来源:http://www.sdhpgy.com 日期:2018-11-27 发布人:admin
Construction Characteristics of Polyurethane Thermal Insulation Pipe
1. reduce project cost
According to the calculation of relevant departments, the cost of double-pipe heating pipeline can generally be reduced by 25% (using FRP as protective layer) and 10% (using high-density polyethylene as protective layer).
2. Low Heat Loss and Energy Conservation
The thermal conductivity of high temperature prefabricated directly buried insulating pipe is as follows: lambda = 0.013-0.03kcalm h oC, which is much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is increased by 4-9 times. And its water absorption is very low, about 0.2 kgm2. The reason of low water absorption is that the obturator rate of polyurethane foam is as high as 92%. Low thermal conductivity and low water absorption, together with high density polyethylene or fiberglass reinforced plastic protective shell with good insulation layer and external waterproof function, have changed the situation of traditional trench laying heating pipeline "wearing wet cotton jacket", greatly reduced the overall heat loss of heating pipeline, heat loss of heating network is 2%, less than the international standard requirement of 10%.
3. Anti-corrosion, good insulation function, long service life
High-temperature prefabricated direct-buried insulating pipe has good anti-corrosion effect because the insulating layer of polyurethane insulating pipe is tightly bonded to the outer skin of steel pipe, which isolates the infiltration of air and water. Together, its foam holes are closed and its water absorption is very small. High density polyethylene shell and FRP shell have good anti-corrosion, insulation and mechanical functions. Therefore, it is very difficult for the outer skin of the working steel pipe to be corroded by the outside air and water. As long as the internal water quality of the pipeline is well treated, according to foreign information, the service life of the high temperature prefabricated directly buried insulation pipe can reach more than 50 years, which is 3-4 times longer than that of the traditional trench laying and overhead laying.
4. It occupies less land, constructs quickly, and is beneficial to environmental protection.
Directly buried heating pipelines do not need to build huge trenches. They only need to bury heat preservation pipelines underground, which greatly reduces the construction area, reduces the amount of earthwork excavation by more than 50%, and reduces the amount of civil masonry and concrete by 90%. Together, heat preservation pipe processing and digging ditches are carried out in parallel with each other. Only field joints can shorten the construction period by more than 50%. Prefabricated directly buried heat preservation pipes are widely used in liquid and gas transportation network, chemical pipeline heat preservation engineering petroleum, chemical industry, central heating and heating network, central air conditioning and ventilation pipeline, municipal engineering, etc. Direct buried insulation pipe is a kind of prefabricated insulation pipe with good thermal insulation function, safety and reliability, and low cost. The problems of heat preservation, smooth sliding and waterproofing of bare pipe ends of prefabricated directly buried insulating pipes for heat transfer at 130-600 (?) C in Township Central heating are solved. Direct buried insulation pipe not only has advanced technology and useful functions that are difficult to compare with traditional trench and overhead pipeline laying, but also has significant social and economic benefits, and is also a powerful way to save energy for heating. The prefabricated direct buried insulation pipe adopts the technology of direct buried heating pipe, which indicates that the development of polyurethane insulation pipe technology for heating in China has entered a new starting point.
Polyurethane insulation pipe shell: used for indoor and outdoor pipelines, central air-conditioning pipelines, chemical industry, medicine and other industrial pipelines to keep warm and cold.
Highly functional polyether polyols and polymethylene polyphenyl polyisocyanate were selected as the main raw materials, and foamed by chemical reaction under the action of catalyst, foaming agent and surfactant.
In summary, all the above-mentioned Shandong Hipper Pipe Technology Development Co., Ltd. provides, want to know more about the black jacket straight-seam steel pipe, welcome to pay attention to our website: http://www.sdhpgy.com Thank you for your support!

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