Using erw pipes to make cs elbows
Using erw pipes to make cs elbows
(OP)
can carbon steel erw pipes (and not seamless) be used to make 90degrees LR elbows using cold pressing (not heat induction)?
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Using erw pipes to make cs elbows
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Using erw pipes to make cs elbowsUsing erw pipes to make cs elbows(OP)
can carbon steel erw pipes (and not seamless) be used to make 90degrees LR elbows using cold pressing (not heat induction)?
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RE: Using erw pipes to make cs elbows
In this picture the seam would go along the top surface line, in a line connecting along the brightest light reflections.
What would you be doing, if you knew that you could not fail?
RE: Using erw pipes to make cs elbows
ASME B31.3 has a limit for outer fibre elongation for impact tested materials, and that might limit how tight your cold bend radius can be (332.4.2 (b)). Further, the same Code also states that if you are making elbows out of bent pipe, you must establish your pressure rating and thickness making use of the (sometimes called) Lorenz factors (304.2.1).
RE: Using erw pipes to make cs elbows
RE: Using erw pipes to make cs elbows
What would you be doing, if you knew that you could not fail?
RE: Using erw pipes to make cs elbows
the code is ASME b16.9,elbows WPB234, 1.5D & 1D, 90degrees. SCH20&40 from 1/2" to 12"
An internal mandral will be used.
Can you tell me if it is possible to make those elbows without breaking the seam during the cold pressing?
Thanks
RE: Using erw pipes to make cs elbows
What would you be doing, if you knew that you could not fail?
RE: Using erw pipes to make cs elbows
Orienting the long seam along the neutral axis of the bend (per BigInch) should mitigate most of the problems associated with failing at the seam - again, assuming that your wrinkling and ovality are within certain limits.
It might be prudent to call for before-and-after hardness tests on the bend extrados to attempt to quantify any strain hardening effects.