What are the advantages of G-type finned tubes?

    G-type finned tube It is used to enhance heat exchange efficiency; typically, fins are added to the surface of heat exchange tubes to increase their external (or internal) surface area, thereby improving heat transfer performance. G‑type finned tubes are a new, wear‑resistant heat‑transfer material and an energy‑saving heat‑exchange component. Using a high‑frequency power source as the heat source, both the steel strip and the steel tube are simultaneously heated and welded into a single unit. These tubes feature high heat‑transfer efficiency, a large heat‑dissipation area, long service life, a wide operating temperature range, and high pressure resistance. They are widely employed in industries such as waste‑heat recovery, petrochemicals, power‑plant boilers, economizers, greenhouses, heating, refrigeration, pharmaceutical drying, wood drying, and grain‑drying systems.

　　1. The simple, cost-effective installation reduces the number of connection points, making the installation more economical and faster while lowering the risk of leaks at these joints.

　　2. Maintenance is very simple. After installation, virtually no further maintenance is required.

　　3. High efficiency, G-type finned tube It features full-contact welding between the fins and the steel tube, resulting in a heat dissipation area more than eight times that of a plain tube, with a smoother interior and reduced internal water flow resistance.

　　4. Long service life; high mechanical strength between the fins and the tube, with a tensile strength exceeding 196 MPa; both the inner and outer surfaces of the tube are hot-dip galvanized.

　　Its advantages have led to its widespread use across various fields. G‑type finned tubes are well known. Although they are not commonly seen in everyday life, they play a crucial role in many of our heating appliances and stainless‑steel finned heat exchangers. In many cases, harsh operating conditions can accelerate the wear and tear of stainless‑steel finned tubes, but what are their drawbacks? Let’s find out!

　　1. Dust accumulation and scaling have a significant impact on it.

　　2. If the thermal resistance is high, it will adversely affect heat transfer and service life.

　　Therefore, to avoid the aforementioned issues, we must address them head-on. First and foremost, we should implement proper cleaning and protective measures to extend the service life of these components. However, at present, China’s management practices, technological capabilities, and financial resources are still insufficient to meet or accommodate the stringent requirements of advanced deoxygenation and water‑softening technologies. As a result, the oxygen content in heated water often exceeds permissible limits, leading to corrosion of G‑type finned tubes. Consequently, finding effective solutions to the corrosion problem of G‑type finned tubes under oxygen‑containing conditions is of great significance in China.

　 Based on the current situation, approaches to addressing corrosion can be considered from the following aspects:

　 (1) The design of the heating system should minimize contact between the system and atmospheric oxygen, striving for a fully sealed configuration—e.g., proper placement of vent valves and reliable sealing of circulation pumps. Additionally, during operation, the system should be kept at low pressure to prevent unnecessary water loss.

　　(2) Deoxygenation of make-up water.

　　(3) Add a corrosion inhibitor to the heating water.

　　(4) After stopping heating, perform water‑filling maintenance on the finned tubes using either dry air or deoxygenated water.

　　(5) Newly installed G-type finned tube During pressure testing, the hydrostatic test medium shall contain a solvent and a non-toxic rust inhibitor.