Welcome to Moksh Tubes & Fittings LLP

Monday - friday : 8:00 AM to 7:00 Pm

+91 97695 84950

info@mokshtubes.com

+91 97695 84950

info@mokshtubes.com

Contact Us

Industrial U-Bent Tubes for High-Performance Applications

U-Bent Tubes

U-Bent Tubes

U-Bent Tubes are specially fabricated tubes designed for efficient heat transfer in compact heat exchanger systems. They are bent into a “U” shape to allow the fluid to flow in a reverse direction without requiring separate return piping, thereby saving space and enhancing heat recovery performance.

Moksh Tubes & Fittings LLP, we supply precision-engineered U-Bent Tubes in stainless steel, carbon steel, alloy steel, and nickel alloys. These tubes are widely used in boilers, condensers, and heat exchangers across power, petrochemical, and process industries. All tubes are produced and bent under strict quality control to ensure dimensional accuracy and structural integrity.

Specifications

Category Details
Material Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Nickel Alloys
Grades ASTM A179, A192, A210, A213, A268, A556, EN10216-2, BS 3059, ASME SA213
Outer Diameter (OD) 6 mm to 76.2 mm
Wall Thickness 0.5 mm to 8 mm (as per design requirements)
Lengths Up to 12 meters (or as per specification)
Bend Radius Minimum 1.5 x OD or as per customer drawing
Finishes Bright Annealed, Pickled, Polished, Passivated
Type Seamless / Welded
Form U-Bent Form with Straight Leg Extensions

Charts

Weight Chart

Nominal Bore Chart Outside Diameter (O.D)
(mm)		 Schedule 5C Schedule 10C Schedule 40C Schedule 80C Schedule 160C Schedule XXC
mm inches Wt Weight Wt Weight Wt Weight Wt Weight Wt Weight Wt Weight
3 1/8 10.3 0.2 0.01 0.3 0.02 0.4 0.03 0.6 0.04 0.8 0.06 1.0 0.07
6 1/4 13.7 0.2 0.02 0.3 0.03 0.4 0.04 0.6 0.06 0.8 0.08 1.0 0.10
10 3/8 17.1 0.2 0.03 0.3 0.04 0.4 0.06 0.6 0.08 0.8 0.11 1.0 0.14
15 1/2 21.3 0.2 0.04 0.3 0.06 0.4 0.08 0.6 0.12 0.8 0.16 1.0 0.20
20 3/4 26.7 0.2 0.06 0.3 0.09 0.4 0.12 0.6 0.17 0.8 0.22 1.0 0.28
25 1 33.4 0.2 0.08 0.3 0.12 0.4 0.17 0.6 0.25 0.8 0.33 1.0 0.41
32 1 1/4 42.2 0.2 0.13 0.3 0.19 0.4 0.26 0.6 0.38 0.8 0.50 1.0 0.62
40 1 1/2 48.3 0.2 0.16 0.3 0.24 0.4 0.32 0.6 0.48 0.8 0.63 1.0 0.78
50 2 60.3 0.2 0.24 0.3 0.36 0.4 0.47 0.6 0.70 0.8 0.93 1.0 1.17
65 2 1/2 73.0 0.2 0.33 0.3 0.49 0.4 0.65 0.6 0.97 0.8 1.29 1.0 1.63
80 3 88.9 0.2 0.47 0.3 0.70 0.4 0.93 0.6 1.40 0.8 1.87 1.0 2.36
100 4 114.3 0.2 0.77 0.3 1.14 0.4 1.52 0.6 2.27 0.8 3.04 1.0 3.82
125 5 141.3 0.2 1.17 0.3 1.72 0.4 2.30 0.6 3.42 0.8 4.58 1.0 5.76
150 6 168.3 0.2 1.63 0.3 2.41 0.4 3.23 0.6 4.79 0.8 6.38 1.0 8.02
200 8 219.1 0.2 2.73 0.3 4.03 0.4 5.40 0.6 8.01 0.8 10.65 1.0 13.33
250 10 273.1 0.2 4.17 0.3 6.15 0.4 8.23 0.6 12.23 0.8 16.27 1.0 20.35
300 12 323.9 0.2 5.94 0.3 8.76 0.4 11.71 0.6 17.45 0.8 23.23 1.0 29.05
350 14 355.6 0.2 7.21 0.3 10.63 0.4 14.23 0.6 21.20 0.8 28.26 1.0 35.35
400 16 406.4 0.2 9.29 0.3 13.70 0.4 18.35 0.6 27.37 0.8 36.46 1.0 45.59
450 18 457.2 0.2 11.52 0.3 17.00 0.4 22.78 0.6 34.00 0.8 45.33 1.0 56.70
500 20 508.0 0.2 13.88 0.3 20.50 0.4 27.50 0.6 41.10 0.8 54.75 1.0 68.45
600 24 609.6 0.2 18.93 0.3 28.00 0.4 37.50 0.6 56.05 0.8 74.68 1.0 93.95

Size Charts

Schedule 5C – Size Chart (ASME B36.10)

NPS (inches) NB (mm) OD (mm) Wall Thickness (mm) Internal Diameter (mm) Weight (kg/m)
1/2 15 21.3 1.65 18.0 0.84
3/4 20 26.7 1.65 23.4 1.03
1 25 33.4 1.65 30.1 1.3
1 1/4 32 42.2 1.65 38.9 1.65
1 1/2 40 48.3 1.65 44.9 1.91
2 50 60.3 1.65 56.0 2.4
2 1/2 65 73.0 2.11 68.8 3.69
3 80 88.9 2.11 84.7 4.51
4 100 114.3 2.11 110.1 5.84
5 125 141.3 2.77 135.8 9.47
6 150 168.3 2.77 162.8 11.32
8 200 219.1 2.77 213.6 14.79
10 250 273.1 3.4 266.3 22.63
12 300 323.9 3.56 317.0 31.25
14 350 355.6 3.96 347.7 36.96
16 400 406.4 4.19 398.0 41.56
18 450 457.2 4.57 448.1 49.42
20 500 508.0 5.54 496.9 59.25
22 550 558.8 5.54 547.7 65.97
24 600 609.6 5.54 598.5 82.47

Schedule 10C – Size Chart (ASME B36.10)

NPS (inches) NB (mm) OD (mm) Wall Thickness (mm) Internal Diameter (mm) Weight (kg/m)
1/2 15 21.3 2.11 17.1 1.04
3/4 20 26.7 2.11 22.5 1.37
1 25 33.4 2.77 27.9 2.17
1 1/4 32 42.2 2.77 36.7 2.8
1 1/2 40 48.3 2.77 42.8 3.25
2 50 60.3 2.77 54.8 4.12
2 1/2 65 73.0 3.05 66.9 5.6
3 80 88.9 3.05 82.8 6.9
4 100 114.3 3.05 108.2 9.01
5 125 141.3 3.4 134.5 12.28
6 150 168.3 3.4 161.5 14.69
8 200 219.1 3.76 211.6 20.25
10 250 273.1 4.19 264.7 27.86
12 300 323.9 4.57 314.8 36.27
14 350 355.6 4.78 346.0 41.15
16 400 406.4 4.78 396.8 47.14
18 450 457.2 4.78 447.6 53.05
20 500 508.0 5.54 496.9 66.75
22 550 558.8 5.54 547.7 73.46
24 600 609.6 6.35 596.9 86.78

Schedule 40C – Size Chart (ASME B36.10)

NPS (inches) NB (mm) OD (mm) Wall Thickness (mm) Internal Diameter (mm) Weight (kg/m)
1/8 3 10.3 1.73 6.84 0.37
1/4 6 13.7 2.24 9.22 0.84
1/2 15 21.3 2.77 15.7 1.27
3/4 20 26.7 2.87 21.0 1.69
1 25 33.4 3.38 26.6 2.50
1 1/4 32 42.2 3.56 35.1 3.39
1 1/2 40 48.3 3.68 41.0 4.05
2 50 60.3 3.91 52.5 5.44
2 1/2 65 73.0 5.16 62.7 8.63
3 80 88.9 5.49 78.9 11.3
3 1/2 90 101.6 5.74 90.1 13.6
4 100 114.3 6.02 102.3 16.1
5 125 141.3 6.55 128.2 21.8
6 150 168.3 7.11 154.1 28.3
8 200 219.1 8.18 202.7 42.6
10 250 273.0 9.27 254.5 60.3
12 300 323.8 10.31 303.2 79.7
14 350 355.6 11.13 333.4 94.6
16 400 406.4 12.70 381.0 123.3
18 450 457.2 14.27 428.7 155.8
20 500 508.0 15.09 477.8 183.4
24 600 610.0 17.48 575.0 255.4

Schedule 80C – Size Chart (ASME B36.19)

NPS (inches) NB (mm) OD (mm) Wall Thickness (mm) Internal Diameter (mm) Weight (kg/m)
1/8 3 10.3 2.41 5.48 0.47
1/4 6 13.7 3.02 7.66 1.06
1/2 15 21.3 3.73 13.84 1.61
3/4 20 26.7 3.91 18.88 2.34
1 25 33.4 4.55 24.3 3.37
1 1/4 32 42.2 4.85 32.5 4.66
1 1/2 40 48.3 5.08 38.1 5.57
2 50 60.3 5.54 49.2 7.57
2 1/2 65 73.0 7.01 59.0 11.3
3 80 88.9 7.62 73.7 15.7
3 1/2 90 101.6 8.08 85.4 19.1
4 100 114.3 8.56 97.2 23.0
5 125 141.3 9.53 122.2 31.4
6 150 168.3 10.97 146.4 41.5
8 200 219.1 12.70 193.7 63.6
10 250 273.1 15.09 243.0 93.2
12 300 323.9 17.48 288.9 124.3
14 350 355.6 19.05 317.5 147.2
16 400 406.4 21.44 363.5 185.5
18 450 457.2 23.83 409.5 227.6
20 500 508.0 26.19 455.6 276.5
24 600 609.6 28.58 552.4 366.3

Schedule 160C – Size Chart (ASME B36.10)

NPS (inches) NB (mm) OD (mm) Wall Thickness (mm) Internal Diameter (mm) Weight (kg/m)
1/2 15 21.3 4.78 11.7 1.97
3/4 20 26.7 5.56 15.6 3.09
1 25 33.4 6.35 20.7 4.56
1 1/4 32 42.2 6.35 29.5 6.09
1 1/2 40 48.3 7.14 34.0 7.89
2 50 60.3 8.74 42.8 11.5
2 1/2 65 73.0 9.53 53.9 15.9
3 80 88.9 11.13 66.6 22.1
4 100 114.3 13.49 87.3 34.3
5 125 141.3 15.88 109.5 49.1
6 150 168.3 18.26 131.8 66.9
8 200 219.1 23.01 173.1 108.9
10 250 273.1 28.58 216.0 168.6
12 300 323.9 33.32 257.3 240.4

Schedule XXC – Size Chart (ASME B36.10)

NPS (inches) NB (mm) OD (mm) Wall Thickness (mm) Internal Diameter (mm) Weight (kg/m)
1/2 15 21.3 7.47 6.36 2.86
3/4 20 26.7 7.82 11.06 4.46
1 25 33.4 9.09 15.22 6.56
1 1/4 32 42.2 9.70 22.80 9.45
1 1/2 40 48.3 10.15 28.00 11.3
2 50 60.3 11.07 38.16 15.3
2 1/2 65 73.0 14.02 44.96 23.3
3 80 88.9 15.24 58.42 30.8
4 100 114.3 17.12 80.06 44.1
5 125 141.3 19.05 103.2 62.5
6 150 168.3 21.95 124.4 84.7
8 200 219.1 25.40 168.3 122.6
10 250 273.1 31.75 209.6 184.8
12 300 323.9 38.10 247.7 260.5

Grades Available

U-Bent Tubes are available in a wide range of grades:

Material Grades
Carbon Steel ASTM A179, A192, A210 Gr A1/C
Alloy Steel ASTM A213 T11, T12, T22, T91, T5, T9
Stainless Steel TP304, 304L, 316, 316L, 321, 347, 310, 904L
Duplex / Super Duplex UNS S31803, S32205, S32750, S32760
Nickel Alloys Inconel 600, 625, 800, 825, Monel 400, Hastelloy C22, C276, Alloy 20
NICKLE ALLOYS
NICKLE ALLOYS
STAINLESS STEEL
STAINLESS STEEL
DUPLEX & SUPER
DUPLEX & SUPER
TITANIUM ALLOYS
TITANIUM ALLOYS
RARE TO ALLOYS
RARE TO ALLOYS
CARBON ALLOYS
CARBON ALLOYS

Applications

U-Bent Tubes are essential in thermal systems where compactness, efficiency, and heat transfer performance are required:

Heat Exchangers
  • Shell & Tube type for petrochemical plants and refineries
Boilers & Superheaters
  • For return fluid and steam generation loops
Condensers & Economizers
  • Used in power generation systems and HRSGs
Chemical & Fertilizer Plants
  • Urea, ammonia, and nitric acid production systems
Desalination Plants
  • Thermal distillation and brine concentration units
HVAC & Refrigeration Systems
  • Compact heat exchange coils

Uses of Welded U-Bent Tubes

U-Bent Tubes are used extensively across multiple industries, including:

Piping System Optimization

Reduces the need for pipe fittings and welding joints

Compact Thermal Design

Ensures compact design for thermal systems

High-Pressure Reliability

Enhances mechanical strength in high-pressure loops

Uniform Heat Distribution

Maintains uniform heat distribution across thermal networks

Efficient Flow Management

Minimizes pressure drop and turbulence in flow systems

Versatile System Integration

Supports integration into diverse thermal and fluid systems with ease

Advantages of U-Bent Tubes

Space Saving Design

Ideal for compact heat exchanger layouts

High Heat Transfer Efficiency

Smooth ID and accurate bending

Pressure & Temperature Resistance

Engineered for demanding applications

Dimensional Precision

CNC-controlled bending, minimal ovality and thinning

Corrosion Resistance

Suitable for harsh and acidic process environments

WHY CHOOSE US?

Precision Bending: CNC and mandrel bending with exact tolerances
Wide Material Range: From carbon steel to exotic nickel alloys
Third-Party Inspection: TPI and NDT (Eddy current, hydro, PMI, etc.) on request
Cut-to-Length & Bead Removal: End prep available as per design
Certified Assurance: ISO 9001:2015 and international compliance
Prompt Supply: Short lead times and packing suitable for overseas delivery