WPQ – Qualified Positions ASME IX
- According to ASME BPVC.IX-2019, Table QW-461.9
- (1) Positions of welding as shown in QW-461.1 and QW-461.2.
F = Flat
H = Horizontal
V = Vertical
O = Overhead
SP = Special Positions (see QW-303.3)
- (2) Tack welds are not limited by pipe or tube diameters when their aggregate length does not exceed 25% of the weld circumference.
- (4) See diameter restrictions in QW-452.3, QW-452.4, and QW-452.6.