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API 570 - Study Guide Questions and Answers 100% Pass
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API 570 - Study Guide Questions and Answers 100% Pass Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on which weld orientation? - ANSWER-longitudinal weld Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service? - ANS...

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  • November 3, 2024
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  • 2024/2025
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Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024




API 570 - Study Guide Questions and

Answers 100% Pass


Pressure applied inside a pipe creates stress in the pipe wall. These stresses are highest on which weld

orientation? - ANSWER✔✔-longitudinal weld


Per B31.3, how much RT is conducted on circumferential welds of a pipe in normal service? -

ANSWER✔✔-10%


for welded pipe, the normal thickness of mill-under-tolerance is? - ANSWER✔✔-.010 or 10 mils


The corrosiveness of soils can be determined by measuring the soils: - ANSWER✔✔-Resistivity


when qualifying a weld procedure the essential variables must: - ANSWER✔✔-be recorded on both the

WPS & PQR


In severe refinery services which type of pipe is normally used? - ANSWER✔✔-seamless pipe


a pipe has a thickness designation of "40S". what does the "S" mean? - ANSWER✔✔-Stainless steel


Generally socket-welded pipe is not used for nominal pipe sizes above: - ANSWER✔✔-2 inches


A propane piping system should be classified as? - ANSWER✔✔-Class 1


According to ASME/ANSI B16.5, flanges from plate materials can only be used for: - ANSWER✔✔-Blind

flanges




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,Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024


When should Preheat never be substituted for PWHT if: - ANSWER✔✔-When the PWHT was used to

prevent environmental cracking.


During welding, non-esential variables: - ANSWER✔✔-Must be recorded only on the WPS and must be

followed by the welder.


During a hydrotest, all joints should be: - ANSWER✔✔-left uninsulated


ASME/ANSI B16.5 requires flanges to be arked with: - ANSWER✔✔-marked with the class rating.


Graphitization of carbon steels begins to occur when metal temperatures exceed: - ANSWER✔✔-800°F


An inservice process pipe should be classified as Class 1 when the % of H2S exceeds: - ANSWER✔✔-3%


A welder becomes unqualified when he has not welded in: - 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. - ANSWER✔✔-2T


A pressure test is always required: - ANSWER✔✔-whenever the authorized inspector believes one is

necessary


When can radiography not be used to qualify a welder? - ANSWER✔✔-when using the GMAW process

with the short circuit mode


Generally, raised face flanges should have a surface finish of: - ANSWER✔✔-125-250 micro- inches


During a direct visual exam of a pipe weld, the minimum light intensity should be: - ANSWER✔✔-100

footcandles


Describe the 3G welding test position. - ANSWER✔✔-Vertical groove Weld



Copyright ©Stuvia International BV 2010-2024 Page 2/16

, Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024


Seal welding pipe threads: - ANSWER✔✔-may be used to prevent leaks


Liquid thermal relief valves should be set at a pressure not higher than: - ANSWER✔✔-120 %


When fabricating pipe, unknown materials: - ANSWER✔✔-Should never be used (except for door stops)


The material verification program specified by API 578 applies to: - ANSWER✔✔-only pressure

containing components.


what is the interval for thickness measurements on a class 1 piping system? - 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: - ANSWER✔✔-Be

accepted if the inspector approves


When welding together piping components of different thicknesses, the thicker part should be trimmed

with a: - ANSWER✔✔-30 degree taper.


When performing soil-to air inspections on uncoated lines, it is recommended to excavate the soil: -

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? - ANSWER✔✔-1 inch


Flange bolts are unacceptable if the bolt threads do not extend: - ANSWER✔✔-inside the nut within 1

thread of the nut face


Carbon steel materials are most likely to be incorrectly substituted in: - ANSWER✔✔-a chrome steel

piping system.




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