Is there a difference in material and structure between directly buried insulation pipe and overhead insulation pipe?

the material of directly buried temperature pipes is the same as that of overhead pipes. Like the thermal insulation materials of steam pipes, superfine glass wool is generally used, and the thermal insulation materials of hot water pipes are generally used for overhead. Now, polyurethane (PU) is used for direct burial. Generally, the shell of overhead pipe is made of aluminum foil, glass fiber reinforced plastic or galvanized iron sheet, and it is also made of color-coated board. The steam pipe in the directly buried pipe is made of steel jacket pipe, generally made of q235b, and the directly buried hot water pipe is made of high-density polyethylene sheathed pipe (namely HDPE).

thermal insulation pipe is the abbreviation of thermal insulation pipe. Thermal insulation pipe is used for the transportation of liquid, gas and other media, and it is used in thermal insulation engineering of pipelines in petroleum, chemical industry, aerospace, military, central heating, central air conditioning and municipal administration.

the high-temperature prefabricated directly buried insulation pipe is mainly composed of four parts.

(1) working steel pipe: according to the technical requirements of conveying medium, slotted steel pipe, seamless steel pipe and double-sided submerged arc spiral welded steel pipe are adopted respectively.

(2) insulation layer: rigid polyurethane foam is used.

(3) protective shell: high-density polyethylene or glass fiber reinforced plastic is used.

(4) Leakage alarm line: When manufacturing high-temperature prefabricated directly buried insulation pipe, an alarm line is buried in the insulation layer close to the steel pipe. Once leakage occurs in a certain part of the pipe, through the conduction of the alarm line, an alarm can be given on the special detector table and the exact location and degree of leakage can be displayed, so as to inform the maintenance personnel to deal with the leaking pipe section quickly and ensure the safe operation of the heating network.