Twisted tubes, also known as spiral oval tubes, were first introduced by Swedish company and later improved by American company as an enhanced heat transfer tube. Their structural feature is that the cross-section remains elliptical throughout the entire heat transfer length. In heat exchangers, they can be used either in mixed tube bundles (a combination of twisted tubes and plain tubes) or as fully twisted tube bundles.
The manufacturing process of twisted tubes includes two main stages: "flattening" and "twisting." The tube cross-section is elliptical, and the ratio of the major to minor axis is designed based on the flow velocities on both the tube side and shell side. When the tube-side flow rate is low, the axis ratio can be increased to reduce the flow area and thereby raise the velocity. The unique geometry enables both tube-side and shell-side fluids to flow in a helical pattern, significantly enhancing turbulence.
The overall heat transfer coefficient of twisted tube heat exchangers is about 40% higher than that of conventional heat exchangers, while the pressure drop remains nearly the same. In recent years, this type of heat exchanger has been further refined and developed, offering greater reliability and efficiency compared to other types. Almost all systems that require shell-and-tube heat exchangers can adopt twisted tube heat exchangers.
FAQ：
1. Are you manufacturer or trader?
We are titanium tube manufacturer producing from melting titanium sponge, extruding hollow billet, rolling to finished tubes and destructive test mechanical test, chemical analysis, non-destructive tests like Ultrasonic test, Eddy current test, Pneumatic test and hydrostatic test are available in house.
Beside titanium tube production line, we also have finning lines. Our factory is still expanding and will invest more on finning facilities.
2. How many workers are there in your factory?
Till 2026, we have 210 staffs.
3. How fast can you deliver the materials?
It depends on the size and quantity, the standard time is 45 days.
4. What is the payment term you can offer?
Standard term is 30% T/T in advance, balance before shipment. L/C is also acceptable. It can be discussed based on different project.
5. Can you provide third party inspection service?
Yes, we can arrange BV/TUV/SGS/LR etc inspection. EN10204 3.2 certificate can be provided.
6. What is your annum turnover?
For 2025, we have had 100 million US dollars turnover for our whole group including factory and the export company.
7. What is the percentage of your export and domestic market share?
Approximately 30% of orders are for export and 70% are for domestic market. However we are aiming to increase more investment on export and hopefully the percentage can be 50-50 in the near future.
8. What country are your clients from?
We are working with overseas clients from Europe like Netherland, France, Italy, Spain etc, USA, Korea, Japan, Indonesia, Vietnam, Singapore, Chile, Argentina, Brasil, Russia, Belarus, Uzbekstan. Basically we work with clients from all over the world. We welcome every client to approach us for inquiry, and we will be ready to serve our clients. We also welcome our clients to visit our factory for onsite audit.
