API 570 COMPLETE QUESTIONS AND VERIFIED SOLUTIONS
⫸ 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
⫸ 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
