The outer sleeve of directly buried steam pipeline should ensure that the inner pipe and thermal insulation material operate in a strictly waterproof space. If the outer sleeve is damaged (caused by corrosion, mechanical damage, welding quality, etc.), the groundwater seeps into the insulation layer and evaporates into steam after the inner pipe is heated, which makes the interface temperature of the thermal insulation material and the outer surface temperature of the outer sleeve difficult to c

The outer sleeve of directly buried steam pipeline should ensure that the inner pipe and thermal insulation material operate in a strictly waterproof space. If the outer sleeve is damaged (caused by corrosion, mechanical damage, welding quality, etc.), the groundwater seeps into the insulation layer and evaporates into steam after the inner pipe is heated, which makes the interface temperature of the thermal insulation material and the outer surface temperature of the outer sleeve difficult to c