API 570 Study Guide (Full) Exam
Questions with Complete Solutions19
Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on
which weld orientation? - ANSWERS-longitudinal weld
Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service? -
ANSWERS-10%
for welded pipe, the normal thickness of under-tolerance is? - ANSWERS-.010 or 10 mils
The corrosiveness of soils can be determined by measuring the soils: - ANSWERS-Resistivity
when qualifying a weld procedure the essential variables must: - ANSWERS-be recorded on both
the WPS & PQR
In severe refinery services which type of pipe is normally used? - ANSWERS-seamless pipe
a pipe has a thickness designation of "40S". what does the "S" mean? - ANSWERS-Stainless steel
Generally socket-welded pipe is not used for nominal pipe sizes above: - ANSWERS-2 inches
A propane piping system should be classified as? - ANSWERS-Class 1
According to ASME/ANSI B16.5 flanges from plate materials can only be used for: - ANSWERS-
Blind flanges
,Preheat should never be substituted for PWHT if: - ANSWERS-the PWHT was used to prevent
environmental cracking.
During welding, non-esential variables: - ANSWERS-Must be recorded only on the WPS and
must be followed by the welder.
During a hydrotest, all joints should be: - ANSWERS-left uninsulated
ASME/ANSI B16.5 requires flanges to be: - ANSWERS-marked with the class rating.
Graphitization of carbon steels begins to occur when metal temperatures exceed: - ANSWERS-
800°F
During pipe fabrication who has overall responsibility for compliance with the code? -
ANSWERS-The owner/user
Who has the responsibility to determine the extent of PMI (Positive Material Identification)
performed? - ANSWERS-The owner/user
An inservice process pipe should be classified as Class 1 when the % of H2S exceeds: -
ANSWERS-3%
A welder becomes unqualified when he has not welded in: - 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. - ANSWERS-2T
, A pressure test is always required: - ANSWERS-whenever the authorized inspector believes one
is necessary
When can radiography not be used to qualify a welder? - ANSWERS-when using the GMAW
process with the short circuit mode
Generally, raised face flanges should have a surface finish of: - ANSWERS-125-250 micro- inches
During a direct visual exam of a pipe weld, the minimum light intensity should be: - ANSWERS-
100 footcandles
Describe the 3G welding test position. - ANSWERS-Vertical groove Weld
Seal welding pipe threads: - ANSWERS-may be used to prevent leaks
Liquid thermal relief valves should be set at a pressure not higher than: - ANSWERS-120 %
When fabricating pipe, unknown materials: - ANSWERS-Should never be used (except for door
stops)
The material verification program specified by API 578 covers: - ANSWERS-only pressure
containing components.
what is the interval for thickness measurements on a class 1 piping system? - ANSWERS-lesser
of 5 years or half life of the pipe
According to B31.3, a welder's qualification records from a previous employer can: - ANSWERS-
Be accepted if the inspector approves
Questions with Complete Solutions19
Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on
which weld orientation? - ANSWERS-longitudinal weld
Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service? -
ANSWERS-10%
for welded pipe, the normal thickness of under-tolerance is? - ANSWERS-.010 or 10 mils
The corrosiveness of soils can be determined by measuring the soils: - ANSWERS-Resistivity
when qualifying a weld procedure the essential variables must: - ANSWERS-be recorded on both
the WPS & PQR
In severe refinery services which type of pipe is normally used? - ANSWERS-seamless pipe
a pipe has a thickness designation of "40S". what does the "S" mean? - ANSWERS-Stainless steel
Generally socket-welded pipe is not used for nominal pipe sizes above: - ANSWERS-2 inches
A propane piping system should be classified as? - ANSWERS-Class 1
According to ASME/ANSI B16.5 flanges from plate materials can only be used for: - ANSWERS-
Blind flanges
,Preheat should never be substituted for PWHT if: - ANSWERS-the PWHT was used to prevent
environmental cracking.
During welding, non-esential variables: - ANSWERS-Must be recorded only on the WPS and
must be followed by the welder.
During a hydrotest, all joints should be: - ANSWERS-left uninsulated
ASME/ANSI B16.5 requires flanges to be: - ANSWERS-marked with the class rating.
Graphitization of carbon steels begins to occur when metal temperatures exceed: - ANSWERS-
800°F
During pipe fabrication who has overall responsibility for compliance with the code? -
ANSWERS-The owner/user
Who has the responsibility to determine the extent of PMI (Positive Material Identification)
performed? - ANSWERS-The owner/user
An inservice process pipe should be classified as Class 1 when the % of H2S exceeds: -
ANSWERS-3%
A welder becomes unqualified when he has not welded in: - 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. - ANSWERS-2T
, A pressure test is always required: - ANSWERS-whenever the authorized inspector believes one
is necessary
When can radiography not be used to qualify a welder? - ANSWERS-when using the GMAW
process with the short circuit mode
Generally, raised face flanges should have a surface finish of: - ANSWERS-125-250 micro- inches
During a direct visual exam of a pipe weld, the minimum light intensity should be: - ANSWERS-
100 footcandles
Describe the 3G welding test position. - ANSWERS-Vertical groove Weld
Seal welding pipe threads: - ANSWERS-may be used to prevent leaks
Liquid thermal relief valves should be set at a pressure not higher than: - ANSWERS-120 %
When fabricating pipe, unknown materials: - ANSWERS-Should never be used (except for door
stops)
The material verification program specified by API 578 covers: - ANSWERS-only pressure
containing components.
what is the interval for thickness measurements on a class 1 piping system? - ANSWERS-lesser
of 5 years or half life of the pipe
According to B31.3, a welder's qualification records from a previous employer can: - ANSWERS-
Be accepted if the inspector approves
