API 570 Study Guide (Full)Questions & Answers

Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on which weld orientation? - ANSWER longitudinal weld Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service? - ANSWER 10% for welded pipe, the normal thickness of under-tolerance is? - ANSWER .010 or 10 mils The corrosiveness of soils can be determined by measuring the soils: - ANSWER Resistivity when qualifying a weld procedure the essential variables must: - ANSWER be recorded on both the WPS & PQR In severe refinery services which type of pipe is normally used? - ANSWER seamless pipe a pipe has a thickness designation of "40S". what does the "S" mean? - ANSWER Stainless steel Generally socket-welded pipe is not used for nominal pipe sizes above: - ANSWER 2 inches A propane piping system should be classified as? - ANSWER Class 1 According to ASME/ANSI B16.5 flanges from plate materials can only be used for: - ANSWER Blind flanges Preheat should never be substituted for PWHT if: - ANSWER the PWHT was used to prevent environmental cracking. During welding, non-esential variables: - ANSWER Must be recorded only on the WPS and must be followed by the welder. During a hydrotest, all joints should be: - ANSWER left uninsulated ASME/ANSI B16.5 requires flanges to be: - ANSWER marked with the class rating. Graphitization of carbon steels begins to occur when metal temperatures exceed: - ANSWER 800°F