Mech_Ben
Mechanical
- Sep 25, 2024
- 3
I'm looking at our company standard drawings for dummy leg pipe supports for insulated lines, and there is no differentiation for use between hot lines and cold lines. No insulation is called out for the dummy leg itself, and the dummy leg is shown supported by a welded-on shoe.
For hot insulation I don't see a problem with this. (Yes, you'd loose some heat to the environment, but out hot pipe isn't THAT hot and heat retention efficiency is not of utmost importance.)
What I'm really wondering about is for cold-service lines (we're anywhere from 20F down to about -120F). I'm not too worried about heat being drawn into the process (though that is a consideration), what I'm most concerned about is condensation on the dummy leg leading to unsightly dripping and (even worse) corrosion over time.
I'm thinking the best answer is to insulate the dummy legs with the pipe and support on a cold shoe. Is this overkill? Has anyone else dealt with these, and is condensation/corrosion a concern here?
Thanks in advance.
Ben
For hot insulation I don't see a problem with this. (Yes, you'd loose some heat to the environment, but out hot pipe isn't THAT hot and heat retention efficiency is not of utmost importance.)
What I'm really wondering about is for cold-service lines (we're anywhere from 20F down to about -120F). I'm not too worried about heat being drawn into the process (though that is a consideration), what I'm most concerned about is condensation on the dummy leg leading to unsightly dripping and (even worse) corrosion over time.
I'm thinking the best answer is to insulate the dummy legs with the pipe and support on a cold shoe. Is this overkill? Has anyone else dealt with these, and is condensation/corrosion a concern here?
Thanks in advance.
Ben
