China Factory Steel Pipe Reducers - High Quality Concentric & Eccentric Options from Reliable Suppliers
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 and 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 an eccentric reducer?
A concentric reducer has both ends aligned on the same centerline, making it ideal for vertical pipe runs and applications where symmetrical flow is required. An eccentric reducer has one flat side, keeping the top or bottom of the pipe flush — this is especially important 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" up to 48" (DN15 to DN1200), covering virtually all industrial piping applications. Wall thickness options range from SCH10 through XXS to meet various pressure and service requirements.
Q3
Which material grade should I choose for a high-temperature application?
For high-temperature service, alloy steel grades such as WP11, WP22, and WP91 (per ASTM A234) are commonly specified. For corrosive high-temperature environments, stainless steel grades like WP321 or WP347 (per ASTM A403) offer excellent oxidation resistance and creep strength.
Q4
What end connection types are available for pipe reducers?
Pipe reducers are available with butt weld ends (beveled for direct welding to pipe), socket weld ends (typically for smaller diameters ½" – 4"), and threaded ends with NPT or BSPT threads for screwed connections. Butt weld is the most common choice for high-pressure and large-diameter applications.
Q5
Are these reducers manufactured in accordance with international standards?
Yes. Pipe reducers are manufactured to ASME B16.9 dimensional standards, which govern factory-made wrought butt-welding fittings. Material standards follow ASTM specifications including A234 for carbon and alloy steel, A403 for stainless steel, and A815 for duplex and super duplex grades.
Q6
Can duplex or super duplex reducers be used in offshore and marine environments?
Yes. Duplex (UNS S31803, S32205) and super duplex (UNS S32750) stainless steel reducers per ASTM A815 offer excellent resistance to chloride stress corrosion cracking and pitting, making them highly suitable for offshore, marine, and subsea piping systems where seawater exposure is a concern.