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Could some one explain Why there is a thread relief on the Manual GV stem(see attached)? Is it for manufacturing ease? Then how would it help in manufacturing?

The left side dimension accomodates UV packing seal i think it should be total runout(tighter tolerance) whereas the right one not even gets in touch with stem so it could be cirular runout...im i thinking it correct....?

Belanger thanks for your insights....interms of inspection time will total runout be higher than circular?

Why wont they make a difference could you please explain...in some cases it is circular one side and total one side...

Hi Please see the attached drawing its a valve bonnet bore Why cant we use total run out on both the ends or circular runout on both sides.... UV packing comes on the Left side and stem will be passing through the bore there are two cases the stem may slide up and down or it may rotate...

As per API 6A 6BX flange Ring groove "concentricity shouldn't exceed 25mm of Total indicated runout".Does the highlighted statement can be used by giving position tolerance of 25mm at the groove keeping flange bore as DATUM please comment.....Is API 6A reffering to measuring of "total runout" of...

Hi im desiging a Tee fitting of 9*9*7 according to ASME B31.8 to use in subsea piping i am unable to decide how to account for thermal stresses in my design is it required to add if so how?i can perform analysys too...please suggest if you have any ideas