TABLE V
MANDATORY MINIMUM NONDESTRUCTIVE EXAMINATIONS FOR ASME B31.1 PIPING
___________________________________________________________________________
Temperatures over
Temperatures between
All others
750 degrees F and
350 degrees F and
at all pressures.
750 degrees F
inclusive and at
all pressures over
1052 psig gage
___________________________________________________________________________
3/4 inch or less.
Welded Branch
RT for NPS over
RT for branch over
Visual for
Connections
2 inch MT or PT
4 inch NPS and
all sizes
(Size indicated
for NPS 2 inch
thickness of branch
and
is Branch Size)
and less.
over 3/4 inch.
thicknesses.
Visual for all
sizes with branch
thickness 3/4 inch
or less.
Fillet, Socket
PT or MT for
Visual for all sizes
Visual for
Welds
all sizes and
and thicknesses.
all sizes and
thicknesses.
thicknesses.
NOTES:
1. Thickness refers to pressure boundary wall thickness (such as pipe
wall, fitting wall, or nozzle wall thickness).
2. All welds must be given a visual examination in addition to type of
specific nondestructive examination specified.
3. NPS-Nominal Pipe Size.
4. RT-Radiographic examination; MT-magnetic particle examination;
PT-liquid penetrant examination.
5. RT of branch welds shall be performed before any nonintegral
reinforcing material is applied.
6. The thickness of buttwelds is defined as the thicker of the two
abutting ends after end preparation.
7. Temperatures and pressures shown are design.
8. In lieu of radiography of welded branch connections when required
above, liquid penetrant or magnetic particle examination is acceptable and,
when used, shall be performed at the lesser of one-half of the weld thickness
or each 1/2 inch of weld thickness and all accessible final weld surfaces.
9. For nondestructive examination of the pressure retaining component,
refer to the standards listed in applicable code or the manufacturing
specifications.
-- End of Section --
SECTION 15216N
Page 25
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