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发表于 2011-3-22 19:04
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来自： 中国江苏扬州
焊接章里
Chapter 3
Section 4.
The butt-welded joints of the following
pipelines shall be subjected to radiographic inspection
as follows:
a) All pipelines in pipe class I: 100%.
A reduction in the scope of the test may be
agreed on application for pipelines with an inside
diameter ≤ 75 mm, provided that proof is
furnished that the results are consistently good
and that the percentage of repairs is relatively
low.
b) All cargo and process lines of gas tankers with
a service temperature below – 10°C: 100 %.
A reduction in the scope of the test may be
agreed on application for pipelines with an inside
diameter ≤ 75 mm or wall thicknesses ≤ 10
mm provided that proof is furnished that the
results are consistently good and that the percentage
of repairs is relatively low.
c) All pipelines in pipe class II: 10 %.
A reduction in the scope of the test may be
agreed on application for pipelines with an inside
diameter ≤ 100 mm provided that proof is
furnished that the results are consistently good
and that the percentage of repairs is relatively
low.
d) Where the execution of welding operations
gives rise to doubts as to the quality of the
welded joints, the Society may also call for a
random radiographic test to be carried out on
the butt welds of pipe class III.
The radiographic inspection shall as a rule be performed
with an X-ray tube. With the Society's consent,
radiographic inspection may be replaced by
ultrasonic inspection for ferritic steel pipes with wall
thicknesses ≥ 20 mm. |
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