HI
We did an oval transition ring R55/R51, in order to adjust flanges 10"ANSI 2500 A 694 F60, with different groove sizes. In the valve side the flange groove is OK, but in the piping side the groove is below the specs . The groove size is 13/16" , but the same pitch diameter.
Also we performed a hydrotest for this job at a 5,860 psi, by 12 hours, and it was OK, but I need to be sure under normal operation conditions If I will not have problems with this transition ring. The diameter of the stud bolts are 2 1/2" and the torque is 4,400 pounds-feet.
Thanks is advance for your cooperation, I am enclosing a drawing of the flange and ring.