API 570 Study Guide (Full) QUESTIONS AND
COMPLETE SOLUTIONS
Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on which weld
orientation? - Correct Answer longitudinal weld
Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service? - Correct
Answer 10%
for welded pipe, the normal thickness of under-tolerance is? - Correct Answer .010 or 10 mils
The corrosiveness of soils can be determined by measuring the soils: - Correct Answer Resistivity
when qualifying a weld procedure the essential variables must: - Correct Answer be recorded on both
the WPS & PQR
In severe refinery services which type of pipe is normally used? - Correct Answer seamless pipe
a pipe has a thickness designation of "40S". what does the "S" mean? - Correct Answer Stainless steel
Generally socket-welded pipe is not used for nominal pipe sizes above: - Correct Answer 2 inches
A propane piping system should be classified as? - Correct Answer Class 1
According to ASME/ANSI B16.5 flanges from plate materials can only be used for: - Correct Answer Blind
flanges
Preheat should never be substituted for PWHT if: - Correct Answer the PWHT was used to prevent
environmental cracking.
,During welding, non-esential variables: - Correct Answer Must be recorded only on the WPS and must
be followed by the welder.
During a hydrotest, all joints should be: - Correct Answer left uninsulated
ASME/ANSI B16.5 requires flanges to be: - Correct Answer marked with the class rating.
Graphitization of carbon steels begins to occur when metal temperatures exceed: - Correct Answer
800°F
During pipe fabrication who has overall responsibility for compliance with the code? - Correct Answer
The owner/user
Who has the responsibility to determine the extent of PMI (Positive Material Identification) performed? -
Correct Answer The owner/user
An inservice process pipe should be classified as Class 1 when the % of H2S exceeds: - Correct Answer
3%
A welder becomes unqualified when he has not welded in: - Correct 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. - Correct Answer 2T
A pressure test is always required: - Correct Answer whenever the authorized inspector believes one is
necessary
When can radiography not be used to qualify a welder? - Correct Answer when using the GMAW
process with the short circuit mode
Generally, raised face flanges should have a surface finish of: - Correct Answer 125-250 micro- inches
, During a direct visual exam of a pipe weld, the minimum light intensity should be: - Correct Answer 100
footcandles
Describe the 3G welding test position. - Correct Answer Vertical groove Weld
Seal welding pipe threads: - Correct Answer may be used to prevent leaks
Liquid thermal relief valves should be set at a pressure not higher than: - Correct Answer 120 %
When fabricating pipe, unknown materials: - Correct Answer Should never be used (except for door
stops)
The material verification program specified by API 578 covers: - Correct Answer only pressure
containing components.
what is the interval for thickness measurements on a class 1 piping system? - Correct Answer lesser of 5
years or half life of the pipe
According to B31.3, a welder's qualification records from a previous employer can: - Correct Answer Be
accepted if the inspector approves
When welding together piping components of different thicknesses, the thicker part should be trimmed
with a: - Correct Answer 30 degree taper.
When performing soil-to air inspections on uncoated lines, it is recommended to excavate the soil: -
Correct Answer 6-12 inches.
When performing preheat prior to welding or PWHT, the preheat zone and/or PWHT must extend how
far beyond the edge of the weld? - Correct Answer 1 inch
Flange bolts are unacceptable if the bolt threads do not extend: - Correct Answer inside the nut within
1 thread of the nut face
COMPLETE SOLUTIONS
Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on which weld
orientation? - Correct Answer longitudinal weld
Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service? - Correct
Answer 10%
for welded pipe, the normal thickness of under-tolerance is? - Correct Answer .010 or 10 mils
The corrosiveness of soils can be determined by measuring the soils: - Correct Answer Resistivity
when qualifying a weld procedure the essential variables must: - Correct Answer be recorded on both
the WPS & PQR
In severe refinery services which type of pipe is normally used? - Correct Answer seamless pipe
a pipe has a thickness designation of "40S". what does the "S" mean? - Correct Answer Stainless steel
Generally socket-welded pipe is not used for nominal pipe sizes above: - Correct Answer 2 inches
A propane piping system should be classified as? - Correct Answer Class 1
According to ASME/ANSI B16.5 flanges from plate materials can only be used for: - Correct Answer Blind
flanges
Preheat should never be substituted for PWHT if: - Correct Answer the PWHT was used to prevent
environmental cracking.
,During welding, non-esential variables: - Correct Answer Must be recorded only on the WPS and must
be followed by the welder.
During a hydrotest, all joints should be: - Correct Answer left uninsulated
ASME/ANSI B16.5 requires flanges to be: - Correct Answer marked with the class rating.
Graphitization of carbon steels begins to occur when metal temperatures exceed: - Correct Answer
800°F
During pipe fabrication who has overall responsibility for compliance with the code? - Correct Answer
The owner/user
Who has the responsibility to determine the extent of PMI (Positive Material Identification) performed? -
Correct Answer The owner/user
An inservice process pipe should be classified as Class 1 when the % of H2S exceeds: - Correct Answer
3%
A welder becomes unqualified when he has not welded in: - Correct 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. - Correct Answer 2T
A pressure test is always required: - Correct Answer whenever the authorized inspector believes one is
necessary
When can radiography not be used to qualify a welder? - Correct Answer when using the GMAW
process with the short circuit mode
Generally, raised face flanges should have a surface finish of: - Correct Answer 125-250 micro- inches
, During a direct visual exam of a pipe weld, the minimum light intensity should be: - Correct Answer 100
footcandles
Describe the 3G welding test position. - Correct Answer Vertical groove Weld
Seal welding pipe threads: - Correct Answer may be used to prevent leaks
Liquid thermal relief valves should be set at a pressure not higher than: - Correct Answer 120 %
When fabricating pipe, unknown materials: - Correct Answer Should never be used (except for door
stops)
The material verification program specified by API 578 covers: - Correct Answer only pressure
containing components.
what is the interval for thickness measurements on a class 1 piping system? - Correct Answer lesser of 5
years or half life of the pipe
According to B31.3, a welder's qualification records from a previous employer can: - Correct Answer Be
accepted if the inspector approves
When welding together piping components of different thicknesses, the thicker part should be trimmed
with a: - Correct Answer 30 degree taper.
When performing soil-to air inspections on uncoated lines, it is recommended to excavate the soil: -
Correct Answer 6-12 inches.
When performing preheat prior to welding or PWHT, the preheat zone and/or PWHT must extend how
far beyond the edge of the weld? - Correct Answer 1 inch
Flange bolts are unacceptable if the bolt threads do not extend: - Correct Answer inside the nut within
1 thread of the nut face
