Bolt Torquing and Flange Material
Bolt Torquing and Flange Material
(OP)
Hi Everybody,
I read most of the Bolt torquing subject here, but I do have a query, does the Flange Material have any influence on the Toruqe valve - the Flange material in the question is Duplex..do the torque value will be same if use Bolt material of A193-B7, and Spiral wound gasket (SS/Graphite)...appreciate a help on this..
Rau
I read most of the Bolt torquing subject here, but I do have a query, does the Flange Material have any influence on the Toruqe valve - the Flange material in the question is Duplex..do the torque value will be same if use Bolt material of A193-B7, and Spiral wound gasket (SS/Graphite)...appreciate a help on this..
Rau





RE: Bolt Torquing and Flange Material
RE: Bolt Torquing and Flange Material
RE: Bolt Torquing and Flange Material
Of course, this assumes that you are using torquing as you assembly method. You are going to use some sort of controlled bolting, right?
RE: Bolt Torquing and Flange Material
However, the use of washers is highly unusual in the hydrocarbon industry, where the leakage is a concern. There is no galling on the B7's, only in B8's on the 316 flanges. BTW, the B7 is rather unusual with duplex flanges and there is no galling on the Duplex flanges with any of SS bolts, perhaps it could be an issue with 316 flanges and 316 studs/nuts.
RE: Bolt Torquing and Flange Material
Not sure where you got this from, but torquing is rather widely used. I just completed a report for a client where they were torquing a 1-7/8" bolt. I'd be happier if more bolted flange joints were assembled using any controlled-bolting technique. My experience is that most small (3/4" and less) aren't even torqued - just a hand-wrench or a hammer-wrench.
(Full disclosure: I spent my first summer job working at an oil production field. The first 3 weeks were spent closing up manways from vessels that had undergone their periodic inspection. I NEVER saw a torque wrench at all, but spent most of those 3 weeks striking a hammer wrench with a sledgehammer. If there was a leak during start-up, I was chided that it was because I wasn't swinging the sledgehammer hard enough...)
RE: Bolt Torquing and Flange Material
RE: Bolt Torquing and Flange Material
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There is a lot on the internet regarding the hydraulic bolt tensioners. These are most common in the hydrocarbon industry. Ditch the spanner and the hammer. I hope that your first summer job was 20 years ago, not last year.
Cheers,
gr2vessels
RE: Bolt Torquing and Flange Material
Yes, that job was 20 years ago (will be this summer...).