N2 Fitting and Machining Theory|Hands-On! 101


• Soldered or brazed: Tis method of joining two pipes is usually done by using a collar into which both pipe ends are fed, from opposite ends. Te pipe ends are covered with a layer of solder and flux. Te ends are heated until the solder melts, then slid half way in. Solder can be added when the pipe is partially or fully in the joint. Most commonly used on copper pipes.


• Screwed (threaded) joint: Te most common method of joining steel pipes is by screwing them together. Tis is quick and easy.


• Flanged joint: Larger pipe lines make regular use of flanged joints (see Figure 8.3). A gasket is usually placed between the two flange faces as this greatly improves the joint sealing ability. flange


seal bolt & nut


Figure 8.3 8.4 Plastic water pipes


Butt-and-strap joint Tis method of joining two pipes together is quite common on plastic pipes. Te two pipe ends are coated with adhesive. Both pipe ends then slide into a neatly fitting sleeve, one from each end. Once in position the pipe ends are end to end or butting up against each other. Te joint is leſt to cure for a few hours and is then ready for use.


Welded plastic pipe joint


Te two pieces to be welded together are butted up against each other. Sufficient heat is then applied to cause fusion to take place. Both parts must be at least 2,5 mm in thickness. Te heat is supplied by either hot gas or a heated tool, only two of numerous methods available. Tis works best on thermoplastics. If done properly the joint will be permanent and reliable.


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