Legend:
X - Indicates that test is required.
RT
Radiographic Examination
NOTES:
1/ Where new welds in piping intersects existing or older welds, the
latter welds shall be inspected for a distance of 150 mm 6 inches or a
distance equal to 50 percent of the pipe size diameter, whichever is less, as
measured from points of intersection. The existing or older weld and
adjacent base material shall be free from cracks. Where non-intersecting
adjacent existing welds are inadvertently radiographed, only cracks shall be
cause for rejection.
2/ MT/PT inspect the first or root pass of welds and when accessible, the
reverse or back-chipped ground, gouged or machined side prior to depositing
metal on the reverse side. Visual examination at 5X magnification may be
substituted for MT/PT inspection. Linear discontinuities shall be
unacceptable. Use 5X inspection where crevices cannot be cleaned thoroughly.
3/ MT/PT test shall be performed only when post-weld heat treatment is
required and when specified on drawing. The test shall be conducted after
heat treatment and shall include 6.28 radian 360 degrees of circumferential
weld surface and adjacent base material. Where 6.28 radian 360 degrees RT is
performed after heat treatment, MT/PT is not required, except where specified
on drawing.
4/ RT of welds on piping in the horizontal fixed position shall represent
a sector which was welded in the vertical or overhead position.
5/ In lieu of 1.05 radian 60 degree RT, PT or MT may be performed
on
the inside of a joint where weld is within 2 1/2 nominal pipe diameters from
the open end is back welded, has backing ring removed or used consumable
insert.
6/ RT is required where the working pressure exceeds 3964 kPa (gage) 575
psig. For working pressure 3964 kPa (gage) 575 psig and below, inspection
may be performed in lieu of RT.
-- End of Section --
SECTION 15212N
Page 51
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