Pipe bend in Section VIII, Div 1
Pipe bend in Section VIII, Div 1
(OP)
I would like to know how pipe bend (carbon steel material) is handled in Section VIII, Div.1:
1. Is there any requirement on minimum radius?
2. How to calculate minimum required thickness?
3. How to handle the thinning out after bending?
1. Is there any requirement on minimum radius?
2. How to calculate minimum required thickness?
3. How to handle the thinning out after bending?





RE: Pipe bend in Section VIII, Div 1
The pipes which are bent to make elbows are having limitations on the dimensions upto which they can be bent.
If i recall correctly we were not allowed to use those pipes which were cold bent after the variation in the dimensions was found to exceed 8%.
When we bend a pipe, it becomes elliptical at the bent area.The OD at both the axes is to be measured and the difference should not exceed 8% of the original OD.
The thickness should be measured at all the stressed locations and compared with the design for usage.Also, the flow required should be calculated after measuring the new dimensions(ID=OD-2t).
RE: Pipe bend in Section VIII, Div 1
RE: Pipe bend in Section VIII, Div 1
RE: Pipe bend in Section VIII, Div 1
RE: Pipe bend in Section VIII, Div 1
The standard minus tolerance of 12.5% is for sure conservative, however if you take it fully into account you'll avoid any discussions with the inspector...
prex
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RE: Pipe bend in Section VIII, Div 1
RE: Pipe bend in Section VIII, Div 1
Alternatively, you can add margins of 12.% to min wall plus the standard wall thinning based on the B31.1 table.
RE: Pipe bend in Section VIII, Div 1