ASME B16.11 Concentric Swaged Nipple is a type of reducing pipe fitting manufactured using a forging process. Its core function is to achieve a concentric transition connection between two pipes of different nominal diameters – the centerlines of the large and small ends are perfectly aligned, forming a symmetrical conical transition structure, suitable for applications requiring high stability of fluid flow.
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Connection Requirements
Common types include: bevel ends on both sides (BBE), threaded ends on both sides (TBE), one bevel end and one threaded end (BXT), and plain ends on both sides (PBE). Bevel ends are used for butt welding, plain ends for socket welding, and threaded ends (usually NPT threads, conforming to ASME B1.20.1 standard) for threaded connections. Special end structures can be customized according to customer needs in some cases.
Structural Features and Advantages of Concentric Swaged Nipples
Concentric Symmetrical Structure: The centerlines of the large and small ends are perfectly aligned, resulting in a smooth transition of fluid flow, effectively reducing fluid resistance and turbulent noise, and preventing media from accumulating at the transition point. This is especially suitable for conveying media that are prone to crystallization and sedimentation, reducing the risk of pipe blockage and protecting the inner wall of the pipe from erosion damage.
Compact and Lightweight Structure: The conical transition design results in a much smaller volume and lighter weight compared to traditional reducing pipe fittings, saving installation space. This is particularly suitable for equipment interfaces with dense piping and limited space (such as pump and valve inlets and outlets), while also reducing the overall weight and installation costs of the piping system.
High Strength and High Sealing Performance: Manufactured using a forging process, the forged material has a finer grain structure, resulting in significantly higher tensile strength and yield strength than cast parts. It can withstand high pressure, high temperature, and frequent pressure fluctuations. The connection provides excellent sealing performance with a very low risk of leakage, making it suitable for demanding working conditions in petrochemical, power generation, and other industries.
Versatility: Strictly manufactured according to ASME B16.11 standards, the dimensions, pressure ratings, and connection methods are standardized. Products from different manufacturers are interchangeable, facilitating procurement, installation, and maintenance, while also reducing spare parts inventory costs.
|
Nominal size |
OD at end |
Length of small end |
End to end |
|
|
DN |
NPS |
OD1×0D2 |
SL min |
A |
|
8×6 |
1/4×1/8 |
13.7×10.3 |
20 |
57 |
|
10×6 |
3/8×1/8 |
17.1×10.3 |
20 |
64 |
|
10×8 |
3/8×1/4 |
17.1×13.7 |
20 |
|
|
15×6 |
1/2×1/8 |
21.3×10.3 |
20 |
70 |
|
15×8 |
1/2×1/4 |
21.3×13.7 |
20 |
|
|
15×10 |
1/2×3/8 |
21.3×17.1 |
20 |
|
|
20×6 |
3/4×1/8 |
26.7×10.3 |
20 |
76 |
|
20×8 |
3/4×1/4 |
26.7×13.7 |
20 |
|
|
20×10 |
3/4×3/8 |
26.7×17.1 |
22 |
|
|
20×15 |
3/4×1/2 |
26.7×21.3 |
22 |
|
|
25×6 |
1×1/8 |
33.4×10.3 |
20 |
89 |
|
25×8 |
1×1/4 |
33.4×13.7 |
20 |
|
|
25×10 |
1×3/8 |
33.4×17.1 |
22 |
|
|
25×15 |
1×1/2 |
33.4×21.3 |
22 |
|
|
25×20 |
1×3/4 |
33.4×26.7 |
22 |
|
|
32×6 |
11/4×1/8 |
42.2×10.3 |
20 |
102 |
|
32×8 |
11/4×1/4 |
42.2×13.7 |
20 |
|
|
32×10 |
11/4×3/8 |
42.2×17.1 |
22 |
|
|
32×15 |
11/4×1/2 |
42.2×21.3 |
22 |
|
|
32×20 |
11/4×3/4 |
42.2×26.7 |
25 |
|
|
32×25 |
11/4×1 |
42.2×33.4 |
25 |
|
|
40×6 |
11/2×1/8 |
48.3×10.3 |
20 |
114 |
|
40×8 |
11/2×1/4 |
48.3×13.7 |
20 |
|
|
40×10 |
11/2×3/8 |
48.3×17.1 |
22 |
|
|
40×15 |
11/2×1/2 |
48.3×21.3 |
25 |
|
|
40×20 |
11/2×3/4 |
48.3×26.7 |
25 |
|
|
40×25 |
11/2×1 |
48.3×33.4 |
25 |
|
|
40×32 |
11/2×11/4 |
48.3×42.2 |
25 |
|
|
50×6 |
2×1/8 |
60.3×10.3 |
20 |
165 |
|
50×8 |
2×1/4 |
60.3×13.7 |
22 |
|
|
50×10 |
2×3/8 |
60.3×17.1 |
22 |
|
|
50×15 |
2×1/2 |
60.3×21.3 |
25 |
|
|
50×20 |
2×3/4 |
60.3×26.7 |
30 |
|
|
50×25 |
2×1 |
60.3×33.4 |
30 |
|
|
50×32 |
2×11/4 |
60.3×42.2 |
30 |
|
|
50×40 |
2×11/2 |
60.3×48.3 |
30 |
|
|
100×40 |
4×11/2 |
114.3×48.3 |
40 |
229 |
|
100×50 |
4×2 |
114.3×60.3 |
45 |
|
|
100×65 |
4×21/2 |
114.3×73.0 |
45 |
|
|
100×80 |
4×3 |
114.3×88.9 |
45 |
|
|
100×90 |
4×31/2 |
114.3×101.6 |
45 |
|
|
125×8 |
5×1/4 |
141.3×13.7 |
25 |
279 |
|
125×10 |
5×3/8 |
141.3×17.1 |
25 |
|
|
125×15 |
5×1/2 |
141.3×21.3 |
25 |
|
|
125×20 |
5×3/4 |
141.3×26.7 |
30 |
|
|
125×25 |
5×1 |
141.3×33.4 |
30 |
|
|
125×32 |
5×11/4 |
141.3×42.2 |
40 |
|
|
125×40 |
5×11/2 |
141.3×48.3 |
40 |
|
|
125×50 |
5×2 |
141.3×60.3 |
45 |
|
|
125×65 |
5×21/2 |
141.3×73.0 |
45 |
|
|
125×80 |
5×3 |
141.3×88.9 |
45 |
|
|
125×90 |
5×31/2 |
141.3×101.6 |
45 |
|
|
125×100 |
5×4 |
141.3×114.3 |
50 |
|
|
150×15 |
6×1/2 |
168.3×21.3 |
30 |
304 |
|
150×20 |
6×3/4 |
168.3×26.7 |
30 |
|
|
150×25 |
6×1 |
168.3×33.4 |
40 |
|
|
150×32 |
6×11/4 |
168.3×42.2 |
40 |
|
|
150×40 |
6×11/2 |
168.3×48.3 |
45 |
|
|
150×50 |
6×2 |
168.3×60.3 |
45 |
|
|
150×65 |
6×21/2 |
168.3×73.0 |
45 |
|
|
150×80 |
6×3 |
168.3×88.9 |
45 |
|
|
150×90 |
6×31/2 |
168.3×101.6 |
50 |
|
|
150×100 |
6×4 |
168.3×114.3 |
50 |
|
|
150×125 |
6×5 |
168.3×141.3 |
60 |
|
Note:
When ordering according to SH/T3419 standard, the outer diameter should be the one specified in SH/T3405 "Series of Outer Diameters for Steel Pipes in Petrochemical Enterprises".
