Working pipe: anti-corrosion pipe. Insulation layer: polyurethane. Outer protective pipe: polyethlene
Product application: Heat supply, cooling supply, anti-corrosive in the field of crude oil transportation, thermal insulation pipeline engineering.
The above two insulation structure are applied at home. It’s more reliable to adopt external than internal sliding in design theory,because the force analysis is simple, the internal air layer settings easily, row of wet is better. Abroad basically adopts the external sliding structure.