Bimetallic Tubes
Alma Tech Srl developed and patented an innovative method for manufacturing bimetallic tubes for heat exchanger assuring an excellent quality level with a competitive price.
Bimetal tubes are a type of tubing made up of two different metals that are bonded together. These tubes are often used in applications where resistance to corrosion is important. The two metals are chosen for their specific properties, with one metal being selected for its corrosion resistance and the other for its strength.
In bimetallic tubes with corrosion resistance, the corrosion-resistant metal is typically on the inside of the tube, where it will be in contact with the fluid or gas being transported. This helps to prevent the material from corroding and weakening over time. Meanwhile, the outer layer of the tube is made from a strong metal that can withstand the pressure and stresses of the application. Anyway it is also possible to manufacture bimetallic tubes with reverse conditions (corrosion-resistant alloy on outside of the tube) and mechanical-resistance alloy on inside).
Bimetallic Tubes with Ferrules and longer Inner Tube
Standard Dimensions - Bimetallic Tubes
| Outside Diameter | Outside Thickness | Inner Thickness | Length | Ferrule Length | |||||
|---|---|---|---|---|---|---|---|---|---|
|
(mm) |
(inch) |
(mm) |
(BWG) |
(mm) |
(BWG) |
(m) |
(ft) |
(mm) |
(inch) |
|
6.00 ÷ 114.30 |
0.27”÷4.5” |
0.711 ÷ 7.21 |
22 ÷ 2 |
0.51 ÷ 3.05 |
25 ÷ 11 |
0.3 ÷ 20 |
1 ÷ 66 |
0 ÷ 500 |
0 ÷ 20 |
Bimetallic tubes offer an excellent technical and economical solution for the production of high-performance heat exchangers with high stress and corrosive conditions.
| Outside Diameter | |
|---|---|
|
(mm) |
(inch) |
|
6.00 ÷ 114.30 |
0.27”÷4.5” |
| Outside Thickness | |
|---|---|
|
(mm) |
(BWG) |
|
0.711 ÷ 7.21 |
22 ÷ 2 |
| Inner Thickness | |
|---|---|
|
(mm) |
(BWG) |
|
0.51 ÷ 3.05 |
25 ÷ 11 |
| Length | |
|---|---|
|
(m) |
(ft) |
|
0.3 ÷ 20 |
1 ÷ 66 |
| Ferrule Length | |
|---|---|
|
(mm) |
(inch) |
|
0 ÷ 500 |
0 ÷ 20 |
Materials - Bimetallic Tubes
| Outer Tube |
|---|
|
SA 179 / A 179 - Carbon Steel SA 214 / A 214 - Carbon Steel SA 213 / A 213 - Stainless Steel SA 312 / A 312 - Stainless Steel SA249 / A249 – Stainless Steel SB 111 / B 111 - Copper & Cu Alloys SB 523 / B523 - Zirconium & Zr Alloys SB 338 / B338 - Titanium & Ti Alloys |
| Inner Tube |
|---|
|
SA 179 / A 179 - Carbon Steel SA 214 / A 214 - Carbon Steel SA 213 / A 213 - Stainless Steel SA 312 / A 312 - Stainless Steel SA249 / A249 – Stainless Steel SB 111 / B 111 - Copper & Cu Alloys SB 523 / B523 - Zirconium & Zr Alloys SB 338 / B338 - Titanium & Ti Alloys |
| Ferrules |
|---|
|
SA 179 / A 179 - Carbon Steel SA 214 / A 214 - Carbon Steel SA 213 / A 213 - Stainless Steel SA 312 / A 312 - Stainless Steel SA249 / A249 – Stainless Steel SB 111 / B 111 - Copper & Cu Alloys SB 523 / B523 - Zirconium & Zr Alloys SB 338 / B338 - Titanium & Ti Alloys |
| Outer Tube | Inner Tube | Ferrules |
|---|---|---|
|
SA 179 / A 179 - Carbon Steel SA 214 / A 214 - Carbon Steel SA 213 / A 213 - Stainless Steel SA 312 / A 312 - Stainless Steel SA249 / A249 – Stainless Steel SB 111 / B 111 - Copper & Cu Alloys SB 523 / B523 - Zirconium & Zr Alloys SB 338 / B338 - Titanium & Ti Alloys |
SA 179 / A 179 - Carbon Steel SA 214 / A 214 - Carbon Steel SA 213 / A 213 - Stainless Steel SA 312 / A 312 - Stainless Steel SA249 / A249 – Stainless Steel SB 111 / B 111 - Copper & Cu Alloys SB 523 / B523 - Zirconium & Zr Alloys SB 338 / B338 - Titanium & Ti Alloys |
SA 179 / A 179 - Carbon Steel SA 214 / A 214 - Carbon Steel SA 213 / A 213 - Stainless Steel SA 312 / A 312 - Stainless Steel SA249 / A249 – Stainless Steel SB 111 / B 111 - Copper & Cu Alloys SB 523 / B523 - Zirconium & Zr Alloys SB 338 / B338 - Titanium & Ti Alloys |
In case of different material combinations, do not hesitate to contact our technical department.
Types of bimetallic tube
Bimetallic tube is composed of two different materials: usually inner material is a corrosion resistant alloy (copper, copper alloys, aluminium-brass, titanium, stainless steel, carbon steel) whereas the outer material is a high-stress resistant alloy (stainless steel, carbon steel, titanium, copper, copper alloys). It is, however, possible to manufacture bimetallic tubes with any material combination.
Bimetallic Tubes with ferrules
| Without Ferrules | With Ferrules |
|---|---|
|
|
|
In applications with high pressures and corrosive conditions, bimetallic tube permits a large economical savings in comparison with a tube made of a single alloy, since the use of precious materials is reduced to the minimum.
Inspection and Tests – Bimetallic Tubes
- Chemical Composition
- Mechanical Properties
- Hydrostatic Test
- Pneumatic Test
- Pulling Test
- Boroscopic Inspection
- Eddy Current Test
Also available Bimetallic Tubes
Tube-in-tube Safety Tubes (Leakage Detector Tubes)
Applications:
- Applications with critical cross-contaminations.
- Drinking Water (heat pumps, heat exchangers, …).
- Food Process Industry.
- Electrical Transformers (cooling devices).
- Chemical/Petrochemical Processes (heat recovery systems).
- Preventing catastrophic failure of motors or generators (water should leak into cooling air).
How it works:
Heat exchanger, with leakage detector system, consists of 2 bonded concentric tubes, each expanded to a separated tube sheet. Any defect or damage on inner or outer tube will be detected instantaneously (double protection for contamination from tube side or shell side!). Smallest defects are detected thanks to grooves between inner and outer tube. The “leakage gap” is manufactured on outer surface of inner tube and it should be designed on measure for customer (if required). Contact surface between inner and outer tube (for heat transfer) is reached through the top surface of pyramid-shape channel (ask for a specific drawing for more information).Applications – Bimetallic Tubes
The common application fields are:
- heat exchangers for power plants (electric, nuclear, thermal and geothermal power plants);
- high corrosive systems (condensers, evaporators, sea water desalinations, fertilizing, urea systems, ammonia, gas, corrosive acids);
- chemical and petrochemical industries;
- food processing and refrigeration industries.
Research and Development
Research and Development (R&D) activities are crucial for an innovative company to stay competitive, create new products or services, improve existing ones, and drive growth. These activities involve systematic investigation and experimentation, aimed at discovering and applying new knowledge and technologies. Please visit our R&D page for more details.
For any kind of information and request do not hesitate to contact our Team, Alma Tech Srl is at Your complete disposal.