Typical molded fittings are tees, 45-degree and 90-degree elbows, reducers, couplings, caps, flange adapters, stub ends, branch saddles, service saddles, and self-tapping saddle tees. S.I.B. Other PVC fittings include barbed insert designs, which are intended to be used with tubing and are pressed into the tubing and secured with band clamps. The HPF welding technology is an electric socket fusion system that joins Purad™ PVDF piping components, providing a smooth internal surface. Forough Ameli, ... Abdolhossein Hemmati-Sarapardeh, in Fundamentals of Enhanced Oil and Gas Recovery from Conventional and Unconventional Reservoirs, 2018. Elbows can turn up, … By avoiding direct contact with the heating element, IR fusion produces a cleaner weld with more repeatable and smaller bead sizes. See our Privacy Policy for more information on these technologies. Most threaded pipe fittings are designed to be right-hand threads, but there are some left-handed (LH) thread options available. The common connotation for the term fittings is associated with the ones used for metal and plastic pipes which carry fluids. Pipe fittings can be installed via weld-on or screw-on techniques. Simply put, the elbow, or ell, is used when a pipe changes direction. The material has high purity, so it will not contaminate process fluids. Plastic pipe fittings are available in both socket weld (sometimes called solvent weld) and threaded styles, with the former the most common. About the only special requirement is that the pipe must be backed out of the fitting slightly to allow for expansion during the weld. The end result is a superior weld for high-purity applications. Roy A. Parisher, Robert A. Rhea, in Pipe Drafting and Design (Third Edition), 2012. As a result, these ring- and-cam systems seem to be quite prevalent in this industry. Examples of thermoformed fittings are sweep elbows, swaged reducers, and forged stub ends. For CPVC, solvent joining of standard socket weld fittings is the usual method of connecting the CPVC pipe fittings to the sprinkler pipe. Any leakage from these areas may drift into the emission measurement area for the mechanical seal. This is a fairly common practice for large-diameter HDPE pipeline installations. Flanges are also used, with the resulting flanged sections of pipe connected via bolts. For walls 3/4 inch thick or less, the walls are beveled to an included angle of 70° and a 3/16 inch gap is left between them. Leak-tight threaded pipe fittings can be more easily attained using anaerobic paste-type sealants rather than PTFE tape. You need to be careful when using a thin “fire blind” at an isolation valve because under pressure the thin blind will deform and the blind cannot be removed without removing the entire valve. Aluminum pipe is also a popular choice for use in creating handrails, and a host of fittings for structural applications are available, both weldable and slip on/clamp-on varieties. In limited light residential applications, cross-linked polyethylene (PEX) pipe has also been employed. Furthermore, the use of certain fittings, such as flanges, unions, or valves, may have pressure ratings that are less than that of a straight pipe of the same dimension. Fusion Improving upon conventional butt fusion, IR welding uses a noncontact method. Enquiries. The nominal dimension comes before the description. Important gaskets used are non-metallic, spiral-wound and ring-joint type (Fig. Stainless steel pipe fittings can be used for sanitary applications such as food and dairy processing, and are commonly fitted with quick-connect clamps to enable dismantling of the line for internal cleaning. Simply put, the elbow, or ell, is used when a pipe changes direction. Series A flanges are heavier and thicker than Series B for the same pressure and size. Aluminum threaded fittings such as caps or nipples are available, as are fittings that feature a combination of threaded and butt weld connection styles. Terms and Conditions, Hubless designs rely on elastomeric couplers that are secured to the outer diameters of the pipe or fitting by clamps, usually a stainless steel band clamp that compresses the elastomeric material and forms a seal. NOTE: See each manufacturer’s data for recommended joining techniques. of the fitting are primed, coated with special cement and joined together, (described in detail below.) Image credit: Yuthtana artkla/Shutterstock.com. Butt fusion is an easy, efficient fusion method especially in larger diameters.