17:18 Nov-20-2009 Roger Duwe NDT Inspector, API-510, 570, 653 MISTRAS, USA, Joined Jan 2009 148
Re: Perfered DAC setup hole vs notchesIn Reply to Tony Smith at 07:08 Nov-20-2009 (Opening).
Notches are 'preferred' because side-drilled holes are so difficult to macnine into a pipe weld. Notches only give OD and ID. If feasable, 1/4 T /12 T and 3/4T side-drilled holes [like the ASME Basic block] would my strong preference.