Hello Mohammed89
Rings can be placed in the plane of the saddle, or alternatively can be placed either side of the saddle. There are some suggestion is ASME Section VIII, Division 2 Figures 4.15.3 and 4.15.4. You will have to try different arrangements until the bending stress is reduced to acceptable limits. We cannot give a rule as to how they should be placed.
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Sincerely,
Ray Delaforce
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Hexagon PPM