Pipe size where RT is preferred for thickness readings

• <= 1 NPS

• <= 2 NPS

• <= 1/2 NPS

• <= 3/8 NPS

Pipe size where UT thickness readings may require specialized UT equipment

• <= 2 NPS

• <= 1 NPS

• <= 3 NPS

• <= 4 NPS

Small bore piping

• <=2

• <=1

• <=4

• <=3

Maximum pipe-size normally allowed for threaded pipe.

• 2 NPS

• 3 NPS

• 1 NPS

• 4 NPS

Maximum pipe-size normally allowed for socket-weld pipe.

• 2 NPS

• 4 NPS

• 1 NPS

• 5 NPS

Maximum pipe-size for performing an elliptical shot (double-wall technique,

double-wall viewing)

• 3 NPS

• 2 NPS

• 1 NPS

• 4 NPS

Pipe size where pipe OD is equal to pipe size (NPS)

• ≥ 14 NPS

• ≥ 12 NPS

• ≥ 10 NPS

• ≥ 8 NPS

Pipe size where pipe is almost always made using rolled & welded plate

• > 16 NPS

• > 17 NPS

• > 18 NPS

• > 20 NPS