Regarding the customer’s requirement for plate elbows, the wall thickness shall not exceed 115% of the nominal thickness
Thread Content
The use of DN100 (NPS 4) and larger butt-welded elbows with a wall thickness greater than that specified, as well as elbows with tapered bores to meet the thickness requirements outlined in the purchase order, will not be accepted. For elbows manufactured from plate, a final thickness that is 15% greater than the nominal specified thickness will also not be accepted. I’m not sure how this is determined I understand, is it at the end face groove?
The final thickness, that is, the thickness of the finished product, must not be more than 1.15 times the nominal thickness. It doesn’t say which port
What is the consideration behind this upper limit on thickness? I don’t quite understand
One of my guesses is that at the elbows, if the wall thickness becomes too large, stress concentration is likely to occur, so it is necessary to control the wall thickness.
It is likely that this is done to ensure that the properties of the steel plate do not change due to variations in thickness.
That’s right; for example, if a thickness of 9.5 is required but in reality 12 layers are used for welding, then this violates the aforementioned agreement. However, stress concentration may not necessarily occur
I’ve checked it; this corresponds to the wall thickness specified by the user, which must not exceed 1.15 times the specified value. Therefore, 12 mm does not meet the requirements