Hi,
Newbie in the forum here !!
We have a 12" Ball Valve ( Trunion Mounted ) installed in our corrosive oil line, the OEM provided ENP coating for the ball, which lead to peeling of the coating and increased the opening torque of the Valve.
We have now decided to repair the Ball using SS316 overlay cladding ( 3mm ).
Now we are in dilemma, that what repair standard we have to follow, as no API RP ( API6DR or 621 ) states about ball repair procedure including the requirement of Post Weld Heattreatment and required surface finish of the ball.
Do anyone knows which Standard have to be followed for ball weld repair and is PWH is required for it and reccomended overlay thickness ?
Also about Ra value and machining methodology
Newbie in the forum here !!
We have a 12" Ball Valve ( Trunion Mounted ) installed in our corrosive oil line, the OEM provided ENP coating for the ball, which lead to peeling of the coating and increased the opening torque of the Valve.
We have now decided to repair the Ball using SS316 overlay cladding ( 3mm ).
Now we are in dilemma, that what repair standard we have to follow, as no API RP ( API6DR or 621 ) states about ball repair procedure including the requirement of Post Weld Heattreatment and required surface finish of the ball.
Do anyone knows which Standard have to be followed for ball weld repair and is PWH is required for it and reccomended overlay thickness ?
Also about Ra value and machining methodology
