Concentric Swage Nipples vs Eccentric Swage Nipples: Which One You Should Choose?

Swage nipples are widely used in piping systems to connect pipes of different diameters. As a type of pipe reducer, they are favored in high-pressure applications for their compact design and strong connection. Among swage nipples, two major types are commonly used: concentric swage nipples and eccentric swage nipples. While they serve a similar purpose, the structural differences between them determine their use in specific situations. Let’s take a closer look.

What is a swage nipple?

A swage nipple is a pipe fitting that allows a smooth transition between two different pipe sizes. It typically has a larger end and a smaller end, with a tapered body in between. Swage nipples are available in threaded or socket-welded types and are usually made from carbon steel, stainless steel, or alloy steel.

Swage nipples are manufactured according to standards such as ASME B16.11 or MSS SP-95, and are widely used in oil & gas, petrochemical, power plants, and high-pressure piping systems.

Concentric Swage Nipples vs Eccentric Swage Nipples: What’s the Structural Difference?

Feature	Concentric Swage Nipple	Eccentric Swage Nipple
Shape	Symmetrical; both ends share the same centerline	Asymmetrical; offset centerlines
Flow Alignment	Keeps the fluid centered in the pipeline	Aligns with the bottom (or top) of the pipe
Appearance	Tapered evenly around the axis	Tapered on one side, flat on the other

Which one should you choose for your project?

By comparing the structural differences between concentric and eccentric swage nipples, it can be found that Selecting the right swage nipple for your piping system depends largely on the orientation of the pipeline and the functional requirements of your application. The following summarizes the scenarios in which the two types of swage nipple are applicable：

Use a Concentric Swage Nipple When:

1.Your pipeline runs vertically.

2.You don’t need to worry about air or fluid accumulation.

3.Symmetrical flow is preferred, helping to reduce turbulence.

4.The system involves pressurized fluid transfer.

Use an Eccentric Swage Nipple When:

1.Your pipeline runs horizontally, and drainage or venting is a concern.

2.You want to avoid air pockets or fluid pooling.

3.It’s important to maintain a constant top or bottom elevation in the pipe.

Get High-Quality Swage Nipples from Haihao Group

At Haihao Group, we manufacture and supply both concentric and eccentric swage nipples in a wide range of materials and sizes, in full compliance with international standards like ASME, MSS, and EN. Whether you need carbon steel, stainless steel, or special alloy materials, we provide custom solutions with strict quality control and full certification

Contact us today to get technical support or a quotation for your piping project.