In piping systems, managing changes in pipe diameter is essential for ensuring proper flow, pressure regulation, and equipment compatibility. Two critical fittings used for this purpose are the eccentric reducer and the concentric reducer. At Piyush Steel, a leading manufacturer and supplier of industrial pipe fittings, we provide both types in high-quality materials like stainless steel, carbon steel, and alloy steel.
In this blog, we’ll explain the difference between eccentric reducer and concentric reducers, their applications, and how to choose the right one.
What is a Reducer?
A reducer is a type of pipe fitting used to join two pipes of different diameters. It helps maintain flow consistency and manage pressure drop. Reducers are available in two main types:
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Concentric Reducer – Cone-shaped; aligned to the center axis
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Eccentric Reducer – Off-center, with one side flat
Concentric Reducer – Centered Flow Transition
A concentric reducer has a symmetrical, cone-like shape. The centerline of both ends (large and small) remains aligned, ensuring smooth flow in vertical piping systems.
🔧 Features:
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Centered alignment
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Used in vertical lines or pressurized fluid flow
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Avoids turbulence and cavitation
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Easy to fabricate and install
✅ Common Applications:
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Pump discharge and suction piping
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Vertical pipelines
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Steam and gas flow lines
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Horizontal systems where fluid drainage is not a concern
Eccentric Reducer – Flat-Side Alignment
An eccentric reducer has an offset center, with one side flat. This design helps prevent the accumulation of air or liquid, making it ideal for horizontal piping systems.
🔧 Features:
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One flat side, preventing air pockets
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Maintains bottom or top pipe level
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Designed for horizontal flow systems
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Helps in avoiding cavitation in pumps
✅ Common Applications:
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Horizontal pump suction lines (flat side on top)
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Drainage systems
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Piping near tanks or sumps
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Slurry or chemical transport
Key Differences – Eccentric vs Concentric Reducer
| Feature | Concentric Reducer | Eccentric Reducer |
|---|---|---|
| Shape | Symmetrical cone | Asymmetrical, flat side |
| Centerline Alignment | Yes | No |
| Suitable for | Vertical flow | Horizontal flow |
| Drainage | May trap liquid or air | Prevents air/liquid buildup |
| Pump Suction | Less preferred | Preferred (flat on top) |
| Application Focus | Gas & vapor systems | Liquid & slurry systems |
Materials and Standards at Piyush Steel
We manufacture reducers in various grades including:
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Stainless Steel (SS 304, SS 316, etc.)
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Carbon Steel (ASTM A234 WPB)
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Alloy Steel, Duplex, Inconel, Monel
Standards followed:
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ASME B16.9, MSS-SP 75, DIN, and ISO
Available sizes range from 1/2” to 48” NB, with seamless and welded options, custom thicknesses, and finishing as per project needs.
Why Choose Piyush Steel?
As a trusted pipe fittings manufacturer in India, Piyush Steel supplies top-grade concentric and eccentric reducers to power plants, petrochemical units, water treatment facilities, oil & gas companies, and heavy industries across the globe.
✔ In-stock inventory
✔ Custom manufacturing available
✔ Third-party inspection reports
✔ Global shipping support
✔ Competitive pricing with uncompromised quality