What is a union in pipefitting?

• A. A fitting that allows for two pipes to be permanently joined
• B. A fitting that allows for two pipes to be joined and also made to be easily disconnected
• C. A type of pipe joint used for sealing
• D. A method of insulating pipes

Answer: (B)

A union in pipefitting is a specific type of fitting designed to connect two sections of pipe while allowing them to be easily disconnected. This is particularly useful in situations where maintenance or repairs may be required, as it provides a simple means of removing one section of pipe without cutting it. Typically, unions have threads on both ends, which can be tightened or loosened by hand or with a wrench.

The ability to easily disassemble joints is essential in various industries, where it’s important to maintain and service piping systems without extensive labor. This characteristic distinguishes unions from other fittings that create permanent connections, making them invaluable in expanding or modifying existing systems.

Understanding the role and functionality of unions allows pipefitters to make informed decisions when designing and constructing piping systems, particularly in ensuring accessibility for future maintenance.