180 deg Returns Bends

OVERVIEW

180 deg Returns Bends

TUBA pride ourselves on being a leading manufacturer, exporter and supplier of a diverse range of custom-made Seamless Buttweld 180° Returns that have been widely appreciated by our clients. The 180 degree Long Radius Elbows are used for connecting pipes of different diameters and find wide applications in various chemicals, construction industries, paper, cement & ship builders.

There are short radius bends as well as long radius ones. The ASME B16.9 standard bends range between ½ inches and 48 inches in the diameter of the bends. The advantage of the 180 degree return bend is that it is in one piece and manages the stress and pressure differences in turning the direction in a completely opposite turn.

We have adopted advanced production equipment to make our 180 degree Long Radius Elbow(1D D711.2～D1219.2), which can not only improve product quality, but also save raw materials.

ANSI/ASME B16.9 180 Degree Return Bends Specifications

Type Butt weld (BW)
Standards ASME / ANSI – B 16.9
ASTM A403 – ASME SA403 – ‘Standard Specification for Wrought Austenitic   Stainless Steel Piping Fittings’
API 590-605
ASME B16.9 – ‘Factory-Made Wrought Buttwelding Fittings’
ASME B16.25 – ‘Buttwelding Ends’
ASME B16.28 – ‘Wrought Steel Buttwelding Long Radius Elbows and   Returns’
MSS SP-43 – ‘Wrought and Fabricated Butt-Welding Fittings for Low   Pressure, Corrosion Resistant Applications’
Dimension ANSI B16.9, ANSI B16.28, MSS-SP-43 Type A, MSS-SP-43 Type B, JIS   B2312, JIS B2313
Thickness Schedule 5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80,   S100, S120, S140, S160, XXS and etc.
Schedule Sch 5 TO Sch XXS.
Size 1/2” TO 36”, (Seamless up to 24”), (Welded 8” TO 36”)

Long Radius 180 Return Bends Dimensions

N.P.S Wall
Thickness		 I.D. Back To Face Pipe
Sch.		 O.D. Center
To Center		 Wgt
Pounds
1/2 0.109 0.622 1.88 40 0.84 3 0.32
3/4 0.113 0.824 1.69 40 1.05 2.25 0.34
1 0.133 1.049 2.19 40 1.31 3 0.74
1 1/4 0.14 1.38 2.75 40 1.66 3.75 1.1
1 1/2 0.145 1.61 3.25 40 1.9 4.5 1.6
2 0.154 2.067 4.19 40 2.38 6 3.2
2 1/2 0.203 2.469 5.19 40 2.88 7.5 6.1
3 0.216 3.068 6.25 40 3.5 9 9.4
3 1/2 0.226 3.548 7.25 40 4 10.5 12.8
4 0.237 4.026 8.25 40 4.5 12 17.5
5 0.258 5.047 10.31 40 5.56 15 29.3
6 0.28 6.065 12.31 40 6.63 18 47
8 0.322 7.981 16.31 40 8.63 24 87
10 0.365 10.02 20.38 40 10.75 30 164
12 0.375 12 24.38 * 12.75 36 237
14 0.375 13.25 28 30 14 42 311
16 0.375 15.25 32 30 16 48 408
18 0.375 17.25 36 * 18 54 514
20 0.375 19.25 40 20 20 60 636
Nominal
Pipe Size		 Wgt
Pounds		 I.D. Wall
Thickness		 O.D. Back To Face Center
To Center		 Pipe
Sch.
1/2 0.45 0.546 0.147 0.84 1.31 3 80
3/4 0.52 0.742 0.154 1.05 1.69 2.25 80
1 0.97 0.957 0.179 1.32 2.12 3 80
1 1/4 1.6 1.28 0.191 1.66 2.75 3.75 80
1 1/2 2.2 1.5 0.2 1.9 3.25 4.5 80
2 4.1 1.94 0.218 2.38 4.12 6 80
2 1/2 7.7 2.32 0.276 2.88 5.12 7.5 80
3 12.4 2.9 0.3 3.5 6.25 9 80
3 1/2 17.1 3.36 0.318 4 7.25 10.5 80
4 24.1 3.83 0.337 4.5 8.25 12 80
5 41.7 4.81 0.375 5.56 10.31 15 80
6 68.2 5.76 0.432 5.76 12.31 18 80
8 140 7.63 0.5 8.63 16.31 24 80
10 217 9.75 0.5 10.75 20.38 30 60
12 311 11.75 0.5 12.75 24.38 36 *
14 400 13 0.5 14 28 42 *
16 540 15 0.5 16 32 48 40
18 686 17 0.5 18 36 54 *
20 840 19 0.5 20 40 60 30
24 1210 23 0.5 24 48 72 *

Short Radius 180 Return Bends Weight

Nominal
Pipe Size		 Pipe
Schedule		 O.D. Center
to Center O		 I.D. Wall
Thickness T		 Weight
Pounds		 Back
to Face K
1 40 1.32 2 1.05 0.133 0.5 1.62
1 1/4 40 1.66 2.5 1.38 0.14 0.8 2.06
1 1/2 40 1.9 3 1.61 0.145 1.1 2.44
2 40 2.38 4 2.07 0.154 1.9 3.19
2 1/2 40 2.88 5 2.47 0.203 4 3.94
3 40 3.5 6 3.07 0.216 6 4.75
3 1/2 40 4 7 3.55 0.226 8.7 5.5
4 40 4.5 8 4.03 0.237 12.2 6.25
5 40 5.56 10 5.05 0.258 19.2 7.75
6 40 6.62 12 6.07 0.28 32.9 9.31
8 40 8.62 16 7.98 0.322 64.9 12.31
10 40 10.75 20 10.02 0.365 112 15.38
12 * 12.75 24 12 0.375 157 18.38
14 30 14 28 13.25 0.375 208 21
16 30 16 32 15.25 0.375 257 24
18 * 18 36 17.25 0.375 325 27
20 20 20 40 19.25 0.375 416 30
24 20 24 48 23.25 0.375 592 36
Nominal
Pipe Size		 O.D. Wall
Thickness T		 I.D. Weight
Pounds		 Back
to Face K		 Center
to Center O
1 1/2 1.9 0.2 1.5 1.5 2.44 3
2 2.37 0.218 1.93 2.9 3.19 4
2 1/2 2.87 0.276 2.32 5.2 3.94 5
3 3.5 0.3 2.9 8.2 4.75 6
3 1/2 4 0.318 3.36 11.7 5.5 7
4 4.5 0.337 3.83 16.4 6.25 8
5 5.56 0.375 4.81 27.7 7.75 10
6 6.62 0.432 5.76 45.7 9 5/16 12
8 8.62 0.5 7.62 96.3 12.31 16
10 10.75 0.5 9.75 143 15.38 20
12 12.75 0.5 11.75 212 18.38 24
14 14 0.5 13 271 21 28
16 16 0.5 15 339 24 32
18 18 0.5 17 425 27 36
20 20 0.5 19 555 30 40
24 24 0.5 23 778 36 48

Technical overview of Long Radius 180 return bends

ND Max off angle Max off plane
Q P
1/2 a 4 1 2
5 a 8 2 4
10 a 12 3 5
14 a 16 3 7
18 a 24 4 10
26 a 30 5 10
32 a 42 5 13
44 a 48 5 20

ASME B16.9 180° Long Radius Elbow Dimensional Tolerance

For all fittings 180° Returns
Nominal Pipe Size (NPS) Outside Ø 
at Bevel		 Inside Ø
at End		 Wall Thickness 
t / t1		 Center to Center Dim.
O		 Back to Face Dim.
K		 Align- ment of Ends
U
1/2 a 2 1/2 1 0,8 Not 7 7 1
3 a 3 1/2 1 1,6 less 7 7 1
4 +2 -1 1,6 than 7 7 1
5 a 6 +3 -1 1,6 87,50% 7 7 1
8 2 1,6 of nominal 7 7 1
10 +4 -3 3,2 thickness 7 7 2
12 a 18 +4 -3 3,2 10 7 2
20 a 24 +6 -5 4,8 10 7 2
26 a 30 +7 -5 4,8 ..... ..... .....
32 a 48 +7 -5 4,8 ..... ..... .....

Manufacturing Standards of Buttweld Bend

ASME B16.9 Buttweld Bend Factory-Made Wrought Buttwelding Fittings Bend, Buttweld Bend, Welded Bend, Butt Weld Bend
ASME B16.28   Bend, Buttweld Bend, Welded Bend, Butt Weld Bend
MSS SP43 Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications Bend, Buttweld Bend, Welded Bend, Butt Weld Bend
MSS SP75   Bend, Buttweld Bend, Welded Bend, Butt Weld Bend

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