Grinding on P91 weld joint

[tamal1475]

Is there any special precaution to be followed if we grind off surface irregularities on weld joints of heavy walled P91 header pipes? Will it affect if we do the grinding before or after PWHT? The surface ripples on the SMAW weld runs are interfering with the NDT.

 

[metengr]

If typical grinding measures are followed as with other weld joints, no.

 

[DekDee]

Just remember if MT or PT is required do it after grinding and not before.