be superior because each nut can turn independently. As long as they are tightened correctly, then you are less likely to have a problem with a stud. I prefer studs and our specifications require them.
Johnny Pellin
RE: All thread roods
I have had Fastenal supply 3 ft. lengths of B7, so marked on one end.
pantro1977, I agree it is your contractor's responsibilty to PROVE what he has supplied. If he cut a spec stud material into pieces there will be no markings, no proof.
Regards,
Mike
RE: All thread roods
Rotation of the flange is a non-issue. It will rotate like crazy. But in this case, that's probably ok. While I would never specify allthread as a flange bolting material for typical pipe flanges, these rings are neither what I would consider flanges nor likely to be built to any flange standard. Is the material of the allthread identified?
If it passes hydrotest, and the fabricator had no spec in his PO saying that he could not do this, it's probably legal and it'll probably work just fine.
jt
RE: All thread roods