In piping, a nipple is a fitting, consisting of a short piece of pipe, usually provided with a male pipe thread at each end, for connecting two other female threaded fittings or pipes. Pipe Nipples are commonly used as adapters from one connection type to another. Pipe nipples are mainly used in low-pressure piping systems.
Pipe nipples are manufactured by cutting a specified length of pipe and applying the desired end connections. The pipe nipple dimensions and material follow from pipe specifications. Similar to pipe, pipe nipples also come in either a seamless or welded construction.
When ordering pipe nipples, the following properties must be specified:
Diameter – Length – Schedule – Material – End Connections
The length of pipe nipple is usually specified by the overall length including threads. Pipe Nipples can come in any specified length, but most commonly range between close to 12”. A close pipe nipple is the shortest piece of pipe necessary to allow for fully threaded end connections, where there is no smooth surface between threads
A Plain Both Ends (PBE) pipe nipple, has both the ends as plain ends, with no thread, typically used to fit a socket weld connection.
A Threaded Both Ends (TBE) pipe nipple has both the ends as threaded ends and used to fit female threaded connections.
Grooved Pipe Nipples
Grooved pipe nipples are commonly used in commercial or industrial construction, mining, and process piping applications. There are three common configurations Groove x Groove, Groove x Bevel and Groove x Thread.