ASME B16.28 refers to the standard specifying dimensions, tolerances, and material requirements for seamless and welded butt-welding fittings that includes 90-degree pipe fittings elbows. It used in pressure piping systems with nominal pipe sizes (NPS) ranging from 1/2 to 48, and covers multiple wall thickness schedules.
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Basic Dimension Definitions
Nominal Pipe Size (NPS): Nominal diameter of the elbow that match the connected pipe's NPS.
Center-to-End Distance (C): The distance from the center of the elbow's curvature to the end face (critical for installation space calculation).
Outside Diameter (OD): The outer diameter of the elbow's body that consistent with the connected pipe's OD.
Wall Thickness (t): The minimum thickness of the elbow's body, corresponding to the specified wall thickness schedule (Sch).
End Face Tolerance: The flatness and perpendicularity tolerance of the elbow's end face, ensuring tight butt-welding.
Dimension of b16.28 90 degree elbows
|
ELBOWs |
||
|
Nominal pipe size |
Outside diameter at bevel D |
Center-to-end A |
|
1 |
1.32 |
1.00 |
|
1 |
1.66 |
1.25 |
|
1 1/4 |
1.90 |
1.50 |
|
2 |
2.38 |
2.00 |
|
2 1/2 |
2.88 |
2.50 |
|
3 |
3.50 |
3.00 |
|
3 1/2 |
4.00 |
3.50 |
|
4 |
4.50 |
4.00 |
|
5 |
5.56 |
5.00 |
|
6 |
6.62 |
6.00 |
|
8 |
8.62 |
8.00 |
|
10 |
10.75 |
10.00 |
|
12 |
12.75 |
12.00 |
|
14 |
14.00 |
14.00 |
|
16 |
16.00 |
16.00 |
|
18 |
18.00 |
18.00 |
|
20 |
20.00 |
20.00 |
|
22 |
22.00 |
22.00 |
|
24 |
24.00 |
24.00 |
