What is the purpose of a concentric reducer
Jul 03, 2025
Concentric Reducer is a pipe reducer with the center axis aligned. It connects different pipe diameters through smooth transition. Its core uses and advantages are as follows:
Core function: smooth transition of fluid and system optimization
Eliminate vortex and pressure drop
Avoid turbulence and energy loss caused by sudden change of pipe diameter, and maintain fluid stability through tapered gradient design (cone angle ≤ 30°). For example, in the catalytic cracking unit of the refinery, the diameter change from DN300 to DN200 increases the catalyst delivery efficiency by 12% and reduces the pressure drop by 17%.
Simplified installation structure
The centerline alignment feature eliminates complex compensation components, such as directly replacing the T-type three-way + valve combination in the thermal pipe network, which reduces the steam leakage rate by 40%.
Key application scenarios
1. Industrial high pressure/high temperature system
Petrochemical industry: 304 stainless steel concentric reducer connects the reactor and branch pipe at 300℃ and 4.0MPa, which is corrosion-resistant and ensures smooth transportation of granular media;
Steam pipe network: follow BS EN 10253-4 standard, and use it when the flow rate is greater than 25m/s to prevent water hammer effect.
2. Building water supply and drainage system
Water supply riser: adopt "upper large and lower small" step diameter change (for example: DN150→DN100→DN80), save 23% of copper and improve the top water pressure stability by 15%;
Sewage riser: configure according to the principle of "lower large and upper small" (such as DN125→DN160), reduce drainage air resistance by 60% (recommended by Japan's "Building Equipment Design Benchmark")
3. Municipal Pipeline
Network Renovation Integrated Pipeline Corridor: Ductile iron concentric reducers (DN400/DN300) control the sewage flow rate in the ideal range of 0.6–2.4m/s, saving 40% space compared to the traditional flange solution;
Heating Project: Prefabricated insulated reducers directly connect the DN500 trunk pipe and the DN350 branch pipe, reducing the heat loss rate from 6.3% to 4.1%. ️
