Concentric Swage Reducer – SS Fitting for Pipe Reduction

As an essential concentric pipe fitting in piping systems, the Concentric Swage Reducer is engineered for concentric transition of pipelines with different diameters. Its central line maintains strict alignment, effectively reducing turbulence and pressure drop, making it suitable for vertical installation and high flow rate working conditions.

This product is manufactured from stainless steel grades including ASTM A403 WP304/304L, WP316/316L, and carbon steel A234 WPB. Standard sizes range from 1/2″ to 24″, among which the 12″ x 6″ concentric reducer is a commonly matched component for high-flow pipelines. All ss reducers undergo solution treatment and pickling passivation to eliminate welding stress and improve resistance to intergranular corrosion. Custom non-standard dimensions and wall thicknesses are available upon drawings.

Connection ends can be processed as Butt Weld (BW, compliant with ASME B16.9), Socket Weld (SW, compliant with ASME B16.11) or threaded ends (NPT/BSPT). The table below lists dimensional parameters of commonly used ss concentric reducer (stainless steel, Sch 10S / Sch 40S wall thickness):

The overall length L complies with ASME B16.9 standards with a tolerance of ±1.6mm. 3.1 material certificates and EN 10204 inspection reports can be provided.

Concentric Swage Reducer is widely applied in petrochemical pipelines, pharmaceutical water systems, marine engine room piping and high-pressure boiler feed water systems. Compared with eccentric reducers, the concentric design prevents air bubble accumulation when fluid requires coaxial flow. For instance, the adoption of a 12″ x 6″ concentric reducer in vertical pump inlet pipelines greatly lowers eddy current and extends the service life of pump bodies and sealing parts.

AIFN adopts cold extrusion or hot pushing forming processes to ensure uniform wall thickness and wrinkle-free surfaces. Every unit undergoes dimensional inspection, Radiographic Testing (RT) or Penetrant Testing (PT), with exclusive material traceability codes attached.

With years of export experience, our products meet international standards including ASTM/ASME/DIN/JIS, and support third-party inspections such as SGS and BV.

Q1: What is the difference between Concentric Swage Reducer and eccentric reducer? When is a concentric type mandatory?

A: A concentric reducer features a collinear central line, while an eccentric reducer keeps a flat bottom surface. Concentric reducers are ideal for vertical pipelines or scenarios requiring symmetrical axial fluid flow, such as pump inlet risers and high-pressure spray systems. It prevents accumulation of air bubbles and solid particles at low points, whereas eccentric reducers are used for horizontal pipelines to avoid air pocket formation. Prioritize this concentric pipe fitting for vertically installed pipelines or applications requiring minimum pressure loss.

Q2: How to select the correct wall thickness Schedule for a 12″ x 6″ concentric reducer?

A: Wall thickness selection depends on design pressure, temperature and medium corrosiveness. For ss concentric reducer (stainless steel):

We can conduct wall thickness verification in accordance with ASME B31.3 and provide complete selection charts. Share your working condition parameters including pressure, temperature and conveyed medium, and we will offer a free technical proposal.