b.
Any other elongated indication which has a length greater than:
(1)
6.0 mm 1/4 inch for t up to 19.0 mm 3/4 inch, inclusive;
(2) 1/3 t for t from 19.0 mm 3/4 inch to 57.00 mm 2 1/4 inches,
inclusive;
(3) 19.00 mm 3/4 inch for t over 57.00 mm 2 1/4 inches where t is
the thickness of the thinner portion of the weld.
("t" pertains to the thickness of the weld being examined. If a weld joins
two members having different thickness at the weld, "t" is the thinner of
these two thicknesses.)
c.
Any group of indications in line that have an aggregate length
greater than t in a length of 12t, except where the distance
between the successive indications exceeds 6L where L is the
longest indication in the group.
d.
Porosity in excess of that shown acceptable in Appendix A-250,
Acceptance Standard for Radiographically Determined Rounded
Indications in Welds, ASME BPVC SEC I.
3.5.5
Ultrasonic Examination
Permitted for ASME B31.3 and ASME B31.4 piping only. Linear type
discontinuities are unacceptable if the amplitude exceeds the reference
level and discontinuities have lengths which exceed the following:
a.
6.0 mm 1/4 inch for t up to 19.0 mm 3/4 inch
b.
1/3 t for t from 19.0 mm 3/4 inch to 57.0 mm 2 1/4 inches
c.
19.0 mm 3/4 inch for t over 57.0 mm 2 1/4 inches
("t" is the thickness of the weld being examined. If the weld joins two
members having different thickness at the weld, "t" is the thinner of these
two thicknesses. Discontinuities are interpreted to be cracks, lack of
fusion, and incomplete penetration are unacceptable regardless of length.)
3.6
CORRECTIONS AND REPAIRS
**************************************************************************
NOTE: Insert the applicable ANSI piping codes.
ANSI B31.2, "Fuel Gas Piping," and ASME B31.8, "Gas
Transmission and Distribution Piping Systems," not
listed under paragraph entitled "References," may be
used.
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Remove defects and replace welds as specified in [ANSI Piping Standards]
[_____], unless otherwise specified. Repair defects discovered between
weld passes before additional weld material is deposited. Wherever a
defect is removed, and repair by welding is not required, the affected area
shall be blended into the surrounding surface eliminating sharp notches,
crevices, or corners. After defect removal is complete and before
rewelding, reexamine the area by the same test methods which first revealed
the defect to ensure that the defect has been eliminated. After rewelding,
reexamine the repaired area by the same test methods originally used for
SECTION 15216N
Page 21
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