Eccentric Butt Weld Reducer

Our seamless eccentric butt weld reducer is hot formed pipe fitting for pipeline diameter transition, designed to avoid liquid accumulation at the pipeline bottom. Produced strictly to ASME B16.9 standard, all sizes maintain full nominal dimension without minus tolerance, widely used in petroleum, chemical, water treatment and power plant piping systems.

Overview

Eccentric Butt Weld Reducer, also called eccentric reducing coupling, is a seamless hot forming butt-weld pipe fitting used to connect two pipes of different diameters. Compared with concentric reducer, its asymmetrical structure can keep pipeline bottom level, effectively prevent liquid or sediment pooling inside horizontal pipelines, avoid air lock and medium retention.

Raw materials cover carbon steel A234 WPB, stainless steel A403 WP304 / WP316L. All products adopt integral hot spinning forming, uniform wall thickness, smooth inner surface. We strictly control outer diameter, inner diameter and wall thickness, guarantee zero minus tolerance without thin-wall cutting corners. Complete inch & metric size range supports all industrial pipeline matching.

Core Key Features

Integral seamless hot spinning forming, high pressure resistance, uniform wall thickness distribution
Eccentric offset design, eliminate liquid accumulation & air lock in horizontal piping
Butt weld connection, easy full penetration welding, stable sealing for heavy industrial pipelines
Available materials: Carbon Steel A234 WPB; Stainless Steel A403 WP304 / WP316L
Comply with global standard ASME B16.9, GB/T 12459, IS 1239
Full size range: 1/2″ ~ 48″ / DN15 ~ DN1200, all custom reducing ratios supported
Zero minus tolerance on OD, ID and wall thickness, full standard nominal dimension
Full NDT non-destructive testing & dimensional inspection before shipment, complete MTC material certificates provided

Technical Specification

Item	Technical Parameter
Product Name	Eccentric Butt Weld Reducer
Connection Type	Butt Weld (BW)
Production Craft	Seamless Hot Spinning Forming
Executive Standard	ASME B16.9, ASTM A234, ASTM A403, IS 1239
Main Materials	Carbon Steel A234 WPB; Stainless Steel A403 WP304 / WP316L
Size Range	DN15 ~ DN1200 (1/2″ ~ 48″)
Wall Schedule	Sch40, Sch80, Sch160, XXS, Custom wall thickness
Structure Feature	Eccentric offset to prevent liquid accumulation
Dimensional Tolerance	Full standard nominal size, zero minus tolerance
Inspection Items	UT Ultrasonic Test, Hydrostatic Test, Full Dimension Inspection
Surface Treatment	Black anti-rust paint / Sandblasting / Pickling passivation (SS)

Applications

Our seamless eccentric butt weld reducers are essential fittings for horizontal industrial pipelines:

Petroleum & natural gas transmission horizontal trunk pipelines
Chemical plant horizontal process piping with liquid medium
Water supply, sewage and wastewater treatment engineering
Thermal power station steam & condensate horizontal piping
Food, pharmaceutical stainless steel clean pipeline
Indian local IS 1239 standard construction & municipal pipeline projects
Offshore platform horizontal fluid conveying pipelines

Why Choose Our Eccentric Butt Weld Reducer

Direct manufacturer supply, large stock of regular sizes, competitive factory ex-work price
All reducers full standard dimension with zero minus tolerance, no thin-wall cost cutting
Support custom reducing ratio, wall thickness, length and surface treatment per drawings
Strict full-process inspection, complete test certificates for export customs clearance
Fast delivery within 7–15 working days for standard stock items
Export wooden case packaging, anti-rust and anti-collision for long-distance sea transportation

FAQ

Q1: What is the difference between eccentric reducer and concentric reducer?

A: Concentric reducer has symmetrical center line, suitable for vertical pipelines; eccentric reducer adopts offset design, keeps pipe bottom flat, specially for horizontal pipelines to avoid liquid deposition and air lock.

Q2: Do your eccentric butt weld reducers have minus tolerance on wall thickness?

A: All our seamless pipe fittings are strictly manufactured to full nominal standard dimensions. We promise zero minus tolerance on outer diameter and wall thickness, never use thinner raw materials to reduce production cost.