API 570 STUDY GUIDE (FULL)
EXAM WITH CORRECT
ANSWERS 2025
Pressure applied inside a pipe creates stress in the pipe wall. These
stresses are highest on which weld orientation? ( Correct answers )
longitudinal weld
Per B31.3, how much RT is conducted on circumferential welds of a pipe
in normal service? ( Correct answers ) 10%
for welded pipe, the normal thickness of under-tolerance is? ( Correct
answers ) .010 or 10 mils
The corrosiveness of soils can be determined by measuring the soils:
( Correct answers
) Resistivity
when qualifying a weld procedure the essential variables must: ( Correct
answers ) be recorded on both the WPS & PQR
In severe refinery services which type of pipe is normally used? ( Correct
answers ) seamless pipe
a pipe has a thickness designation of "40S". what does the "S" mean?
( Correct answers ) Stainless steel
Generally socket-welded pipe is not used for nominal pipe sizes above:
( Correct answers ) 2 inches
A propane piping system should be classified as? ( Correct answers )
Class 1
According to ASME/ANSI B16.5 flanges from plate materials can only be
used for: ( Correct answers ) Blind flanges
Preheat should never be substituted for PWHT if: ( Correct answers ) the
PWHT was used to prevent environmental cracking.
During welding, non-esential variables: ( Correct answers ) Must be
recorded only on the WPS and must be followed by the welder.
During a hydrotest, all joints should be: ( Correct answers ) left
uninsulated
GRADED
ASME/ANSI
A+ B16.5 requires flanges to be: ( Correct answers ) marked with
the class rating.
, Graphitization of carbon steels begins to occur when metal
temperatures exceed: ( Correct answers ) 800°F
During pipe fabrication who has overall responsibility for compliance with
the code? ( Correct answers ) The owner/user
Who has the responsibility to determine the extent of PMI
(Positive Material Identification) performed? ( Correct answers )
The owner/user
An inservice process pipe should be classified as Class 1 when the % of H2S
exceeds: ( Correct answers ) 3%
A welder becomes unqualified when he has not welded in: ( Correct
answers ) 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. ( Correct answers ) 2T
A pressure test is always required: ( Correct answers ) whenever the
authorized inspector believes one is necessary
When can radiography not be used to qualify a welder? ( Correct answers )
when using the GMAW process with the short circuit mode
Generally, raised face flanges should have a surface finish of: ( Correct
answers ) 125- 250 micro- inches
During a direct visual exam of a pipe weld, the minimum light intensity
should be: ( Correct answers ) 100 footcandles
Describe the 3G welding test position. ( Correct answers ) Vertical
groove Weld Seal welding pipe threads: ( Correct answers ) may be
used to prevent leaks
Liquid thermal relief valves should be set at a pressure not higher
than: ( Correct answers ) 120 %
When fabricating pipe, unknown materials: ( Correct answers ) Should
never be used (except for door stops)
The material verification program specified by API 578 covers: ( Correct
answers ) only pressure containing components.
what is the interval for thickness measurements on a class 1 piping
system?
GRADED ( Correct answers ) lesser of 5 years or half life of the pipe
A+
EXAM WITH CORRECT
ANSWERS 2025
Pressure applied inside a pipe creates stress in the pipe wall. These
stresses are highest on which weld orientation? ( Correct answers )
longitudinal weld
Per B31.3, how much RT is conducted on circumferential welds of a pipe
in normal service? ( Correct answers ) 10%
for welded pipe, the normal thickness of under-tolerance is? ( Correct
answers ) .010 or 10 mils
The corrosiveness of soils can be determined by measuring the soils:
( Correct answers
) Resistivity
when qualifying a weld procedure the essential variables must: ( Correct
answers ) be recorded on both the WPS & PQR
In severe refinery services which type of pipe is normally used? ( Correct
answers ) seamless pipe
a pipe has a thickness designation of "40S". what does the "S" mean?
( Correct answers ) Stainless steel
Generally socket-welded pipe is not used for nominal pipe sizes above:
( Correct answers ) 2 inches
A propane piping system should be classified as? ( Correct answers )
Class 1
According to ASME/ANSI B16.5 flanges from plate materials can only be
used for: ( Correct answers ) Blind flanges
Preheat should never be substituted for PWHT if: ( Correct answers ) the
PWHT was used to prevent environmental cracking.
During welding, non-esential variables: ( Correct answers ) Must be
recorded only on the WPS and must be followed by the welder.
During a hydrotest, all joints should be: ( Correct answers ) left
uninsulated
GRADED
ASME/ANSI
A+ B16.5 requires flanges to be: ( Correct answers ) marked with
the class rating.
, Graphitization of carbon steels begins to occur when metal
temperatures exceed: ( Correct answers ) 800°F
During pipe fabrication who has overall responsibility for compliance with
the code? ( Correct answers ) The owner/user
Who has the responsibility to determine the extent of PMI
(Positive Material Identification) performed? ( Correct answers )
The owner/user
An inservice process pipe should be classified as Class 1 when the % of H2S
exceeds: ( Correct answers ) 3%
A welder becomes unqualified when he has not welded in: ( Correct
answers ) 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. ( Correct answers ) 2T
A pressure test is always required: ( Correct answers ) whenever the
authorized inspector believes one is necessary
When can radiography not be used to qualify a welder? ( Correct answers )
when using the GMAW process with the short circuit mode
Generally, raised face flanges should have a surface finish of: ( Correct
answers ) 125- 250 micro- inches
During a direct visual exam of a pipe weld, the minimum light intensity
should be: ( Correct answers ) 100 footcandles
Describe the 3G welding test position. ( Correct answers ) Vertical
groove Weld Seal welding pipe threads: ( Correct answers ) may be
used to prevent leaks
Liquid thermal relief valves should be set at a pressure not higher
than: ( Correct answers ) 120 %
When fabricating pipe, unknown materials: ( Correct answers ) Should
never be used (except for door stops)
The material verification program specified by API 578 covers: ( Correct
answers ) only pressure containing components.
what is the interval for thickness measurements on a class 1 piping
system?
GRADED ( Correct answers ) lesser of 5 years or half life of the pipe
A+
