API 570 - Study Guide UPDATED ACTUAL Questions and CORRECT Answers
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Course
API 510
Institution
API 510
API 570 - Study Guide UPDATED
ACTUAL Questions and CORRECT
Answers
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 ...
API 570 - Study Guide UPDATED
ACTUAL Questions and CORRECT
Answers
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 mill-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
,When should Preheat never be substituted for PWHT if: - CORRECT ANSWER- ✔✔When
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 arked with: - CORRECT ANSWER- ✔✔marked
with the class rating.
Graphitization of carbon steels begins to occur when metal temperatures exceed: -
CORRECT ANSWER- ✔✔800°F
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 applies to: - 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
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