Product Description: Concentric reducer is a type of pipeline connector with different diameters at both ends but overlapping centerlines. …
Eccentric Reducer
An Eccentric Reducer is a pipe fitting designed to connect pipes of different diameters while maintaining one side of the pipe level. Unlike a concentric reducer, the centerlines of the two ends do not coincide, creating an offset that helps prevent the formation of air pockets or liquid accumulation within the piping system.
Due to its unique design, the eccentric reducer is widely used in oil & gas, petrochemical, water treatment, power generation, and industrial process piping systems where efficient flow and proper drainage are essential.
Product Features
• Offset Centerline Design
The centerlines of the large and small ends are intentionally offset, allowing smooth pipe diameter transitions while maintaining either the top or bottom of the pipeline level.
• Prevents Air and Liquid Accumulation
Designed to eliminate trapped air in gas pipelines and prevent liquid buildup in liquid transport systems, improving operational efficiency and reducing maintenance requirements.
• Smooth Flow Transition
The tapered internal surface minimizes turbulence, pressure loss, and flow disruption during the diameter reduction process.
• Improved System Reliability
Helps prevent cavitation, air locking, sediment accumulation, and flow restrictions in critical pipeline applications.
• Multiple Material Options
Available in carbon steel, stainless steel, alloy steel, and other materials to suit various operating conditions.
Types of Eccentric Reducers
Flat on Top (FOT)
The top surface remains level while the bottom surface slopes downward.
Benefits:
• Prevents air pocket formation
• Ensures smooth gas and steam flow
• Reduces the risk of gas blockage
• Commonly used in gas and vapor pipeline systems
Flat on Bottom (FOB)
The bottom surface remains level while the top surface slopes upward.
Benefits:
• Prevents liquid accumulation
• Eliminates sediment build-up
• Improves drainage performance
• Ideal for liquid, slurry, and wastewater systems
Manufacturing & Quality Control
Haiyuan Pipe Fittings manufactures Eccentric Reducers using advanced production technologies and strict quality control procedures to ensure dimensional accuracy and reliable performance.
Stamping Forming
Suitable for small and medium-sized reducers. Precision molds are used to create accurate dimensions and smooth internal surfaces.
Forging Forming
Recommended for high-pressure and heavy-duty applications. Forged reducers provide superior strength and excellent pressure resistance.
Welded Fabrication
Large-diameter and custom-size reducers can be fabricated through welding processes, followed by comprehensive inspection and testing.
Each reducer undergoes strict inspections including:
• Raw Material Verification
• Dimensional Inspection
• Surface Examination
• Welding Quality Inspection
• Mechanical Property Testing
• Pressure Testing
• Final Quality Control Verification
Materials & Standards
Available Materials
• Carbon Steel (ASTM A234 WPB, Q235B, 20# Steel)
• Stainless Steel (ASTM A403 WP304, WP304L, WP316, WP316L)
• Alloy Steel (ASTM A234 WP11, WP22, WP91)
• Low Temperature Steel
• Customized Materials Available
Manufacturing Standards
Produced according to international standards including:
• ASME B16.9
• ASTM A234
• ASTM A403
• EN 10253
• DIN Standards
• GB/T 12459
• GB/T 13401
Applications
Eccentric Reducers are widely used in:
• Oil & Gas Pipeline Systems
• Petrochemical Plants
• Chemical Processing Facilities
• Water Supply & Water Treatment Systems
• Wastewater Treatment Plants
• Power Generation Projects
• HVAC Systems
• Industrial Process Piping
• Shipbuilding Industry
• Mining and Slurry Transportation Systems
Typical Uses
• Pump Suction and Discharge Lines
• Gas and Steam Pipelines
• Drainage Systems
• Slurry and Wastewater Pipelines
• Pipeline Diameter Transitions Requiring Air or Liquid Pocket Prevention
Installation Considerations
Correct Orientation Selection
Select Flat on Top (FOT) for gas and steam pipelines to prevent air accumulation. Select Flat on Bottom (FOB) for liquid pipelines to prevent liquid retention and sediment build-up.
Proper Size Matching
Ensure the reducer dimensions match the nominal pipe sizes of the connected pipelines for reliable installation and operation.
Pressure Rating Selection
Choose the appropriate wall thickness and material grade according to the operating pressure and applicable standards.
Welding Requirements
Maintain proper alignment during installation and perform pressure testing after welding to verify leak-tight performance.
Why Choose Haiyuan Eccentric Reducer
✔ Factory Direct Supply
✔ Strict Quality Control
✔ Complete Size & Material Range
✔ Customized Manufacturing Available
✔ Competitive Pricing
✔ Fast Delivery
✔ International Standard Compliance
✔ Professional Export Service