hammer union | Energy Glossary

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hammer union

1. n. [Drilling, Production Testing, Well Completions, Well Testing, Well Workover and Intervention]

A connection common in the oil industry consisting of two joints coupled by a threaded nut. Protrusions on the nut are hit with a sledgehammer to tighten the connection and energize the seals. Hammer unions are commonly used on treating iron because of their ability to be quickly made up or broken down.

See related terms: make a connection