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Manufacturing Methods and Classification of Reducing Pipes
Release time:
Oct 01,2021
With the development of the petrochemical industry, engineering projects have been trending toward larger scales and greater complexity. Consequently, the pipe fittings used in pipeline engineering are also evolving to meet varying operating conditions. The materials used for these fittings can include pipes, forgings, castings, and other materials, and they can be fabricated using methods such as welding, stamping, casting, or forging. Among these fittings, the most common and widely used are either tee fittings or reducers. So, how much do you know about reducers? Do you know their manufacturing methods, classifications, and applications?
With the development of the petrochemical industry, engineering projects have been trending toward larger scales and greater complexity. Consequently, the pipe fittings used in pipeline engineering are also evolving to meet varying operating conditions. The materials used for these fittings can include pipes, forgings, castings, and other materials, and they can be fabricated using methods such as welding, stamping, casting, or forging. Among these fittings, the most common and widely used are either tee fittings or reducers. So, how much do you know about reducers? Are you familiar with their manufacturing methods, classifications, and applications?
A reducer, as its name suggests, is a pipe fitting used to connect two sections of pipe with different diameters or cross-sectional areas. Therefore, reducers are also referred to as "large-to-small fittings." Depending on the shape of the fitting, reducers can be classified into circular reducers, rectangular reducers, square reducers, and rectangular connectors with twisted orientations. Based on the difference in diameter between the two ends of the fitting, reducers are further categorized into concentric reducers and eccentric reducers. It’s worth noting that circular and square reducers are prone to both concentric and eccentric diameters, whereas rectangular reducers typically result only in either single-sided or double-sided eccentricity.
The key difference between concentric reducers and eccentric reducers lies in whether the ends of the pipe fittings are aligned on the same axis. The main results are as follows:
(1) The midpoints of the pipe openings at both ends of the reducing pipe are located on the same axis. Therefore, when the diameter of the pipe fitting changes, the disturbance to the fluid flow pattern is minimal, which promotes smooth fluid flow and makes it suitable for applications involving changes in the diameter of gas or vertical liquid pipelines.
(2) One end of an eccentric reducer is flat; as the diameter changes, both the location and orientation of the cutting point vary. Accordingly, the installation and functionality of an eccentric reducer differ depending on its orientation. Specifically: when the cutting point of the pipe opening faces upward, this is referred to as top-mounted installation and is typically used at pump inlets, facilitating air venting; when the cutting point of the pipe opening faces downward, it is generally used for installing control valves and draining fluids. In most cases, horizontal liquid pipelines commonly employ eccentric reducers.
3. Manufacturing Method and Process of Reducing Pipe Sections
(1) The manufacturing method for reducer pipes should be selected based on user requirements and national standards. In general, the roundness of pipes with different diameters should not exceed 1% of the corresponding outer diameter at each end, with an allowable deviation of ±3 mm.
(2) The forming processes for reducing-diameter pipes include reduced-diameter forming, expanded-diameter pressing, or a combination of reduced-diameter and expanded-diameter forming. Stamping can also be used for certain specifications of pipe materials with different diameters.
(3) Regardless of the forming method used, the manufacturing process for reducing tees is similar: it requires inspection of the received material, marking and unfolding, inspection of the cut material, checking the fitting and folding, before the final shaping can be completed.
The above article provides an introduction to reducing tees. We hope you’ve gained some understanding of them.
You can also learn more about industry trends.
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