As per ASME BPVC QW-461.9, Welder/Welding operator Qualified on Plate is also qualified to weld pipe
• Welder/welding operator qualified on plate is also qualified to weld pipe greater than 24” (610mm)
• Welder/welding operator qualified on plate is also qualified to weld pipe greater 73mm (2*7/8”) OD to 24” (610mm)
Be careful about the positional restriction mentioned on each case. During manual welding except 2G position, hollow section would be stationary on supports and welding position would change frequently. But, during machine welding (Submerged Arc Welding) hollow section will be rotated with the help of rollers, this allows welding operator to deposit weld metal on flat position
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