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[多选题]
根据《石油天然气钢质管道无损检测》(SY/T4109-2013),II级、III级对接接头内不应存在下列哪些缺陷?()
A.未焊透
B.烧穿
C.裂纹
D.条性缺欠
E.外表面未熔合
查看答案
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A.未焊透
B.烧穿
C.裂纹
D.条性缺欠
E.外表面未熔合
A.15min
B.10min
C.20min
D.5min
A.5-50
B.5-40
C.2-40
D.2-50
A.5%
B.10%
C.15%
D.20%
A.复合管
B.非金属管
C.PE管
D.聚乙烯管