Eccentric Pipe Reducer – No Liquid Trapping, Flat Bottom

Eccentric pipe reducer ensures smooth flow in horizontal lines. Available in stainless steel, cast iron. ASME B16.9 standard. Request a free quote now!

Description

Eccentric pipe reducer is generally connected to the piping system via butt-weld or socket-weld ends. Threaded or flanged ends are also available upon customer request.

The product design complies with ASME B16.9 and MSS SP-75 standards, with pressure classes ranging from Class 150 to Class 250, meeting diverse working conditions from low-pressure transmission to high-pressure steam pipelines. Wall thickness options cover Sch 10S to Sch 160, and all products undergo hydrostatic testing to guarantee zero leakage.

Core Features & Design Advantages

The top and bottom surfaces of the eccentric pipe reducer maintain a flat alignment, preventing air pockets and liquid accumulation in horizontal pipelines. This design is critical for steam systems, compressor pipelines and chemical medium transportation. It effectively avoids corrosion and water hammer damage caused by bubble impact.

AIFN offers a wide range of material options:

Pipe reducer stainless steel (304/316L): Acid and high-temperature resistant, suitable for food, pharmaceutical and marine service environments.
Cast iron eccentric reducer: Cost-effective and shock-resistant, widely used in drainage and municipal sewage projects.

As a professional eccentric fitting in piping, our products feature smooth inner wall transition to reduce turbulence and pressure drop.

For large-diameter reducing applications, the eccentric bell reducer delivers gradual diameter transition and lowers installation stress.

Every unit is processed with chemical composition analysis, dimensional inspection and radiographic testing to ensure stable and consistent batch quality.

Eccentric Pipe Reducer Specification Chart

Large End × Small End (inch)	Wall Thickness Schedule	Length L (mm)	Pressure Class	Common Material
4 × 3	Sch 40	152	Class 150	Stainless Steel 304
6 × 4	Sch 40	178	Class 150	Carbon Steel A234
8 × 6	SCH 40	203	Class 300	Cast Iron
10 × 8	Sch 80	229	Class 300	Stainless Steel 316L
12 × 10	Sch 160	254	Class 600	Alloy Steel

Note: Non-standard dimensions, wall thicknesses and materials are customizable. Please contact our sales team for lead time and MOQ information.

Application Scenarios of Eccentric Pipe Reducer

Eccentric reducer is extensively applied in multiple industries:

Oil and gas gathering and transmission pipelines (prevent condensate accumulation);
Inlet and outlet pipelines of chemical reactors (eliminate flash explosion risks caused by trapped gas);
Power plant feed water and steam pipelines (mitigate water hammer and internal corrosion);
Horizontal main pipelines in sewage treatment plants (maintain natural flow gradient);
CIP cleaning systems for food and beverage industry (prevent residual liquid and bacterial growth).

The eccentric pipe reducer is the optimal solution when pipelines require diameter reduction while keeping a consistent pipe bottom elevation.

Buyer Common FAQ

Q1: When to choose an eccentric reducer instead of a concentric reducer?

A: Eccentric reducers are mandatory for horizontal pipelines carrying condensable media such as steam and compressed air, or applications requiring top gas accumulation prevention. Installed with the flat side downward, it ensures continuous liquid discharge. In contrast, concentric reducers are ideal for vertical pipelines or fully filled single-medium vertical sections. Improper selection may lead to water hammer, corrosion perforation and even explosion hazards.

Q2: What are the price and performance differences between stainless steel eccentric reducer and cast iron type?

A: The unit price of stainless steel grades (304/316L) is about 3 to 5 times that of cast iron. It provides outstanding resistance to chloride ion, acid and alkali corrosion, along with superior high-temperature mechanical strength. Cast iron eccentric reducer features low cost and good vibration & noise reduction performance, fit for normal-temperature clean water and sewage conveyance, yet it has high brittleness and poor resistance to oxidizing acid. We recommend material selection based on medium corrosivity, operating temperature and design service life. Free material comparison sheets and life cycle cost analysis are available upon request.