As its name suggests, short radius elbows are significantly more compact in size. They are designed such that the radius of the bend is equivalent to the diameter of the pipe. Due to their unique design, these elbows are not commonly used in high-pressure pipeline systems. However, they are frequently employed in low-pressure fluid applications where space constraints are an issue, or when rapid directional changes are necessary.
Table of Contents
Specification of SR Elbows
Short Radius 90 Degree Elbow Dimensions
45 Degree SR Elbow Dimensions
ASME B16.9 Short Radius Elbow Dimensions in Inches
Short Radius Elbow Formula
Applications of SS Short Radius Elbows
Comparison: Long Radius vs Short Radius Elbows
Weight Chart for 90 Degree SR Elbows
Types of Short Radius Elbows
Tolerance of Inconel Buttweld SR Elbows
Marking for Nickel Alloy Buttweld SR Elbows
Materials and Grades of ANSI B16.9 SR Elbows
ASME B16.9 SR Elbow Manufacturer in India
ASME B16.9 SR Elbows are typically produced with a 90-degree angle. Compared to long radius elbows, they create sharper turns, making them ideal for specific applications. These fittings are manufactured under the guidelines of the American Society of Mechanical Engineers (ASME), which ensures strict quality control over aspects like pressure rating, marking, dimensions, surface finish, tolerances, and testing procedures.
Adhering to the ASME B16.9 standards guarantees reliability and consistency in the performance of pipe fittings.
SR Elbow Specifications
Short Radius Elbow Size
Seamless Elbow: 1/2 to 24 inches
Welded Elbow: 1/2 to 48 inches
ASME B16.9 Short Radius Elbow Manufacturing Type
Seamless
Welded
ERW
Fabricated
Wall Thickness
Schedule 5S to 160
Dimension Standards
ASME B16.9
MSS-SP-43
ASME B16.28
Type
90 Degrees
45 Degrees
180 Degrees
1D
3D
5D
Material of 45 Degree SR Elbow
Stainless Steel
Duplex & Super Duplex Steel
Carbon Steel
Alloy Steel
Nickel Alloy
3/8 NPT Street Elbow Certificates
MTC EN 10204 3.1/3.2
100% Radiography Test Report
Raw Materials Certificate
Third Party Inspection Report
NACE MR0175
NACE TM-0284
NACE MR0103
ISO 15156
Origin of 3/4 Street Elbow
Japan
Korea
India
Russia
Ukraine
USA
Europe
45 Deg SR Elbow Pressure Class
150# to 2500#
Connection Type
Threaded
Weld
Clamp End
Short Radius Elbow Standard
EN
DIN
ASTM
ASME
JIS
Manufacturing Method
Pressing
Hot Forming
Hamming
Flat Rolling
Pipe Rolling
Shape Rolling
Hot Mandrel Bending
Piercing
Thickness Tolerance
+/-12.5%
90 Degree SR Elbow Testing
Ultrasonic Test
PMI
HIC Tested
MT
Short Radius 90 Degree Elbow Dimensions
NPS in Inch
Center to End
B
Outer Diameter
D
1
25
33.4
1¼
32
42.2
1½
38
48.3
2
51
60.3
2½
64
73
3
76
88.9
3½
89
101.6
4
102
114.3
5
127
141.3
6
152
168.3
8
203
219.1
10
254
273
12
305
323.8
14
356
355.6
16
406
406.4
18
457
457
20
508
508
22
559
559
24
610
610
Short Radius Reducing Elbows are Manufactured in Sizes from 1/2 to 48 Inches
The extensive size range of short radius reducing elbows allows seamless integration among various pipe diameters within a piping system. This capability facilitates efficient fluid flow by minimizing restrictions and ensuring smooth transitions between different pipe sizes, which is crucial for both plumbing and industrial applications.
The following table provides the dimensional specifications of short radius elbows:
45 Degree SR Elbow Dimensions
NPS in Inch
Outer Diameter
D
45°
3D
Center to End
A
45°
SR
Center to End
A
1/2
21.3
–
38
1
33.4
76
38
1½
48.3
114
57
2
60.3
152
76
3
88.9
229
114
4
114.3
305
152
6
168.3
457
229
10
273
762
381
14
355.6
1067
533
18
457
1372
686
22
559
1676
838
26
660
1981
991
30
762
2286
1143
34
864
2591
1295
38
965
2896
1448
42
1067
3200
1600
44
1118
3353
1676
46
1168
3505
1753
48
1219
3658
1829
ASME B16.9 Short Radius Elbow Dimensions in Inches
Nominal Size
OD at Bevel
Center to End
in.
A
in.
1
1.32
1
1 1/4
1.66
1.25
1 1/2
1.90
1.50
2
2.38
2
2 1/2
2.88
2.50
3
3.50
3
3 1/2
4
3.50
4
4.50
4
5
5.56
5
6
6.62
6
8
8.62
8
10
10.75
10
12
12.75
12
14
14
14
16
16
16
18
18
18
20
20
20
22
22
22
24
24
24
In SR Elbows, the Radius is Equal to the Pipe Diameter (R=D)
This design feature results in a compact bend that promotes efficient fluid flow redirection in piping systems. By maintaining the same radius as the pipe diameter, these elbows reduce the need for additional fittings and ensure smooth transitions between connected sections of piping.
Short Radius Elbow Formula
90 Degree Short Radius Elbows are Ideal for Situations Requiring Sharp Corners
These elbows feature a compact curve, making them suitable for installations with limited space or where rapid directional changes are needed. They minimize the overall length of the piping run, which is particularly advantageous in confined spaces or tight installations.
Applications of SS Short Radius Elbows
Oil and Gas Pipelines
Water Supply Systems
Chemical Industry
Power Plants
Industrial Fabrication
Structural Piping
Paper and Pulp Industry
Food Processing Industry
45 Degree SR Elbows Cause Relatively Higher Pressure Drops Compared to Long Radius Elbows
Due to increased friction losses, 45 Degree SR Elbows do not offer as smooth a fluid flow as long radius elbows. Consequently, they are less common but still find use in situations where flow rates are less critical, such as in long-distance fluid transport or where multiple directional changes are necessary. Additionally, they are often utilized in setups requiring substantial pumping equipment.
