AL Oil Gas Fields Practice Questions - Alabama Oil And Gas Fields Contractor Examination Exam

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During field erection of an API 650 tank shell, which welding sequence practice best controls shell out-of-roundness and residual stress?

Weld only vertical seams and leave all horizontal seams open permanently Use a planned sequence of vertical and horizontal shell seams with fit-up control and progressive alignment checks Skip fit-up and rely only on final hydrotest to reshape the shell Weld the entire tank from the top course downward with no intermediate checks

Correct Answer:

Use a planned sequence of vertical and horizontal shell seams with fit-up control and progressive alignment checks

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