ASME Category D Fluid service, Under cut has two options

[Xrayz417]

For ASME Category D Fluid service, Under cut has two options, 1.5 mm and Tw/4 or 1 mm. What size of pipe would 1.5 mm apply to if Tw/4 or 1 mm is the lesser value? Any help on interpretation would be great.

 

[XL83NL]

Where haz I seen this question before?

 

[weldtek]

Xrayz,

Read note 6.