SC Pressure And Process Piping Practice Questions - South Carolina Pressure And Process Piping Contractor Examination Exam

What bolt-tightening pattern is used to make up a raised-face flange evenly?

Tighten adjacent bolts in a circle, one after another, to full torque on the first pass A star or crisscross pattern, in staged passes (for example 30%, 60%, then 100% of target torque or tension) Tighten only the top two bolts and leave the rest finger-tight Use an impact wrench on one bolt until the gasket extrudes

Correct Answer:

A star or crisscross pattern, in staged passes (for example 30%, 60%, then 100% of target torque or tension)

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