SC Boiler Installation Practice Questions - South Carolina Boiler Installation Contractor Examination Exam

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Compared with an open-root butt joint, a backing-ring (chill-ring) pipe weld is characterized by which of the following?

No root gap and no filler in the root A metal ring fitted to the inside of the joint so the root pass can be deposited against a backing, at the cost of a flow restriction and a crevice A consumable insert that is prohibited on all steam pipe A process that never requires a qualified WPS

Correct Answer:

A metal ring fitted to the inside of the joint so the root pass can be deposited against a backing, at the cost of a flow restriction and a crevice

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