U bend tube

U Bend tube heat exchangers designed for high temperature applications, especially steam condensing or hot oil systems.

Each U bend tube of our range is rigorously quality checked by our team of talented professionals on every stage of production to deliver the clients defect free best quality products.

Measuring, Cutting, Deburring and Cleaning

We bring forth an exclusive range of U-bend tubes, which are known for their superior quality and excellent functionality.

U bend tube process

After U bend (cold forming), heat treatment of bending portion may be required. Temperature is controlled through the entire heat treated area by fixed and portable infrared pyrometers.

Standard for U bend tube

The semi-finished product for U bend tubes are heat exchanger tubes, manufactured and supplied according to DIN 28180 and ASTM A179.

Tubes for heat exchangers are made of steel according to:

Standard Application
ASTM A179 Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes
ASTM A192 Seamless Carbon Steel Boiler Tubes for High-Pressure Service
ASTM A210 Seamless Medium-Carbon Steel Boiler and Superheater Tubes
ASTM A213 seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM A334 Seamless Steel Pipe for Low-Temperature Service and other Applications with Required Notch Toughness

Chemical Composition and Mechanical Properties (Part)

Standard Grade Chemical Components (%) Mechanical Properties
C Si Mn P S Mo Cr V T.S.  (Mpa) Y.S.  (Mpa) E.L.
(%)
Hardness
(HRB)
ASME SA179 SA179 0.06-0.18 / 0.27-0.63 ≤0.035 ≤0.035 / / / ≥325 ≥180 ≥35 ≤72
ASME SA192 SA192 0.06-0.18 ≤0.25 0.27-0.63 ≤0.035 ≤0.035 / / / ≥325 ≥180 ≥35 ≤77
ASME SA210 A1 ≤0.27 ≥0.10 ≤0.93 ≤0.035 ≤0.035 / / / ≥415 ≥255 ≥30 ≤79
C ≤0.35 ≥0.10 0.29-1.06 ≤0.035 ≤0.035 / / / ≥485 ≥275 ≥30 ≤89
ASTM A333 /A334 GR.1 ≤0.30 / 0.4-1.06 ≤0.025 ≤0.025 / / / ≥380 ≥205 ≥35 -45°
GR.6 ≤0.30 ≥0.10 0.29-1.06 ≤0.025 ≤0.025 / / / ≥415 ≥240 ≥30 -45°
GR.8 ≤0.13 0.13-0.32 ≤0.90 ≤0.025 ≤0.025 / / 8.40-9.60 ≥690 ≥515 ≥22 -195°

U bend tubes for heat exchangers applied mostly in oil and gas plants, chemical and petrochemical plants, refineries, power plants and renewable energy plants. Low fin tubes can be supplied in the form of U bends.

U-Bend Fabrication Tolerances

U-bend tubes are widely used in heat-exchanger systems. Heat-exchanger equipment on the basis of seamless stainless U-tubes is essential in strategically important and critical fields — nuclear and petrochemical machine building.

U bend tube drawing
Item Condition (when) Tolercance
 Ovality   Nominal bend radius ≤ 2 x nominal OD less than or equal to 12%
2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD less than or equal to 10%
Nominal bend radius > 4 x nominal OD  less than or equal to 5%
Nominal bend radius ≤ 2 x nominal OD 0.75 x nominal wall
Mimimum wall thickness   2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD 0.8 x nominal wall
Nominal bend radius > 4 x nominal OD 0.9 x nominal wall
Nominal bend radius ≤ 8" (200mm) +/-3/64"(1mm)
Bending Radius  8" (200mm) < Nominal bend radius ≤ 16" (400mm) +/-1/16"(1mm)
Nominal bend radius >16" (400mm) +/-5/64"(1mm)
Disrance between legs   Max 1/16"(1.5mm)
Wall thinning of bending area   Max 17%
Difference between leg lengths at the ends Leg length ≤ 16' (4.88m) +1/8"(3mm)
Leg length > 16' (4.88m) +3/16"(5mm)
Deviation from plane of bend   ≤ 3/16"(1.5mm)
Flattening on bend   ≤ 10% nominal diameter
Straight leg length ≤5m +1/8"(3mm)
>5m +3/16(5mm)
Total tube length including radius ≤6m +3/16(5mm)
>6m +5/16"(8mm)

Material

‘U’ bends are produced, controlled and measured fully in accordance with relevant standards.

U-bend tubes, also known as U-bent tubes or U-shaped tubes, are typically made from a variety of materials depending on the specific application and industry requirements. The choice of material for U-bend tubes is crucial because it impacts factors such as corrosion resistance, heat resistance, and overall durability. Common materials used for U-bend tubes include:

U bend tube drawing
Material Grade
Carbon Steel SA 179 / A 179
Carbon Steel SA 210 / A 210
Carbon Steel SA 334 / A 334
Stainless Steel SA 213 / A 213
Duplex Stainless Steel SA 789 / A 789
  1. Carbon Steel: Carbon steel U-bend tubes are cost-effective and suitable for applications where corrosion resistance is not a primary concern. They are commonly used in low to moderate-temperature systems.

  2. Stainless Steel: Stainless steel U-bend tubes are known for their excellent corrosion resistance, making them suitable for applications where exposure to corrosive environments or high temperatures is a concern. Different grades of stainless steel, such as 304, 316, and 321, can be used depending on the specific requirements.

  3. Copper and Copper Alloys: Copper U-bend tubes are excellent conductors of heat and electricity. They are often used in applications like HVAC systems and refrigeration due to their high thermal conductivity.

  4. Aluminum: Aluminum U-bend tubes are lightweight and have good thermal conductivity. They are used in various heat exchange applications, including automotive radiators and air conditioning systems.

  5. Inconel: Inconel U-bend tubes are known for their high-temperature strength and corrosion resistance, making them suitable for applications in extreme environments, such as aerospace and chemical processing.

  6. Titanium: Titanium U-bend tubes offer exceptional corrosion resistance, especially in highly corrosive environments. They are used in industries like chemical processing and marine applications.

The material selection for U-bend tubes depends on factors like temperature, pressure, the nature of the fluid or gas being transported, and the specific requirements of the system. It's essential to choose the right material to ensure the longevity and performance of the U-bend tube in its intended application.

What are the uses of U bend tube?

U-bend tubes are used to transfer heat between fluids. They can return the flow of coolants/fluids at 180 degrees in a much smaller space.

The common application fields are: heat exchangers (condensers, evaporators, sea water desalinators) chemical and petrochemical industries. food processing and refrigeration industries.

Heat exchanger animation

Heat-exchanger equipment on the basis of seamless stainless U-tubes is essential in strategically important and critical fields — nuclear and petrochemical machine building.

"U bend tubes for heat exchangers applied mostly in Oil & Gas plants, Chemical & Petrochemical plants, Refineries, Power plants, Renewable energy plants."

  • Object medium: 10% sodium
  • hydroxide+5% sodium hypochlorite
  • Shell Diameter: ø 800
  • Working Pressure: 1.5mpa
  • Working Temperature: 40º C-90º C
  • Heat Exchange Surface Area: 100M2
  • Material: Gr1\Gr2

Fin tubes

Fin tubes are used in applications involving the transfer of heat from a hot fluid to a colder fluid through a tube wall. Furthermore, finned tubes are used when the heat transfer coefficient on the outside of the tubes is appreciably lower than that on the inside.

U-bend fin tube

Why is U-bend used in pipeline?

As the pipes warm up they expand, the bend allows this expansion to proceed without buckling the pipes. Alternatively, flexible or sliding types of expansion provision are available, and large pipes are mounted on rollers.

Packing for U bend Tubes

We packs all U Tube bundles in bespoke wooden boxes and separate all U Tubes of different radii using finger pallets to facilitate easy assembly of bundles on receipt.

U bend tube packing
U bend tube packing
U bend tube packing
U bend tube packing
U bend tube packing
U bend tube packing

Any type of packing is available according to customer need to worldwide destinations.

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

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