China Steel Pipe Reducers Suppliers - Concentric and Eccentric Types from Trusted 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 prevent cavitation on vertical pump suction lines; eccentric reducers avoid air pockets on horizontal suction lines.
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 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
Q
What is the difference between a concentric and an eccentric reducer?
A concentric reducer has both ends aligned on the same centerline, making it suitable for vertical piping and applications where uniform flow distribution is needed. An eccentric reducer has one flat side, keeping the top or bottom of the pipe flush — this is preferred for horizontal pump suction lines to prevent air pockets and avoid cavitation.
Q
What size range is available for pipe reducers?
Pipe reducers are available in a wide size range from ½" to 48" (DN15 to DN1200), covering the majority of industrial piping applications from small-diameter instrument lines to large-diameter transmission pipelines.
Q
Which material grade should I choose for high-temperature service?
For high-temperature service, alloy steel grades such as WP11, WP22, and WP91 (per ASTM A234) are commonly specified. WP91 in particular is widely used in power generation applications at elevated temperatures and pressures. Stainless steel grades like WP321 and WP347 are also suitable for high-temperature environments due to their oxidation resistance.
Q
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 welding to pipe), Socket Weld Ends (for smaller diameters typically ½" to 4"), and Threaded Ends with NPT or BSPT threads for screwed connections. The choice depends on the pipe size, pressure rating, and installation requirements.
Q
Are duplex and super duplex reducers suitable for corrosive environments?
Yes. Duplex (UNS S31803, S32205) and super duplex (S32750) stainless steel reducers per ASTM A815 offer excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. They are widely used in offshore, marine, chemical processing, and desalination applications where aggressive corrosive media are present.
Q
What standard governs the dimensions of butt weld pipe reducers?
The dimensional standard for butt weld pipe fittings including reducers is ASME B16.9. This standard specifies the overall length, end-to-end dimensions, outside diameter tolerances, and wall thickness requirements to ensure interchangeability and proper fit-up with matching pipe sizes across all schedule designations.