The need for an expansion gap in the fitting precludes their use in high-pressure food applications. Socket fittings are welded into place with fillet welds, which makes them weaker than butt- welded fittings, but still preferable to threaded fittings for high-end work. Socket-weld fittings, usually forged, are restricted to smaller pipe diameters (up to NPS 4, but usually NPS 2 or smaller) and are available in 3000, 6000, and 9000 class pressure ratings, corresponding to Schedule 40, 80, and 160 pipe. As sizes and pressures increase, they are often welded in place by either butt-weld or socket-weld methods. In smaller sizes they are often threaded to match threads on the ends of pipe. Steel pipe fittings are often extruded or drawn over a mandrel from welded or seamless pipe. Although standards list threaded fittings up to fairly large diameters, these generally are not used today as the threading of large-diameter pipe is considered needlessly difficult. While there are both malleable iron pipe fittings and ductile iron pipe fittings available, the improved mechanical properties and lower cost of ductile iron is causing a shift towards greater use of that material.įittings for steel (aka, “black pipe”) and galvanized pipe as found in residential and commercial plumbing work are generally cast and referred to as “malleable iron fittings." They can be galvanized. Mechanical compression flange fittings for iron pipe are often used Flanged joints employed in underground applications can subject the pipe to settlement stresses unless the pipe is adequately supported. Cast iron pipe is sometimes joined with bolted flanges, or in some cases, mechanical compression connections. Older systems before the 1950s were caulked using a combination of molten lead and a fibrous material such as oakum. Bell-and-spigot, or sometimes, hub-and-spigot, fittings are joined today primarily with elastomeric gaskets that fit inside the bell and accommodate the insertion of the plain pipe end or fitting. These hubless or no hub designs are sometimes referred to as rubber pipe couplings or rubber plumbing couplings and are especially popular for transitioning from one material to another-from copper to cast iron, for instance. 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. We can produce stainless steel products of national standard, European standard, American Standard and Japanese standard, etc.Pipe Fittings Explained: Fitting Materials and Manufacturing Processes Cast and malleable ironįittings for cast iron pipe fall under hubless and bell-and-spigot styles. At present, we have obtained the product standard certification from Hong Kong, Europe, Australia and other places. The quality of our products has been recognized by many customers. Each finished product has traceability source, which can be traced back to the source of raw materials, and the quality assurance is guaranteed.Our stainless steel products are exported to Southeast Asia, Africa, Europe, America and other parts of the world. The whole production process from raw materials into the factory to Coil Slitting, pipe making and pipe fitting is completed in the factory, and there are strict quality inspection means. All raw materials of stainless steel products are raw materials from three major domestic steel plants, and they are subject to strict quality inspection. At present, Mayer is the only manufacturer in China that can independently control all links and processes of stainless steel pipe making. We have participated in many large projects and cooperated with the government and many large enterprises. It is a benchmark brand in China's stainless steel water pipe industry. It is listed on the main board of Hong Kong, China (Stock Code: 01116. has been specializing in the production of stainless steel water pipes for 26 years.
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