Reducers
Reducers are used to connect pipes of different diameters, providing a smooth transition that minimizes turbulence and pressure loss. Concentric reducers maintain a common centerline and are used in vertical piping and pump suction applications. Eccentric reducers have an offset bottom (flat side down) to prevent air accumulation in horizontal lines, making them essential for pump suction piping where vapor pockets must be avoided.
Our reducers are manufactured from seamless pipe and welded plate to ASME B16.9 and DIN 2616 standards. The transition angle is carefully controlled to balance compactness with flow characteristics. All reducers are supplied with beveled ends and can be produced in custom lengths for specialized applications requiring gradual diameter changes over longer distances.
ASME B16.9 / DIN 2616
ASTM A234 WPB
DN20-DN1200
Applications
- Pump suction and discharge piping
- Pipe size transitions in process lines
- Compressor station piping
- Tank farm and terminal piping
- Water distribution network transitions
Quality Assurance
All Reducers products undergo NDT testing with MTC per EN 10204 3.1. Third-party inspection by SGS, BV, TUV available.
Reducers Technical Specifications & Standards
Reducers are pipe fittings that connect pipes of different diameters, used to transition between pipe sizes in a piping system. They are available in concentric (symmetric) and eccentric (offset) configurations.
| Parameter | Specification |
|---|---|
| Standard | ASME B16.9 / DIN 2616 / EN 10253-2 / GOST 17378 |
| Type | Concentric and Eccentric (flat-side down or up) |
| Size Range | DN20 to DN1200 |
| Material Grades | ASTM A234 WPB, WP304/L, WP316/L, WP22, WP91 |
| End Type | Butt-weld ends, beveled per ASME B16.25 |
Selection Guide: Concentric vs Eccentric
Selecting the correct reducer type is critical for proper piping system operation:
When to Use Concentric Reducers
- Vertical piping runs where symmetry is preferred.
- Gas and vapor lines where air pockets are not a concern.
- Pump discharge lines (vertical) for smooth flow transition.
- Where flow direction change is minimal and turbulence is acceptable.
When to Use Eccentric Reducers
- Horizontal pump suction lines - flat-side-down prevents air pockets and cavitation.
- Horizontal piping where drainage slope must be maintained.
- Lines where sediment or solids could accumulate (flat-side-up to prevent settling).
- Per ASME B31.3, eccentric reducers with flat-side-down are mandatory at pump suctions.