Installation of the Eccentric Tube for a Large Reducer

   　 Large-size eccentric reducer

　　Eccentric reducers have different diameters at their two ends. These reducers are used to connect pipes with mismatched flanges or diameters. The larger end of an eccentric reducer features a slightly offset outlet, enabling it to be connected to the inlet side. This type of reducer is employed when the pipe diameter on the upstream side is larger than that on the downstream side. Eccentric reducers facilitate fluid flow and minimize disruption to the flow as the pipe diameter changes.

　　 Eccentric reducers are the most commonly used; they are frequently employed in piping systems around pumps and pipe racks.

　　Eccentric reducers are most commonly used in gas pipelines and in pipelines with vertical fluid flow. An eccentric reducer features a flat side that allows for the venting of gases or liquids, as well as for opening and securing the reducer. Consequently, eccentric reducers are typically employed in horizontally installed fluid pipelines.

　　Horizontal liquid reducers are typically eccentric, with a flat top to prevent the accumulation of air bubbles in the system. Eccentric reducers are used on the suction side of pumps to prevent air from becoming trapped in the piping. In contrast, the gradual buildup of air in concentric reducers can lead to the formation of large air pockets, causing the pump to stall or resulting in cavitation during suction. Horizontal gas reducers are usually eccentric, with a smooth bottom that allows condensate or oil to drain at the lowest point.

　　 The difference between concentric reducers and eccentric reducers

　　Concentric reducers are widely used, with eccentric reducers employed to maintain horizontal alignment between the top and bottom pipes. Eccentric reducers also help prevent air from becoming trapped in the piping, while concentric reducers can reduce noise pollution.

　　Depending on the material, pipe reducers include carbon steel reducers, stainless steel reducers, alloy steel reducers, and others.

　　Depending on their structure, pipe reducers include threaded reducers, tapered reducers, and anti‑vibration reducers, among others.

　　Horizontal liquid reducers are typically eccentric, with a flat top to prevent the accumulation of air bubbles in the system. Eccentric reducers are used on the suction side of pumps to prevent air from becoming trapped in the piping. In contrast, the gradual buildup of air in concentric reducers can lead to the formation of large air pockets, causing the pump to stall or resulting in cavitation during suction. Horizontal gas reducers are usually eccentric, with a smooth bottom that allows condensate or oil to drain at the lowest point.

　　 The difference between concentric reducers and eccentric reducers

　　Concentric reducers are widely used, with eccentric reducers employed to maintain horizontal alignment between the top and bottom pipes. Eccentric reducers also help prevent air from becoming trapped in the piping, while concentric reducers can reduce noise pollution.

　　 Manufacturing Process Flow for Steel Pipe Sizing Reduction Tubes

　　Reducers are manufactured using a variety of processes. They are fabricated from welded pipes and the required filler materials. However, EFW and ERW pipes cannot be used to produce reducers. To manufacture forged components, different methods are employed, including cold-forming and hot-forming techniques. This includes the “outer-die method.”

　　 Outer Diameter Method

　　This is the most commonly used method for manufacturing steel pipe reducers. The tube is cut and then pressed within an external die, with one end being compressed to a smaller diameter. This process is suitable for producing small- and medium-sized reducers.

　　 Pipe reducer connection type

　　Depending on the type of connection, pipe reducers are classified into socket-weld reducers and butt-weld reducers.

　　Socket-welded reducer and butt-welded reducer  

　　Socket-welded reducer fittings, also known as socket-welded inserts, are available in three types: Type 1, Type 2, and Type 3. They are manufactured in accordance with ASME B16.11.

　　The strength of socket-welded joints is half that of butt-welded joints; therefore, they are suitable for small-diameter pipes with NPS 2 or smaller. Butt-welded joints offer superior strength and are appropriate for high-pressure and high-temperature piping systems.

　　The end of the reducer for butt-welded joints is either flat or beveled, manufactured in accordance with ASME B16.9, and the welding procedure complies with ASME B16.25.