Elbow manufacturers summarize the performance comparison of national standard 90 degree elbows

In piping systems, 90-degree elbows are fittings that change the direction of a pipe. They are one of the most commonly used elbow fittings in pipeline engineering, accounting for approximately 80% of all elbows. 90-degree elbows are made from materials such as cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals, and plastics. National standard 90-degree elbows are those produced according to national standards, including GB12459 "Steel Butt-Weld Seamless Pipe Fittings," GB/T14383 "Forged Steel Socket-Weld Pipe Fittings," GB/T14626 "Forged Steel Threaded Pipe Fittings," and GB/T13401 "Steel Plate Butt-Weld Pipe Fittings." Different forming processes are typically used for 90-degree elbows made of different materials and wall thicknesses.

90-degree elbows can be connected to pipes through direct welding (the most common method), flange connections, thermal fusion, electric fusion, threaded connections, and socket connections. Based on the production process, elbows can be categorized as welded, stamped, pushed, cast, and butt-welded. National standard 90-degree elbows have the following characteristics:

1. They are heat-resistant and pressure-resistant, with excellent flexibility and heat resistance, surpassing other plastic pipes. They are easy to install, have good thermal conductivity, and are suitable for floor heating systems. They are also recyclable.

2. PP national standard stamped elbows offer excellent impact strength, can be heat-welded, and mechanically joined, and have superior thermal conductivity to PB and PP-R.

90-degree elbow manufacturers summarize the performance comparison of national standard 90-degree elbows:

1. Long-term pressure resistance: Based solely on design stress, national standard 90-degree elbows offer the best pressure resistance. However, due to various factors, the actual wall thickness of floor heating pipes is typically 2mm. At this wall thickness, all types of pipe can meet the requirements of floor heating, and the pressure-resistant advantages of national standard 90-degree elbow pipes are not fully realized.

2. Thermal Conductivity: Pipes used for floor heating require good thermal conductivity.

3. Low-Temperature Thermal Shock Resistance: PE-RT and PEX offer superior low-temperature shock resistance. During winter construction, pipes are less susceptible to impact and breakage, increasing construction flexibility.

4. Environmental Protection: PE-RT is recyclable and environmentally friendly. PEX, on the other hand, cannot be recycled and can cause secondary pollution.

5. Processing Stability: PEX has issues controlling cross-linking degree and uniformity, making processing complex and directly impacting pipe performance.

Development Trends of National Standard 90-Degree Elbow Pipes:

National Standard 90-Degree Elbow raw materials not only have qualified creep rupture curves, but are also reasonably priced and convenient and quicker to install than other pipe types. The national standard 90-degree elbow connection is currently the most reliable form of localized hot-melt fusion. The bore diameter of the fitting is larger than the inner diameter of pipes of the same specification. Because there is no mechanical connection that would cause localized reduction, the system fluid resistance is relatively low.

Cangzhou Aosendic Pipe Fittings Manufacturing Co., Ltd. is a large-scale manufacturer specializing in elbows, tees, reducers, elbows, and caps. We comply with ASTM, ANSI, JIS, DIN, GB, and other standards, covering virtually all types of steel.

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