Flanged connection for underground piping
Flanged connection for underground piping
(OP)
We have been required to install CS piping (fire water) underground with flanged connection to avoid hot work inside a living plant. Is there any requirements for buried flanged connection like a dedicated pit for bolt access?





RE: Flanged connection for underground piping
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Flanged connection for underground piping
There are caps you can buy that are full of grease to protect the studs so the nuts will come off. They work, but add a lot of expense to the makeup. Without some serious protection you won't be able to get the nuts off the studs after just a few months and will have to scarf them off with a torch (probably more hot work than just welding them in the first place).
Setting a valve can for a flange creates far more problems than it solves.
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. —Galileo Galilei, Italian Physicist
RE: Flanged connection for underground piping
As said I would have thought that there were better materials for a buried fire main, but that's a different question.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Flanged connection for underground piping
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. —Galileo Galilei, Italian Physicist
RE: Flanged connection for underground piping
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Flanged connection for underground piping
RE: Flanged connection for underground piping
I guess I would only add that flanged piping on paper is basically just straight and really allows for conforming to unanticipated changes in (mis)alignment, cover, non-uniform support/settlement, or beam loads etc. by stressing the pipe and gasketed joint. I noticed a few years ago BigInch on the Pipelines.... forum wrote,
“All flanges are a necessary evil. Sometimes the evil is above ground, sometimes below. Wishing away the evil usually doesn't work.” BigInch 2011