Forged Swage Nipple
The Forged Swage Nipple (also called a swaged nipple or reducing nipple) is a one-piece forged fitting used to reduce the bore of a pipe run from a larger size to a smaller size in a straight configuration. The fitting body tapers between the two different pipe diameters, with the large end having the outside diameter of the larger pipe and the small end having the outside diameter of the smaller pipe.
Swage nipples are supplied in two geometric types. The concentric swage nipple has both pipe axes on the same centreline, providing a symmetric bore reduction used in standard vertical and horizontal runs. The eccentric swage nipple has both pipe axes offset so that one side of the fitting body is flat along its full length, used in horizontal liquid pipe runs to prevent liquid accumulation and aid drainage at the reduction point.
End connections are available in four combinations: both ends plain (BW-BW) for butt-welding into the pipeline; large end plain and small end male NPT threaded (BW-THD); large end male NPT and small end male NPT (THD-THD); or large end plain and small end plain with male NPT thread on one end only. Cunimet Alloy International manufactures swage nipples by closed-die forging from a single billet, ensuring a continuous, dense grain structure through the taper body.