Directly buried thermal insulation pipe, thermal pipe insulation pipe

Directly buried thermal insulation pipes, thermal pipeline insulation pipes
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Polyurethane insulation material is currently the best insulation material in the world. Rigid polyurethane has excellent properties such as light weight, low thermal conductivity, good heat resistance, aging resistance, easy to bond with other base materials, and does not produce droplets when burned. Polyurethane insulation boards are widely used in many countries for roofs, walls, ceilings, floors, doors, and windows of buildings. Thermal insulation material. Prefabricated polyurethane insulation pipes are used in thermal insulation and anti-corrosion work in petrochemical, urban heating network, town construction and other projects.

Polyurethane direct-buried insulation pipe, also known as pipe-in-pipe, is composed of a two-step method. It is composed of high-density polyethylene outer protective layer, polyurethane rigid foam plastic pipe and steel pipe. The insulation layer material is made of rigid polyurethane foam, which fully fills the gap between the steel pipe and the casing and has a certain bonding strength, so that the outer casing of the steel pipe and the insulation layer form a solid whole. Polyurethane direct-buried insulation pipe foam has good mechanical properties and thermal insulation properties. It can usually withstand temperatures of ℃ through modification or combination with other insulation materials.

Polyurethane insulated directly buried pipes have become a relatively mature and advanced technology in some developed countries abroad. In the past decade or so, our country's heating engineering technicians have digested and absorbed this advanced technology and are promoting the development of domestic pipeline network construction technology to a higher level. The practical results of more than ten years have fully proved that the construction method of polyurethane insulated directly buried pipes has many advantages compared with traditional trench and overhead construction. Directly buried insulated pipes are closely combined with a steel pipe for transporting media, a high-density polyethylene outer casing, and a rigid polyurethane foam insulation layer between the steel pipe and the outer casing


< br/>Specializing in the production of polyurethane insulation pipes, direct buried insulation pipes, prefabricated insulation pipes, environmentally friendly pipe insulation pipes, cold and hot water insulation pipes, energy-saving thermal insulation pipes, steel sleeve steel insulation pipes, composite insulation pipes, rock wool insulation pipes and tiles, aluminum silicate insulation pipes and tiles, etc. Ten types of insulation materials. High quality, low price, timely supply and excellent service team serving our customers around the clock. Welcome to call the hotline for consultation.

The structure of the prefabricated directly buried thermal insulation pipe can be divided into three layers from the inside to the outside:

The first layer is the working core tube for transporting the medium
General material of the core tube It is seamless pipe (B), spiral welded pipe (B/), straight seam welded pipe (B), galvanized steel pipe, R and other materials, which can be selected according to different requirements of users. The core pipe diameter is [ ]
Second layer The insulation layer material is polyurethane foam or composite insulation material, [the thickness of the insulation layer is]
The third layer is the outer protective layer, which is a high-density polyethylene jacket tube, fiberglass winding pipe and anti-corrosion steel pipe.

Insulation pipe specifications and dimensions
Nominal diameter working steel pipe
Outer diameter, wall thickness, outer protection pipe
Outer diameter, wall thickness, insulation layer thickness, supply length
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Insulation pipes with other specifications or technical requirements can be manufactured according to user requirements
Unsaturated resin ( Technical properties of FRP protective layer
Project technical indicators
Specific gravity
Bending strength (/*)
Tensile strength (/*)
Tensile elastic modulus ( /*)
Compressive strength (/*)

Technical performance of high-density low-pressure polyethylene protective layer
Testing method for project unit performance standard test results
Tensile strength ＞: B
Elongation at break % ＞ B
Vicat softening point ℃ ＞ B
Breakdown strength ＞ B
Embrittlement temperature ℃ ＜ ＜
Environment resistance Temperature＞Hours no crack B
Environmental stress resistance % pass B
Chemical corrosion resistance % pass B
% pass B



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