©JOSHCLAY 2024/2025 YEAR PUBLISHED, 2024
API 570 - Study Guide Exam Questions
and Answers 100% Solved
Pressure applied inside a pipe creates stress in the pipe wall. These
stresses are highest on which weld orientation? - ✔✔longitudinal weld
Per B31.3, how much RT is conducted on circumferential welds of a pipe in
normal service? - ✔✔10%
for welded pipe, the normal thickness of mill-under-tolerance is? - ✔✔.010
or 10 mils
The corrosiveness of soils can be determined by measuring the soils: -
✔✔Resistivity
when qualifying a weld procedure the essential variables must: - ✔✔be
recorded on both the WPS & PQR
In severe refinery services which type of pipe is normally used? -
✔✔seamless pipe
a pipe has a thickness designation of "40S". what does the "S" mean? -
✔✔Stainless steel
,©JOSHCLAY 2024/2025 YEAR PUBLISHED, 2024
Generally socket-welded pipe is not used for nominal pipe sizes above: -
✔✔2 inches
A propane piping system should be classified as? - ✔✔Class 1
According to ASME/ANSI B16.5, flanges from plate materials can only be
used for: - ✔✔Blind flanges
When should Preheat never be substituted for PWHT if: - ✔✔When the
PWHT was used to prevent environmental cracking.
During welding, non-esential variables: - ✔✔Must be recorded only on the
WPS and must be followed by the welder.
During a hydrotest, all joints should be: - ✔✔left uninsulated
ASME/ANSI B16.5 requires flanges to be arked with: - ✔✔marked with the
class rating.
Graphitization of carbon steels begins to occur when metal temperatures
exceed: - ✔✔800°F
An inservice process pipe should be classified as Class 1 when the % of
H2S exceeds: - ✔✔3%
A welder becomes unqualified when he has not welded in: - ✔✔6 months
, ©JOSHCLAY 2024/2025 YEAR PUBLISHED, 2024
A PQR test coupon with a shell thickness of "T" can generally be used to
qualify a wall thickness on the WPS up to. - ✔✔2T
A pressure test is always required: - ✔✔whenever the authorized inspector
believes one is necessary
When can radiography not be used to qualify a welder? - ✔✔when using
the GMAW process with the short circuit mode
Generally, raised face flanges should have a surface finish of: - ✔✔125-
250 micro- inches
During a direct visual exam of a pipe weld, the minimum light intensity
should be: - ✔✔100 footcandles
Describe the 3G welding test position. - ✔✔Vertical groove Weld
Seal welding pipe threads: - ✔✔may be used to prevent leaks
Liquid thermal relief valves should be set at a pressure not higher than: -
✔✔120 %
When fabricating pipe, unknown materials: - ✔✔Should never be used
(except for door stops)
API 570 - Study Guide Exam Questions
and Answers 100% Solved
Pressure applied inside a pipe creates stress in the pipe wall. These
stresses are highest on which weld orientation? - ✔✔longitudinal weld
Per B31.3, how much RT is conducted on circumferential welds of a pipe in
normal service? - ✔✔10%
for welded pipe, the normal thickness of mill-under-tolerance is? - ✔✔.010
or 10 mils
The corrosiveness of soils can be determined by measuring the soils: -
✔✔Resistivity
when qualifying a weld procedure the essential variables must: - ✔✔be
recorded on both the WPS & PQR
In severe refinery services which type of pipe is normally used? -
✔✔seamless pipe
a pipe has a thickness designation of "40S". what does the "S" mean? -
✔✔Stainless steel
,©JOSHCLAY 2024/2025 YEAR PUBLISHED, 2024
Generally socket-welded pipe is not used for nominal pipe sizes above: -
✔✔2 inches
A propane piping system should be classified as? - ✔✔Class 1
According to ASME/ANSI B16.5, flanges from plate materials can only be
used for: - ✔✔Blind flanges
When should Preheat never be substituted for PWHT if: - ✔✔When the
PWHT was used to prevent environmental cracking.
During welding, non-esential variables: - ✔✔Must be recorded only on the
WPS and must be followed by the welder.
During a hydrotest, all joints should be: - ✔✔left uninsulated
ASME/ANSI B16.5 requires flanges to be arked with: - ✔✔marked with the
class rating.
Graphitization of carbon steels begins to occur when metal temperatures
exceed: - ✔✔800°F
An inservice process pipe should be classified as Class 1 when the % of
H2S exceeds: - ✔✔3%
A welder becomes unqualified when he has not welded in: - ✔✔6 months
, ©JOSHCLAY 2024/2025 YEAR PUBLISHED, 2024
A PQR test coupon with a shell thickness of "T" can generally be used to
qualify a wall thickness on the WPS up to. - ✔✔2T
A pressure test is always required: - ✔✔whenever the authorized inspector
believes one is necessary
When can radiography not be used to qualify a welder? - ✔✔when using
the GMAW process with the short circuit mode
Generally, raised face flanges should have a surface finish of: - ✔✔125-
250 micro- inches
During a direct visual exam of a pipe weld, the minimum light intensity
should be: - ✔✔100 footcandles
Describe the 3G welding test position. - ✔✔Vertical groove Weld
Seal welding pipe threads: - ✔✔may be used to prevent leaks
Liquid thermal relief valves should be set at a pressure not higher than: -
✔✔120 %
When fabricating pipe, unknown materials: - ✔✔Should never be used
(except for door stops)
