flattening SS pipe properly
flattening SS pipe properly
(OP)
I am going to make a SSseamless pipe at 1.5" sch40 into a flow meter and I need to change the cross section shape. I intend to flatten pipe to about 1/2" height for fluid to pass through. When I do this, I think I am going to have a bit of a problem. I think the rating of the pipe for pressure will no longer be valid. Does anyone know of a method to do this and not loss pipe intregrity. I have not yet found a standard to cover this type of process hot or cold forming yet.





RE: flattening SS pipe properly
The motivation to use round pipe in the first place is for strength, so if you change it to any other section, you're going to lose some strength. You could start with heavier pipe, or possibly a size larger and heavier-wall pipe, or perhaps machine it out of bar stock or other means.
RE: flattening SS pipe properly
The pipe stress picture will change because with a perfectly round pipe we only have a nice clean hoop stress and a longitudinal stress, due to pressure, plus any beam bending stresses. Whereas what you are talking about may change the wall thickness and also the circumferential stress picture. You have a pressure vessel with flat sides and some radiused corners over some length, and then a transition back to round. This causes a much more complex stress picture both hoop stresses and bending stresses in the circumferential direction, plus the other stresses.
RE: flattening SS pipe properly
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: flattening SS pipe properly
Mike Halloran
Pembroke Pines, FL, USA
RE: flattening SS pipe properly