i am working with client on a project of pipeline for water 20 km long. our design engineer designed the pipeline according to API 5L grade b 600 mm pipe using carbon steel of minimum yield strength of 30000 psi. i m confused as design engineer has approved 218 psi as hydro static test however my point of view is that it should be tested at 600 psi so i need help in this as what should be the test pressure
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