In the thermal design of G-type embedded finned tubes, ambient and operating temperatures serve as the primary determinants of heat transfer efficiency. The fundamental constraint arises from the coefficient of thermal expansion and the melting point of the fin material. Specifically, when the tube wall temperature exceeds the 150°C–210°C range, aluminum fins undergo significant thermal expansion, leading to a rapid increase in contact thermal resistance. This physical limitation necessitates the exclusion of aluminum-finned tubes from high-temperature flue gas recovery systems, where carbon steel or stainless steel alloys must be utilized to maintain thermal contact and oxidation resistance.

These specialized finned tubes are predominantly integrated into Air-Cooled Heat Exchangers (ACHE) within petrochemical refineries and power generation steam condensers. In these scenarios, high thermal loads are invariably coupled with high internal pressures. The structural reliability of the heat exchanger is a systemic synthesis: while the base tube’s diameter and wall thickness define its theoretical burst pressure, the absolute quality of the fin-to-tube attachment and welding—free from porosity or micro-cracks—is critical to prevent localized stress failure.

To ensure operational stability, manufacturing protocols must prioritize the "material-temperature-pressure" correlation. This involves selecting base tube and fin alloys based on precise peak temperature thresholds and the chemical composition of the medium. Furthermore, the integrity of the embedded joint is secured through calibrated mechanical grooving and back-filling. Finally, the thickness of pressure-retaining components, including tube sheets and headers, is determined through rigorous strength calculations, ensuring long-term mechanical and thermal performance in extreme industrial environments.