Standard Temperature for Hot Bolting

Hot bolting? The HBS, (hot bolting standard) covers this.

You don't get it.

I mean Codes like ASME... Sorry about the standard.

Hot bolting, at these latitudes, is a process whereby the corroded bolts on a pipe flange are replaced, one-at-a-time, with new bolts while the line is still under pressure....

I'm not very familiar with this practice, not under the name "Hot Bolting" anyway. I found The following information online and thought it might have the temperatures you need. Other documents were listed specificions specific to the company, which may indicate that "Hot Bolting" isn't widely standardized.

The Engineering Equipment Materials and Users Association (EEMUA) publish an information sheet called Guidance Procedures for the Removal and Replacement of Flanged Joint Bolting on Live Piping and Equipment. This is essential reading before carrying out any bolt work on live plant.

I am not sure you or maybe it is me that doesn't understand the term "Hot bolting" as you are using it in this post. I have been a direct enemy of one type of hot bolting ever since I first ran into it many years ago. This is when pipe fitters only put 1/2 of the bolts in pipe flanges that have 8 or more holes.

This has got to be one of the most blatant actions of disregard for design principle, engineering, personal safety, other peoples safety, equipment, Etc. and it really disgusts me to see it. I mean what idiot came up with the idea to use only half the required bolts to connect two flanges? Its probably is one reason why some upper management see the hands doing the actual work as people that can not be trusted to do it correctly without having to constantly watch them. I have to wonder if the fitters that decide to do this somehow know more than the guy that designed the flanges to start with. I guess it could be that I was absent on the day in school when they taught this was ok. I know that safety factors that are designed into things sometimes seem conservative but for a fitter who many times has no idea or even cares what will be in the piping system he is installing to decide to put only 1/2 of the bolts in a flange is ridiculous IMO

The other definition of hot bolting I have seen is like the other poster has already said when a fitter changes out one stud at a time on hot steam pipe flanges on a live system. We have a procedure for doing this and although using the right studs to start with is always better this type of hot bolting is useful and safe IMO

I have performed this definition of "hot bolting" many times in the past and unlike the first definition using a little bit of the safety factor to keep from shutting down a system to change out studs in a flange one at a time as ok as long as the person that is doing it knows how to do it correctly and safely, follows the procedure, and has all the studs required in the flange and tight when he is done

The 3rd type of "hot bolting" that I have seen and done a few times in the past was done to tighten turbine shell studs. This was a special procedure we used to tighten 3" OD studs to close to a million pounds of torque. Once all of 250 or so the bolts were tightened by hand and impact wrench then a special box end wrench that was supplied by the turbine manufacturer was set on the nut. After the wrench was in place a special torch that used oxy acetylene and compressed air for fuel was then set up to blow down into 1/2" hole in the bolt end to heat the stud. A millwright would tighten the nut in small increments as the stud started to stretch from the heat. Once a slot cut in the nut aligned with a reference slot cut on the turbine shell the apparatus was moved to the next stud and repeated till they all were finished. The consultant on the job told me that once they cooled the studs would have close to 1 million ft pounds of torque. This high amount of torque kept the turbine shell from leaking with only a thin linseed oil gasket in between.

I have never seen any mention of a "hot bolting" procedure in the ASME code but that doesn't mean it is not in there because I am sure that there is allot of things in the ASME and other code books that I'll never see.