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Thank for your reply ... The tube is obround ..und the calculation are according to ASME IV

The tubes are obround and they are rolled to form a coil of Heating water Boiler ( ASME Section IV) @JStephen : it´s obround form but I thinck that App.13 is only for vessel and not for tubes !! @chicopee : if I use the article for the thickness calculation what about the bend calculation ...

of course I want to carry out the thickness calculation according to ASME code

I have the flowwing problem: The circular tubes are formed with rolls to have an oval or obround form .. The final form is not circular but obround. My question according to which formula could I calculate the thickness of these tubes ?

SnTMan, thanks for your reply.. but Fig UG-34 (p) is for cover with full-face gasket and it´s not my case.

I have a rectangular flat face flange with a rectangular flat face blind. There is no gasket in between the flanges. - UG-34 sketch(j) and (k) are only for bolted flat head with gasket. - Appendix Y : is only for circular flange. How could I calculate the thickness of the bolted rectangular...