Hydrolic tensioning space

[davidysong]

Do we need provide more space than usual for piping connection when hydrolic tensioning is supposed to use for large bolts?

for example, P&ID shows 10" flanged valve and 12x10 reducer, shoud I connect piping as 10" flanged valve, 200 mm pup, then 12x10 reducer?

or between flanged valve and elbow, should I provide a piece of pup instead of fitting to fitting?

 

[ricklts]

davidysong,

I'm a visual sort. Do you have picture/drawing to consider? What pressure ratings are the flange connections, what bolt loads are required, which tension tooling have you selected?

Quite often, when transistioning from on size to another, the overall length of the reducer is insufficient to allow placement of the tools on the smaller flange. If you were to weld the reducer directly to the 10" line, then add two 12" flanges, you should not have a problem. Costs may go up somewhat, but that better than not being able to fit the specified tooling in the field.

Rick

 

[LittleInch]

Do you need more space - yes. How much? Depends on your tensioner. Some are quite small but others need about 500 mm or more.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way