API 570 Study Guide (Full) Questions and Answers Rated A+

API 570 Study Guide (Full) Questions and Answers Rated A+ 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. Graphitization of carbon steels begins to occur when metal temperatures exceed: 800°F During pipe fabrication who has overall responsibility for compliance with the code? The owner/user Who has the responsibility to determine the extent of PMI (Positive Material Identification) performed? The owner/user An inservice process pipe should be classified as Class 1 when the % of H2S exceeds: 3% A welder becomes unqualified when he has not welded in: 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. 2T A pressure test is always required: whenever the authorized inspector believes one is necessary When can radiography not be used to qualify a welder? when using the GMAW process with the short circuit mode Generally, raised face flanges should have a surface finish of: 125-250 micro- inches During a direct visual exam of a pipe weld,