As its name suggests, short radius elbows are significantly more compact in size compared to their counterparts. Specifically, these elbows have a bend radius equal to the diameter of the pipe itself. Due to their unique design, they aren't commonly used in high-pressure pipeline systems. Instead, they're typically employed in low-pressure fluid applications or situations where space is constrained during installation.
Table of Contents
Specification of SR Elbows
Dimensions of 90 Degree Short Radius Elbows
45 Degree SR Elbow Dimensions
ASME B16.9 Short Radius Elbow Dimensions in Inches
Formula for Short Radius Elbows
Applications of SS Short Radius Elbows
Comparison: Long Radius vs Short Radius Elbows
Weight Chart for 90 Degree Short Radius Elbows
Types of Short Radius Elbows
Tolerances for Inconel Buttweld SR Elbows
Marking for Nickel Alloy Buttweld SR Elbows
Materials and Grades for ANSI B16.9 SR Elbow Fittings
ASME B16.9 SR Elbow Manufacturer in India
ASME B16.9 SR Elbows are predominantly produced with a 90-degree angle. This design allows for much sharper turns compared to long radius elbows. These fittings are manufactured under the guidelines of the American Society of Mechanical Engineers (ASME), which ensures strict adherence to quality control measures regarding aspects like pressure ratings, dimensions, surface coatings, tolerances, testing, and more.
Adhering to the standards set by ASME B16.9 guarantees reliability and durability in pipe fittings.
Specification of SR Elbows
Short Radius Elbow Size
Seamless Elbow: 1/2 to 24 inch
Welded Elbow: 1/2 to 48 inch
ASME B16.9 Short Radius Elbow Manufacturing Type
Seamless
Welded
ERW
Fabricated
Thickness
Schedule 5S to 160
Dimensions Standard
ASME B16.9
MSS-SP-43
ASME B16.28
Type
90 Degree
45 Degree
180 Degree
1D
3D
5D
Short Radius Elbow 45 Degree Material
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
3/4 Street Elbow Origin
Japanese
Korean
Indian
Russian
Ukraine
USA
European
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 a size range of 1/2 to 48 inches
The extensive size range of short radius reducing elbows provides seamless integration among various pipe diameters within a piping system. This 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 outlines 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 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 identical to the pipe diameter (R=D)
This feature provides a compact and efficient transition for fluid flow direction in piping systems. The same-radius design minimizes additional steps needed to connect the elbow, ensuring smooth flow between the pipe and the short radius elbow.
Short Radius Elbow Formula
90-degree short radius elbows are ideal for applications requiring relatively sharp corners.
With its compact curvature, this elbow type is particularly useful when space is limited, such as when crossing obstacles or when the piping system must quickly change direction. By reducing the overall length of the piping run, it's especially valuable for compressed installations.
Applications of SS Short Radius Elbows
Oil and Gas Pipelines
Water Supply Systems
Chemical Industry
Power Plants
Industrial Fabrication
Structural Pipes
Paper and Pulp Industry
Food Processing Industry
45-degree short radius elbows experience greater pressure drops compared to long radius elbows.
This results in less smooth fluid flow, making them less popular despite being suitable for applications where flow rate isn't critical, such as long-distance fluid transport or where multiple directional changes are required. Additionally, they are used in setups where large pumping equipment is installed.
Comparison: Long Radius vs Short Radius Elbows
Description
Long Radius
Short Radius Elbow
Size
1.5 times greater diameter
Same as pipe diameter
Bend radius
Larger
Smaller
Shape
Flatter
More compact
Appearance
Curved curve
Sharper curve
Flow resistance
Lower resistance
Higher resistance
Effects on fluid flow
Smooth fluid flow
Turbulent flow
Applications
Chemical industry, oil and gas industries
Where turbulent flow is acceptable
Advantages
Heavier than short radius
Lighter than long radius
Cost
More expensive than short radius
Less expensive than long radius
Pressure Loss
Higher
Lower
90 Degree Short Radius Elbow Weight Chart
NPS
Weight In Kilogram
1/2
.08
1
.18
1 1/2
.41
2
.73
3
2.27
4
4.08
6
11.11
10
39.92
14
72.57
18
117.93
22
178.72
26
249.48
36
481.72
Types of Short Radius Elbows
Short Radius 90 Degree Elbow
45 Degree SR Elbow
3D Short Radius Elbows
ASME B16.9 5D Short Radius Elbow
Buttweld Short Radius Pipe Elbow
1.5D Schedule 10 SR Elbows
Tolerances for Inconel Buttweld SR Elbows
NPS
32 to 48
26 to 30
20 to 24
10 to 18
OD
at Bevel (D)
+ 6.4
– 4.8
+ 6.4
– 4.8
+ 6.4
– 4.8
+ 4
– 3.2
ID at End
4.8
3.2
Center to End 3D (A/B)
6
6
3
3
Center to End LR (A/B)
5
3
2
2
NPS
5 to 8
4
3 to 3.1/2
1/2 to 2.1/2
OD
at Bevel (D)
+ 2.4
– 1.6
1.6
1.6
+ 1.6
– .8
ID at End
1.6
.8
Center to End 3D (A/B)
3
3
3
3
Center to End LR (A/B)
2
2
2
2
Marking for Nickel Alloy Buttweld SR Elbows
Materials and Grades for ANSI B16.9 SR Elbow Fittings
