China Steel Pipe Reducers - Eccentric & Concentric Types by Reliable Suppliers and Factory
Specification
| Parameter | Range / Options |
| Size Range | ½" – 48" (DN15 – DN1200) |
| Wall Thickness | SCH10, SCH20, SCH30, STD, SCH40, SCH60, XS, SCH80, SCH100, SCH120, SCH140, SCH160, XXS |
| Length | ASME B16.9 standard dimensions |
Material Standard
| Material Type | Standard | Common Grades |
| Carbon Steel | ASTM A234 | WPB, WPC, WPL6 |
| Stainless Steel | ASTM A403 | WP304/L, WP316/L, WP321, WP347 |
| Alloy Steel | ASTM A234 | WP11, WP22, WP91 |
| Duplex / Super Duplex | ASTM A815 | UNS S31803, S32205, S32750 |
End Connections
- Butt Weld Ends: Beveled ends for welding directly to pipe
- Socket Weld Ends: For smaller diameters, typically ½" – 4"
- Threaded Ends: NPT or BSPT threads for screwed connections
Applications
Pipeline Transitions
Reducers are essential where pipelines change diameter to accommodate varying flow requirements, connect to different equipment, or transition between main lines and branch lines.
Pump Suction and Discharge
Concentric reducers are often installed on pump suction lines in vertical orientation to prevent cavitation, while eccentric reducers are used on horizontal suction lines to avoid air pockets.
Pressure Vessel & Tank Connections
Reducers facilitate connections between large vessel nozzles and smaller process piping, ensuring proper fit-up and flow characteristics.
Compressor Stations
In gas transmission systems, reducers accommodate size changes between compressor discharge piping and main transmission lines.
Chemical Processing Plants
Reducers allow for transitions between reactors, heat exchangers, and storage tanks where pipe sizes vary based on process requirements.
Water Treatment Facilities
Used extensively in filtration systems, pump stations, and distribution networks where pipe diameters change to match hydraulic requirements.
Power Generation
Steam and cooling water systems utilize reducers to connect boilers, turbines, and auxiliary equipment with different connection sizes.
Fire Protection Systems
Reducers connect main supply lines to branch lines and sprinkler system components where diameter reductions are necessary.
Marine and Offshore
Shipboard piping systems employ reducers in fuel, ballast, and cooling water lines where space constraints require size transitions.
HVAC Systems
Chilled water and hot water distribution networks use reducers to connect chillers, boilers, and air handling units to main piping loops.
Frequently Asked Questions
Q1
What is the difference between a concentric and eccentric pipe reducer?
A concentric reducer has both ends centered on the same axis, making it ideal for vertical pipelines. An eccentric reducer has one flat side, keeping the top or bottom of the pipe flush — this is commonly used on horizontal pump suction lines to prevent air pockets and cavitation.
Q2
What size range is available for pipe reducers?
Pipe reducers are available in a wide size range from ½" (DN15) up to 48" (DN1200), covering most industrial piping applications. Wall thickness options include SCH10 through SCH160 and XXS, conforming to ASME B16.9 standard dimensions.
Q3
Which material grades are available for stainless steel pipe reducers?
Stainless steel pipe reducers conforming to ASTM A403 are available in grades WP304, WP304L, WP316, WP316L, WP321, and WP347. These grades offer excellent corrosion resistance and are suitable for chemical, food processing, and high-temperature applications.
Q4
What end connection types are available for pipe reducers?
Pipe reducers are available with three main end connection types: Butt Weld ends (beveled for direct pipe welding), Socket Weld ends (suitable for smaller diameters up to 4"), and Threaded ends with NPT or BSPT threads for screwed connections.
Q5
Are duplex and super duplex reducers available, and when should they be used?
Yes, duplex (UNS S31803, S32205) and super duplex (S32750) reducers conforming to ASTM A815 are available. These materials are recommended for highly corrosive environments such as offshore oil and gas, seawater handling, and chemical processing where standard stainless steel grades are insufficient.
Q6
What industries commonly use pipe reducers?
Pipe reducers are widely used across many industries including oil and gas, chemical processing, water treatment, power generation, fire protection, HVAC, marine and offshore, and compressor stations. Any system requiring a change in pipe diameter to manage flow rates, connect equipment, or meet hydraulic design requirements will utilize reducers.