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180° Elbow

Size: 1/2"-48"
Wall thickness: SCH5S-SCHXXS
Material: Special Alloy, Super Duplex Stainless Steel, Stainless Steel, Carbon Steel, Titanium
Standards: ASME B16.9, ASME B16.28, MSS SP43, MSS SP75

  • PRODUCT DETAIL
  • Material

Size: 1/2″-48″
Wall thickness: SCH5S-SCHXXS
Material: Special Alloy, Super Duplex Stainless Steel, Stainless Steel, Carbon Steel, Titanium
Standards: ASME B16.9, ASME B16.28, MSS SP43, MSS SP75

180 degree elbow of stainless steel refers to the elbow product whose bending angle reaches 180 degrees. According to its curvature radius, it can be divided into long radius 180 degrees stainless steel elbow and short radius 180 degrees stainless steel elbow. The long radius refers to the outer diameter of the tube whose curvature radius is equal to 1.5 times, that is, R = 1.5D. Short radius elbow refers to its curvature radius equal to the outside diameter of the pipe, that is, R = 1.0D, (R is the radius, D is the diameter of the elbow). Of course, different 180 degree stainless steel elbows can also be customized according to different curvature radius.
In the pipeline system layout, it is generally appropriate to use long radius elbow connection, short radius elbow is usually used in the pipeline installation location is more compact occasions or in order to reduce costs. When using short radius elbow, its working pressure should not exceed 0.8 times of long radius elbow of the same specification.

BUTTWELD ELBOW 45/90/180 DEGREE

ASME B16.9 buttweld elbows are manufactured in a wide range of dimensions (combinations of outside diameter and wall thickness) to fit ASME B36.10 and ASME B36.19 carbon, alloy and stainless steel pipes of any size between 2 and 48 inches (and above).

Buttweld elbows below 24 inches in diameter are produced by cutting, heating and bending seamless steel pipes; pipe elbows of larger sizes are manufactured, instead, from welded pipes or steel plates. 

The three most common types of elbows in piping are the 45, 90, and 180 degrees (or return elbow), as shown in the image:

Types of elbows in piping
Some special types of pipe elbows are:

  • reducing elbow: a pipe connector with an inlet and an outlet in two different bore sizes is used instead of the combination of a standard elbow and concentric reducer.
  • mitered elbow: large size elbow assembled by joining steel plates

reducing elbow

SHORT VS LONG RADIUS ELBOW

Elbows are split into two groups which define the distance over which they change direction; the center line of one end to the opposite face. This is known as the “center to face” distance and is equivalent to the radius through which the elbow is bent.
The center to face distance for a “long” radius elbow, abbreviated LR always is “1.1/2 x Nominal Pipe Size (NPS) (1.1/2D)”, while the center to face distance for a “short” radius elbow, abbreviated SR even is to nominal pipe size.

Here below, for example, you will find the
center to face distance of NPS 2 elbows
(the A distance on the image)

  1. 90°-LR : = 1.1/2 x 2(NPS) x 25.4 A=76.2 mm
  2. 180°-LR : = 2 times the 90° LR elbow A=152.4 mm
  3. 90°-SR : = 2(NPS) x 25.4 A=50.8 mm
  4. 180°-SR : = 2 times the 90° SR elbow A=101.6 mm

Butt Weld Elbow

3D elbows as an example, are calculated with:
3(D) X 2(NPS) X 25.4

PIPE ELBOW MANUFACTURING PROCESS

Buttweld elbows 180 degrees can be manufactured in different ways, the main ones are the “mandrel process” and the “cold forming” (other methods are the elliptical forming and the double-seam welding method).

Mandrel Process

Pipe Elbow Manufcturing Process (Mandrel Process)

Cold forming

Elbow manufacturing process (Cold forming method)

Elliptical Forming

Elliptical Forming

Two Seam Welding Method

Two Seam Welding Method

Quality Control
We have our own Physical & Chemical Testing Center Lab to guarantee our product quality. Our test items & instrument fully meet international standards.

Charpy impact test
Charpy impact test
Corrosion test
Corrosion test
PT penetration inspection
PT penetration inspection
Tensile test
Tensile test
Ultrasonic wt testing
Ultrasonic wt testing
Hardness test
Hardness test
Dimension test
Dimension test
High test
High test
Thickness test
Thickness test
PMI portable spectrometer
Alloy Analyzer (PMI)


Application of 180° Elbow

  1. Pipe and Tubes for petrochemical industry
  2. Pharmaceutical industry 
  3. Food industry
  4. Aviation and aerospace industry
  5. Architectural decoration industry
  6. Oil and Gas Pipeline industry

Dimensions Butt Weld Elbows 180° LR and SR ASME B16.9

Dimensions Butt Weld Elbows 180° LR and SR ASME B16.9
NPS O.D.
D
180° Long Rad 180° Short Rad
Center to
Center
O
Back to
Face
K
Center to
Center
O
Back to
Face
K
1/2 21.3 76 48    
3/4 26.7 76 51    
1 33.4 76 56 51 41
1.1/4 42.2 95 70 64 52
1.1/2 48.3 114 83 76 62
2 60.3 152 106 102 81
2.1/2 73 190 132 127 100
3 88.9 229 159 152 121
3.1/2 101.6 267 184 178 140
4 114.3 305 210 203 159
5 141.3 381 262 254 197
Dimensions Butt Weld Elbows 180° LR and SR ASME B16.9
NPS O.D.
D
180° Long Rad 180° Short Rad
Center to
Center
O
Back to
Face
K
Center to
Center
O
Back to
Face
K
6 168.3 457 313 305 237
8 219.1 610 414 406 313
10 273 762 518 508 391
12 323.8 914 619 610 467
14 355.6 1067 711 711 533
16 406.4 1219 813 813 610
18 457 1372 914 914 686
20 508 1524 1016 1016 762
22 559 1676 1118 1118 838
24 610 1829 1219 1219 914

Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer.

DIMENSIONAL TOLERANCES OF BUTT WELD ELBOWS 180° LR AND SR ASME B16.9

Nominal Pipe Size 1/2 to 2.1/2 3 to 3.1/2 4
Outside Diameter
at Bevel (D)
+ 1.6
– 0.8
1.6 1.6
Inside Diameter at End 0.8 1.6 1.6
Center to Center (O) 6 6 6
Back to Face (K) 6 6 6
Nominal Pipe Size 5 to 8 10 to 18 20 to 24
Outside Diameter
at Bevel (D)
+ 2.4
– 1.6
+ 4
– 3.2
+ 6.4
– 4.8
Inside Diameter at End 1.6 3.2 4.8
Center to Center (O) 6 10 10
Back to Face (K) 6 6 6
Wall Thickness (t) Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted.

Note:
MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Source: Werner Sölken

Summary
product image
Aggregate Rating
5 based on 1 votes
Brand Name
Acero
Product Name
180° Elbow
Price
USD 999
Product Availability
Available in Stock

Material

Special Alloys

  • HASTELLOY® X
  • MONEL® R-405
  • MONEL® K-500
  • HASTELLOY® C-276
  • HASTELLOY® C-22
  • HASTELLOY® B-2
  • INCOLOY® 825
  • INCOLOY® 800H / 800HT®
  • INCONEL® 718
  • INCONEL® ALLOY 625
  • INCONEL® ALLOY 601
  • INCONEL® ALLOY 600
  • MONEL® ALLOY 400

ALLOY 20

  • NICKEL 200/201
  • MONEL® R-405
  • MONEL® K-500
  • MONEL® ALLOY 400
  • INCONEL® 718
  • INCONEL® ALLOY 625
  • INCONEL® ALLOY 601
  • INCONEL® ALLOY 600
  • INCOLOY® 825
  • HASTELLOY® X
  • HASTELLOY® C-276
  • HASTELLOY® C-22
  • HASTELLOY® B-2
  • INCOLOY® 800H / 800HT®
  • HASTELLOY® B-3

Duplex Stainless Steel

  • ZERON® 100, SUPER DUPLEX STAINLESS STEEL
  • Super Duplex S32760
  • LDX 2101®, DUPLEX STEEL
  • Duplex S31803
  • SUPER DUPLEX 2507
  • DUPLEX 2205

Stainless Steel

  • STAINLESS STEEL NITRONIC 50HS
  • STAINLESS STEEL NITRONIC 60
  • STAINLESS STEEL NITRONIC 50
  • STAINLESS STEEL 13-8PH
  • STAINLESS STEEL 15-5PH
  • STAINLESS STEEL PRODEC 303
  • STAINLESS STEEL 303
  • STAINLESS STEEL 446
  • STAINLESS STEEL 410S
  • STAINLESS STEEL 410
  • STAINLESS STEEL 304-304H
  • STAINLESS STEEL 17-4
  • STAINLESS STEEL 347
  • STAINLESS STEEL 440C
  • STAINLESS STEEL 309
  • STAINLESS STEEL 316-316l
  • STAINLESS STEEL AL-6XN®
  • STAINLESS STEEL 330
  • STAINLESS STEEL 321
  • 317L STAINLESS STEEL
  • STAINLESS STEEL 310/310S
  • Stainless Steel 304L
  • Stainless Steel 304
  • STAINLESS STEEL 253 MA

Carbon Steel

  • CARBON STEEL PRODUCTS

Titanium

  • 10V-2Fe-3Al
  • 6Al-4V
  • 6Al-4V STA
  • 6Al-4V ELI
  • 6Al-2Sn-4Zr-2Mo

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