Fittings

Fire sprinkler piping systems rely on grooved and threaded fittings for assembly, each suited to specific applications. Grooved fittings are used primarily on larger-diameter steel pipe. Each fitting uses a formed groove near the end of the fitting. A groove is also formed on the pipe end using a roll or cut grooving machine, and a rubber gasket is positioned over the ends. A metal coupling housing encases the gasket and is secured with bolts, creating a flexible, leak-resistant joint that allows for easier installation, expansion, and maintenance. Threaded fittings, by contrast, are common on smaller pipe, typically 2 inches and below. Pipe ends are threaded using a threading machine equipped with cutting dies, producing tapered threads that mate tightly with threaded fittings. Thread sealant is applied to ensure a leak-free connection.

The machines supporting these methods are essential to field and shop work. Grooving machines press or cut a circular groove into the pipe wall, while threading machines rotate the pipe against lubricated dies to form precise threads. In addition, welding machines are sometimes used to create permanent joints, attach outlets, or fabricate spools in shops. Together, these methods provide reliable connection systems that balance strength, speed, and flexibility.