API 570 EXAMS KEY CONCEPTS AND
PRACTICE QUESTIONS
◉ 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.
PRACTICE QUESTIONS
◉ 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.
