Cold Bend vs Induction Bend
Cold Bend vs Induction Bend
(OP)
Hi, we were asked to replace some cold bend items for induction bend in the construction of a pipeline built in accordance with ASME B31.4.
What can you say to me about this issue? They say that will be easy for them to use induction bend instead of the cold bends.
What can you say to me about this issue? They say that will be easy for them to use induction bend instead of the cold bends.





RE: Cold Bend vs Induction Bend
RE: Cold Bend vs Induction Bend
From 30D to 40D.
API 5L Gr B.
Thanks
RE: Cold Bend vs Induction Bend
Hardly any arc to these bends if 30 and 40 is correct.
RE: Cold Bend vs Induction Bend
ASME B31.4 just talks about cold bend and give minimum values for that.
RE: Cold Bend vs Induction Bend
RE: Cold Bend vs Induction Bend
But is there any problem with this substitution?
RE: Cold Bend vs Induction Bend
However, I would really question their ability to do such large bends on an induction bending machine. Maximum radius on small machines is roughly 60", mid-range machines is 175", and approximately 400" on larger machines.
RE: Cold Bend vs Induction Bend
RE: Cold Bend vs Induction Bend
RE: Cold Bend vs Induction Bend
RE: Cold Bend vs Induction Bend
RE: Cold Bend vs Induction Bend
You haven't clearly stated what radius the induction bends will now be (Usually 5D) and what range of angles are they talking about.
It's a little surprising that this wasn't defined or worked out during the design and issue of the alignment sheets, but there's quite a lot missing in this story...
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Cold Bend vs Induction Bend
canadapipe
The arcs of parallel pipes do not need to have the same turning centerpoint, therefore the radaii of each line's bend could be kept equal and induction bend geometries kept the same, simply by using different centerpoints for each pipe line. Parallel pipelines are not like rails on train tracks. I would much prefer to use unique centerpoints and have equal geometry for all bends (induction or not).
RE: Cold Bend vs Induction Bend
RE: Cold Bend vs Induction Bend