API 570 Study Guide (Full) Exam Questions and Answers 100% Pass

API 570 Study Guide (Full) Exam Questions and Answers 100% Pass 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 During pipe fabrication who has overall responsibility for compliance with the code? - Answer- The owner/user Who has the responsibility to determine the extent of PMI (Positive Material Identification) performed? - Answer- The owner/user An inservice process pipe should be classified as Class 1 when the % of H2S exceeds: - Answer- 3% A welder becomes unqualified when he has not welded in: - Answer- 6 months A PQR test coupon with a shell thickness of "T" can generally be used to qualify a wall thickness on the WPS up to. - Answer- 2T A pressure test is always required: - Answer- whenever the authorized inspector believes one is necessary When can radiography not be used to qualify a welder? - Answer- when using the GMAW process with the short circuit mode Generally, raised face flanges should have a surface finish of: - Answer- 125-250 micro- inches During a direct visual exam of a pipe weld, the minimum light intensity should be: - Answer- 100 footcandles Describe the 3G welding test position. - Answer- Vertical groove Weld Seal welding pipe threads: - Answer- may be used to prevent leaks Liquid thermal relief valves should be set at a pressure not higher than: - Answer- 120 % When fabricating pipe, unknown materials: - Answer- Should never be used (except for door stops) The material verification program specified by API 578 covers: - Answer- only pressure containing components. what is the interval for thickness measurements on a class 1 piping system? - Answer- lesser of 5 years or half life of the pipe According to B31.3, a welder's qualification records f