L-Type Finned Tube
The trapezoidal shape of the cross-section produced during the rolling of the L-type finned tube corresponds to the pattern of the heat flux density distribution. The fin and the tube are bonded so closely that high thermal efficiency is achieved, and the contact thermal resistance due to the gaps between fins in conventional finned tubes is practically eliminated.
Operating Temperature:≤ 230°C
Features:Produced by a wrapping process, so production efficiency is high,Regular fin spacing, Outstanding heat transfer performance and high finning ratio, The base tube is thoroughly protected from atmospheric corrosion
One reason that the L-type finned tube remains the most affordable finned tube option is that it usually uses CNC fin winding machines for production, which results in a quite simple process that, in turn, leads to a high rate of material utilization.
The main differences between L-type finned tubes and high-efficiency types (like G-type or KL-type) include:
Heat Restrictions: As the fins are mounted by tension winding, when metal expands at high temperatures or thermal cycling, the fins can get loose. Therefore, the maximum temperature during operation is usually set at approximately 150 °C (there is a mention of 175 °C in some sources, but generally, it is lower than other types). Going above this temperature results in a significant loss of bond strength.
Weak Resistance to Vibration: The fins can get loose or detached in the case of very harsh vibration conditions or frequent thermal cycling. This will increase the contact thermal resistance and hence, the heat transfer efficiency will be reduced.
Fin Stiffness: The L-type fins are less stiff and have a moderate level of mechanical strength when compared to integrally finned or welded fin tubes.
Applications:They are primarily used in air coolers and air heaters of different industries such as petrochemical, power generation, papermaking, tobacco, and building heating, as well as air heaters in spray drying systems for vegetable protein powder, starch, and other food products in the food industry.
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.
