Butt Weld Eccentric Reducer
Butt Weld Eccentric Reducer
A Butt Weld Eccentric Reducer is a pipe fitting used to connect two pipes of different diameters while maintaining the bottom or top level of the pipe run. Unlike a concentric reducer, its centerlines are not aligned, making it ideal for horizontal pipe runs where air or liquid pockets must be avoided.
| Attribute | Description |
|---|---|
| Product Name | Eccentric Reducer |
| Type | Pipe Fitting |
| Size Range | 1/2″ to 48″ (or custom sizes as per requirement) |
| Standard | ASME B16.9, ASTM A234, MSS-SP-75, DIN, EN |
| Material Options | Carbon Steel, Stainless Steel, Alloy Steel |
| Material Grades | Carbon Steel: ASTM A234 WPB, WPC Stainless Steel: ASTM A403 WP304, WP316 Alloy Steel: ASTM A182 F5, F9, F11, F22 |
| Wall Thickness | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS |
| End Type | Beveled End (BE), Plain End (PE) |
| Length | Short (SR) and Long (LR) lengths as per standards |
| Pressure Ratings | Up to 6000 psi |
| Surface Finish | Black Painted, Sandblasted, Anti-Rust Coating, Galvanized |
| Applications | Oil and Gas, Petrochemical, Chemical, Power Plants, Water Treatment, and HVAC Systems |
| Compliance | ISO 9001, PED, NACE MR0175, RoHS, ASTM, ASME |
| Advantages | Smooth flow transition in piping systems, reduces turbulence and noise, is durable in high-pressure and corrosive environments, and reduces pipe misalignment. |
Eccentric Reducer Size
| Large End (inches) | Small End (inches) | Wall Thickness (Schedule) | Length (inches) |
|---|---|---|---|
| 3 | 2 | SCH 10, SCH 20, SCH 40 | 6 |
| 4 | 3 | SCH 10, SCH 20, SCH 40, SCH 80 | 6.5 |
| 6 | 4 | SCH 10, SCH 20, SCH 40, SCH 80 | 7.5 |
| 8 | 6 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160 | 8.5 |
| 10 | 8 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160 | 10 |
| 12 | 10 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS | 11 |
| 14 | 12 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS | 12 |
| 16 | 14 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS | 14 |
| 18 | 16 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS | 15 |
| 20 | 18 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS | 16 |
| 24 | 20 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS | 18 |
| 30 | 24 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS | 20 |
| 36 | 30 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS | 22 |
| 48 | 36 | SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, SCH XXS | 24 |
Butt Weld Eccentric Reducer Types
1. Seamless Eccentric Reducer
Manufacturing: No weld seam
Size Range: Typically up to 24″ NPS
Advantages: High integrity, ideal for high-pressure systems
2. Welded Eccentric Reducer
Manufacturing: Formed from plates or sections, then welded
Use: Common for large diameter pipelines (above 24″ NPS)
3. Butt-Welded Eccentric Reducer
Ends: Bevelled for butt welding
Standard: ASME B16.9
Application: Permanent installations in high-pressure pipelines
4. Socket Weld / Threaded Eccentric Reducer
Use: For smaller sizes in low-pressure systems
Standard: ASME B16.11
5. Concentric vs. Eccentric (For Clarity)
Eccentric: Flat side, centerlines are offset
Prevents air pockets in horizontal lines
Concentric: Symmetrical, same centerline
6. Fabricated Eccentric Reducer (Custom)
Made to Order: For special sizes or materials
Used In: Non-standard piping systems or exotic alloy applications
Applications
Pump suction lines – prevents air pockets
Horizontal pipelines – ensures smooth fluid flow
Oil & gas industry – pressure and flow control
Chemical plants – corrosive fluid handling
Water treatment systems – level-sensitive flow systems
HVAC systems – duct and piping alignment