A pipe visual inspection
Visual inspection should be piece by piece.
2 surface should be smooth oxide.
3 not the depth is greater than the nominal wall thickness of 5%, and the maximum depth is not gained more than 0.8mm of scarring,
folding send, rolling, folding, separation and other defects.
4 depth of more than nominal wall thickness of 12% or greater than 1.6mm mechanical scratches and pits should be removed.
Two pipe shape and size to check
Pipe shape and size to check
The shape and size of the pipe should be individually examined, and shall conform to the requirements of the standard 4 and 6.1.
Pipe cloth hardness test
Carbon steel and austenitic stainless steel pipe fittings, each batch should be pumping 3% and not less than two hardness test results
if an inappropriate, should redouble their inspection, if there is a failed, should be piece by piece test. Alloy steel pipe should be
piece by piece, the hardness test.
Four pipe fittings of non-destructive testing
1 of the following products should be by magnetic particle or penetrant testing
A carbon steel, stainless steel, three or four.
The various types of B alloy steel pipe fittings.
2 test according to the provisions of JB 4730, I-level qualified.
3, no micro-cracks.
5, low temperature impact toughness test
16MnDR, 09Mn2VDR low temperature steel, have to do low temperature Charpy impact test, the test specimen should be selected in the same
batch of base metal, and pipe the same as the final heat treatment condition. Test requirements and test results should be consistent
with the provisions of the GB150.
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