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API 570 STUDY GUIDE (FULL) QUESTIONS AND ANSWERS
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API 570 STUDY GUIDE (FULL) QUESTIONS AND ANSWERS
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API 570 STUDYGUIDE (FULL)
QUESTIONS AND
ANSWERS
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%
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
When welding together piping components of different thicknesses, the thicker part
should be trimmed with a: - Answers-30 degree taper.
When performing soil-to air inspections on uncoated lines, it is recommended to
excavate the soil: - Answers-6-12 inches.
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