Quotation of directly buried pipe insulation Use of polyurethane insulation pipe products: (for heating insulation pipe, hot spring insulation pipe, heating insulation pipe, heating insulation pipe, air conditioning insulation pipe, steam insulation pipe, cold insulation pipe). The product is composed of steel pipe for conveying medium (as working pipe), polyurethane rigid foam plastic (as insulation layer), high-density polyethylene outer sleeve or wrapped glass fiber reinforced plastic (as protective layer), which are closely combined.
Quotation of directly buried pipe insulation Polyurethane insulation pipe
summary:
Prefabricated polyurethane directly buried insulation pipe mainly consists of four parts.
1. Working steel pipes: according to the technical requirements of the transmission medium, seamed steel pipes, seamless steel pipes and double-sided submerged arc spiral welded steel pipes are used respectively.
2. Insulation layer: rigid polyurethane foam.
3. Protective shell: high-density polyethylene or glass fiber reinforced plastic.
4 Leakage * * * line: When manufacturing prefabricated polyurethane directly buried insulation pipe, * * * line is buried in the insulation layer near the steel pipe. Once leakage occurs in a certain part of the pipe, through the conduction of the alarm line, the accurate position of the leakage and the degree of leakage can be displayed on the * * * detection instrument, so as to notify the maintenance personnel to quickly deal with the leaking pipe section and ensure the safe operation of the heating network.
Quotation of directly buried pipe insulation Performance:
Prefabricated polyurethane directly buried thermal insulation pipe has good mechanical properties and thermal insulation performance. Generally, it can withstand high temperature of 120 ℃. By modification or combination with other thermal insulation materials, it can withstand high temperature of 180 ℃. It is suitable for thermal insulation engineering of various cold and hot water high and low temperature pipelines.
Price of directly buried hot water prefabricated insulation pipe advantage:
1. Reduce project cost.
According to the estimation of relevant departments, the double pipe heating pipeline can generally reduce the project cost by about 25% (using glass fiber reinforced plastic as the protective layer) and 10% (using high-density polyethylene as the protective layer).
2. Low heat loss and energy saving.
The thermal conductivity of the prefabricated polyurethane directly buried insulation pipe is λ=0.013-0.03kcal/m · h · oC, which is much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is improved by 4~9 times. Moreover, its water absorption is very low, about 0.2kg/m2. The reason of low water absorption is that the closed cell rate of polyurethane foam is up to 92%. The low thermal conductivity and low water absorption, together with the insulation layer and the high density polyethylene or glass fiber reinforced plastic protective shell with good waterproof performance outside, have changed the situation of traditional trench laying of heat supply pipes "wearing wet cotton padded jacket", greatly reducing the overall heat loss of heat supply pipes. The heat loss of the heat network is 2%, less than the standard requirement of * * * 10%.
3. Anti corrosion, good insulation and long service life.
Prefabricated polyurethane directly buried insulation pipe can play a good anti-corrosion role because the polyurethane rigid foam insulation layer is closely bonded to the outer skin of the steel pipe, preventing the infiltration of air and water. At the same time, its foam pores are closed, and its water absorption is very small. High density polyethylene shell and glass fiber reinforced plastic shell have good anti-corrosion, insulation and mechanical properties. Therefore, the outer skin of working steel pipe is difficult to be eroded by external air and water. As long as the water quality inside the pipeline is well treated, according to foreign data, the service life of prefabricated polyurethane directly buried insulation pipe can reach more than 50 years, which is 3~4 times longer than that of traditional trench laying and overhead laying.
4. Small land occupation, fast construction, favorable for environmental protection and reducing construction disturbance.
Directly buried heating pipes do not need to build huge trenches, but only need to bury the insulation pipes underground, so the project land occupation is greatly reduced, the amount of earthwork excavation is reduced by more than 50%, and the amount of civil masonry and concrete is reduced by 90%. At the same time, insulation pipe processing and on-site trenching are conducted in parallel, and only on-site joints are needed, which can greatly shorten the construction period. As the transportation of bricks, cement, sand and gravel, and residual soil is reduced, the vehicle exhaust emissions, dust emissions, and noise emissions during the construction process are reduced, thus protecting the environment.
5. Security
At present, the prefabricated polyurethane directly buried insulation pipes produced outside China are all equipped with a leakage * * * line. Once a leakage occurs in a pipeline, the accurate location and degree of leakage of the insulation pipe can be displayed on the * * * detection instrument through the conduction of the * * * line, so as to inform the leakage detection personnel to quickly deal with the leaking pipe section and ensure the safe operation of the heating pipe network. At present, no leakage * * * line has been set for insulation pipes produced in China, which needs to be filled in.
Summary:
In a word, the prefabricated polyurethane directly buried insulation pipe not only has the advanced technology and practical performance unmatched by the traditional trench and overhead laying pipeline, but also has significant social and economic benefits, which is also a powerful measure for heat supply and energy conservation. The use of directly buried heating pipeline technology marks that China's heating pipeline technology has entered a new starting point. With the further improvement and development of this advanced technology, it is imperative to directly bury heating pipelines instead of trench and overhead.
