The main purpose of the drain joint of the steel sheathed steel insulation pipe is to first understand the structure of the super pipe. The structure of the drain joint is: 1. Inner steel pipe 2. Zinc rich primer 3. Sliding guide bracket 4. High temperature resistant glass wool 5. Aluminum foil reflective layer 6. Air insulation layer 7. Outer steel pipe 8. Outer steel pipe anti-corrosion layer.

Thermal insulation, sliding lubrication and waterproof of exposed pipe end of steel steam composite insulation pipe with steel jacket. The thermal insulation pipe not only has the advanced technology and practical performance that are hard to compare with the traditional trench and overhead pipeline, but also has significant social and economic benefits. It is also a powerful measure for heating and energy saving.

The drain joint device is a relatively weak component in the prefabricated directly buried steam pipeline, so the operation stability of the device should be fully considered in the layout of the pipe network. No matter which method is adopted in the project, the drainage device shall be installed near the fixed pier as far as possible to reduce the displacement of the drainage device and reduce the possibility of damage of the drainage device due to displacement.

In terms of performance, the super pipe fitting method is better than the mechanical processing method. Therefore, the selection of pipe fittings should integrate safety and economy, and it is appropriate to minimize the non-standard of pipe fittings. In addition, factors such as site construction conditions, construction level and procurement cycle of pipe fittings should also be paid attention to in the selection of pipe fittings.