API 570 STUDY SHEET SOLVED QUESTIONS WITH CORRECT 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
⫸ when qualifying a weld procedure the esential variables must:
Answer: be recorded on both the WPS & PQR
⫸ 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
⫸ The corrosiveness of soils can be determined by measuring the
soils: Answer: Resistivity
⫸ Preheat should never be substituted for PWHT if: Answer: The
PWHT was designed 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: owner/user
⫸ Who has the responsibility to determine the extent of PMI
performed? Answer: owner/user
⫸ 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
⫸ when qualifying a weld procedure the esential variables must:
Answer: be recorded on both the WPS & PQR
⫸ 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
⫸ The corrosiveness of soils can be determined by measuring the
soils: Answer: Resistivity
⫸ Preheat should never be substituted for PWHT if: Answer: The
PWHT was designed 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: owner/user
⫸ Who has the responsibility to determine the extent of PMI
performed? Answer: owner/user
