API 570 Study Guide | 179 Questions and Answers(A+ Solution guide)

Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on which weld orientation? - longitudinal weld Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service? - 10% for welded pipe, the normal thickness of under-tolerance is? - .010 or 10 mils The corrosiveness of soils can be determined by measuring the soils: - Resistivity when qualifying a weld procedure the essential variables must: - be recorded on both the WPS & PQR In severe refinery services which type of pipe is normally used? - seamless pipe a pipe has a thickness designation of "40S". what does the "S" mean? - Stainless steel Generally socket-welded pipe is not used for nominal pipe sizes above: - 2 inches A propane piping system should be classified as? - Class 1 According to ASME/ANSI B16.5 flanges from plate materials can only be used for: - Blind flanges Preheat should never be substituted for PWHT if: - the PWHT was used to prevent environmental cracking. During welding, non-esential variables: - Must be recorded only on the WPS and must be followed by the welder.During a hydrotest, all joints should be: - left uninsulated ASME/ANSI B16.5 requires flanges to be: - marked with the class rating.