Polyurethane direct buried insulation pipe, also known as "hollow pipe", is composed of high-density polyethylene outer protective layer, polyurethane rigid foam pipe and steel pipe. The rigid polyurethane foam insulation layer with a density of 60kg/m3 to 80kg/m3/m3 is used to fully fill the gap between the steel pipe and the casing, and has a certain bonding strength, so that a solid whole is formed between the steel pipe, the outer casing and the insulation layer. .

In addition, the PU insulation pipes are equipped with leakage lines, which are safe and reliable. When there is a leak somewhere in the pipeline, after conduction through the pipeline, the tester will display the water seepage of the thermal insulation pipeline. The direction and degree of leakage of the water leakage are large, so as to inform the seepage personnel how to quickly deal with the leaking water pipe and ensure the heating pipe network. Safe operation.

The structure of the steel jacketed steel hot water air conditioning insulation pipe can be divided into two categories according to the different sliding modes: inner sliding type: the insulation structure is made of working steel pipe, aluminum silicate, drag reduction layer, microporous calcium silicate, and heat insulation layer. .Stainless steel fastening strip. Aluminum foil reflective layer. Polyurethane insulation layer.

The structure of the prefabricated direct-buried insulation pipe for heating: 1. Outer protection pipe: protect the insulation layer from being eroded by groundwater, support the working pipe, bear a certain external load, and ensure the normal operation of the working pipe. 2. Anti-corrosion layer: protect the outer pipe, prevent the corrosion of the steel pipe, prevent the corrosion of the steel pipe, and prolong the life of the steel pipe. Drag reduction layer: ensure the free movement of the working steel pipe due to thermal expansion and contraction. PU foam layer: ensure the temperature of the medium and the surface of the outer protective tube at normal temperature. 5. Barrier. Reflective layer: ensure that the organic foam material does not enter the inorganic hard high temperature resistant layer, and reflects part of the heat.