Threadolet on the side of an elbow?
Threadolet on the side of an elbow?
(OP)
I have a customer that wants us to design a bypass chamber with an odd drain configuration. We have a pipe with a short radius elbow butt welded to the bottom of the pipe and they want a hole bored into the side of the elbow to attach a threadolet, which will then have an extended body gate valve attached for a drain. Our bypass chamber designs typically are per B31.3. Where in the ASME codes would a modification such as this be addressed?
Material - A-105 CS
Design pressure - 95 psi
Design temp - 725F
Flanges - 300#
hydro test - 1125 psi
Material - A-105 CS
Design pressure - 95 psi
Design temp - 725F
Flanges - 300#
hydro test - 1125 psi





RE: Threadolet on the side of an elbow?
Others may comment on this (as Im not sure); as you've altered a standard fitting, its not standard anymore, so you might have to qualify it to 304.7.2.
The elbolet at least gives some presumption of fulfilling Code requirements wrt 304.3.
RE: Threadolet on the side of an elbow?
When you do your calculations for a Branch attachment you should use the Maximum Operating Temperature not the Design Temperature.
Just my opinion
prognosis: Lead or Lag
RE: Threadolet on the side of an elbow?
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Threadolet on the side of an elbow?