SC Pipelines Practice Questions - South Carolina Pipelines Contractor Examination Exam

Why does ASME B31.8 restrict threaded joints on steel pipe that will operate at a high hoop-stress percentage of SMYS?

NPT threads have a 55-degree angle that does not match US fittings Threading reduces wall thickness at the root of the thread and the joint does not develop the full strength of the pipe Threaded joints cannot be coated Threaded joints are prohibited on every gas pipe regardless of stress

Correct Answer:

Threading reduces wall thickness at the root of the thread and the joint does not develop the full strength of the pipe

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