High Pressure Piping Design, B31.3, start at 2500 psi?
High Pressure Piping Design, B31.3, start at 2500 psi?
(OP)
I try to understand if we can determined if we design an high pressure system when the pumps before the piping push at 3500 psig?
Has it a value to determined when it's a High Pressure Piping Design, like specify in the B31.3, Chapter IX? When the owner doesn't know...
Is high pressure at 2 500 psig? 5 000 psig, 10 000 psig?
many thanks for your help!
Has it a value to determined when it's a High Pressure Piping Design, like specify in the B31.3, Chapter IX? When the owner doesn't know...
Is high pressure at 2 500 psig? 5 000 psig, 10 000 psig?
many thanks for your help!
Mechanical Engineer





RE: High Pressure Piping Design, B31.3, start at 2500 psi?
Did that a year or more ago [2500# and 100% RT/UT, etc], everything is running well.
RE: High Pressure Piping Design, B31.3, start at 2500 psi?
The problem I have with that is I want to modify a little manifold bloc valve. The owner doesn't want to weld a piece of pipe (diameter 1 inch). So I saw in the Chapter IX the specification for using thread and what I found is I couldn't make NPT thread to connect my pipe. I should use something like "Swagelok", but I don't find how to make a good thread in a Stainless Steel (SS) bloc because that become not standard...
Any suggestions about how to make a good assembly with thread in a bloc of SS ?
Is only welding assembly respecting the B31.3 in my case?
Mechanical Engineer
RE: High Pressure Piping Design, B31.3, start at 2500 psi?
RE: High Pressure Piping Design, B31.3, start at 2500 psi?
http://ww
To 'cover' yourself for audits, etc. write a Line Spec that puts all the foregoing on paper, to include Corrosion Allowances. Then follow that Spec, as it is now your "Written Practice".
RE: High Pressure Piping Design, B31.3, start at 2500 psi?
Where did you find "High-Pressure" start at 4000 psi? In the B31.3 ?
Thanks Moltenmetal,
In my case I'm at ambiant temperature and my fluid is water...
Mechanical Engineer
RE: High Pressure Piping Design, B31.3, start at 2500 psi?
RE: High Pressure Piping Design, B31.3, start at 2500 psi?
Thanks I see I'm at higher than class 2500. Do you know a reference showing how to determine the class?
Mechanical Engineer
RE: High Pressure Piping Design, B31.3, start at 2500 psi?
As for the 4000#, it is one of my "rules of thumb". B31.3 expects the Owner or Piping Engineer to decide where to declare "High Pressure". Since I can buy off-the-shelf flanges for Class 2500 pressure & temperature, and Sch 160 or XXS [do the calc's and leave a Corrosion Allopwance] work, I don't go to the full-blown High Pressure rules until about 4000# design pressure.
RE: High Pressure Piping Design, B31.3, start at 2500 psi?
RE: High Pressure Piping Design, B31.3, start at 2500 psi?
I don't want to imagine how hard it could be to find parts for a 10 000pisg system because for 3500psig it was pretty cool ;)
Thanks guys!
Mechanical Engineer