Notes – Page 7 – PipingNotes

Note#9

(PQR)procedure qualifications record: suggested procedure of welding which reflected in WPS if accepted

To calculate stud bolt size (flange thickness+ 1.5bolt dia.)2 + gasket thickness

The gap for socket weld 1.5mm to 3mm

Welding equipment require from 33A to 63A

The welding for stainless steel piping require purging by inert gas

Stainless steel pipe bundle always 6m for any size

Raised face flanges require ring gasket or spiral wound

Flat face flanges require full face gasket

Usually large bore piping for sizes ≥ 2.5″, small bore piping for sizes ≤ 2″