Prefabricated direct burial Thermal insulation pipe One is made up of Steel pipe High density polymer ethylene Outer sleeve and filled between steel pipe and outer sleeve polyurethane The hard foam insulation layer is closely combined. Simply put the steel pipe after rust removal and anti-corrosion in the polyethylene casing, and inject polyurethane foam in the middle to fully fill the gap between the steel pipe and the polyethylene casing, so that the steel pipe, casing and insulation layer will eventually form a solid whole to achieve the effect of anti-corrosion and insulation; This anti-corrosion and thermal insulation method can be overhead or buried underground, and the whole construction process can be carried out on site.
Product structure
Prefabricated directly buried insulation pipe is composed of external protective layer, insulation layer and working steel pipe. The outer protective layer is made of high-density polyethylene plastic, and the thermal insulation layer is rigid polyurethane Foam plastic 。 Prefabricated directly buried insulation pipe is also called "pipe in pipe", and the "two-step method" is made of high-density polyethylene as the outer protective layer. It has high mechanical strength and is not damaged by external factors during transportation, installation and use.
Technical features of polyurethane directly buried insulation pipe products:
Good thermal insulation performance, less heat loss, 25% of the traditional pipe, long-term use can save a lot of energy. Convenient construction, low comprehensive cost, excellent corrosion resistance, impact resistance, long service life, up to 30-50 years, and relatively high installation cost
Low structure characteristics:
(1) Corrosion resistance: chemically inert material, good corrosion resistance, and different corrosion resistant pipes can be selected according to the transmission medium.
(2) High mechanical strength: water pressure resistance, external pressure resistance and impact resistance are good, and pipes and fittings can be designed and manufactured according to the required pressure.
(3) Strong temperature adaptability: operating temperature range: more than - 70 ℃ but less than 250 ℃, and the pipeline will not crack under frozen medium.
(4) Small fluid resistance: the inner wall of the pipe is smooth, with a roughness coefficient of 0.0084. Under the same flow rate, the pipe diameter can be reduced.
(5) Light weight, long service life: light weight, convenient transportation, low construction cost, no maintenance, service life of more than 50 years.
(6) Keep water quality: harmless, and deliver drinking water to maintain long-term water quality and sanitation.
Characteristics of insulation pipe
High temperature prefabricated directly buried insulation pipe - advantages
1. It has strong corrosion resistance and waterproof ability, and its comprehensive cost is low
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. Heat loss is only 25% of that of traditional pipes
Thermal conductivity of directly buried insulation pipe 0.022kcal/m.h. ℃ water repellency 0.03kg/cm ³
3 Long service life
4 Less land occupation and faster construction are conducive to environmental protection. Correct installation and use can make the service life of the pipe network reach 30-50 years, and the maintenance cost is low. Can reduce earthwork excavation by more than 50% and reduce civil masonry and concrete by 90%
Overview of prefabricated directly buried insulation pipe
High temperature prefabricated directly buried insulation pipes are widely used in liquid and gas transmission pipe networks, chemical pipe insulation projects, petroleum, chemical, central heating and heating networks, midpoint air conditioning and ventilation pipes, municipal projects, etc. High temperature prefabricated directly buried thermal insulation pipe is a kind of directly buried prefabricated thermal insulation pipe with good thermal insulation performance, safety and reliability, and low project cost. It effectively solves the problems of heat preservation, sliding lubrication and waterproof of exposed pipe ends of prefabricated directly buried insulation pipes for 130 ℃ - 600 ℃ high temperature heat transmission in urban central heating. The high-temperature prefabricated 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 high-temperature prefabricated directly buried insulation pipe adopts the directly buried heating pipe technology, which marks that the development of China's heating pipe technology has entered a new starting point.?
Composition of prefabricated directly buried insulation pipe
High temperature prefabricated directly buried insulation pipe is composed of steel pipe, glass fiber reinforced plastic inner sheath and glass fiber reinforced plastic shell, which is characterized by: it also includes high temperature resistant thermal insulation layer, lubrication layer and elastic seals. The utility model effectively solves the problems of heat preservation, sliding lubrication and waterproof of exposed pipe ends of prefabricated directly buried heat preservation pipes for 130 ℃ - 600 ℃ high temperature heat transmission in urban central heating.?
The high-temperature prefabricated 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) Thermal insulation layer: rigid polyurethane foam.
(3) Protective shell: high-density polyethylene or glass fiber reinforced plastic.
(4) Leakage startup emergency signal line: When manufacturing high-temperature prefabricated directly buried insulation pipes, the insulation layer close to the steel pipe is embedded with startup emergency signal line. Once leakage occurs somewhere in the pipeline, the emergency signal can be started on the special use detection instrument through the conduction of the alarm line, and the exact location of the leakage and the size of the leakage degree can be displayed, In order to notify the maintenance personnel to deal with the leaking pipe section quickly and ensure the safe operation of the heat supply network.
Advantages of directly buried laying of prefabricated insulation pipes
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 high-temperature prefabricated 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 all 10%.
3. Anti corrosion, good insulation and long service life.
The high-temperature prefabricated directly buried insulation pipe can play a good anti-corrosion role because the polyurethane rigid foam insulation layer is closely bonded to the steel pipe skin, which can isolate 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 high-temperature prefabricated 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.
Safety of prefabricated directly buried insulation pipe
All high-temperature prefabricated directly buried insulation pipes produced outside China are equipped with leakage startup emergency signal line. Once leakage occurs in a pipeline, the transmission of the emergency signal line can be started to display the exact location and degree of water leakage of the insulation pipe on the special detection instrument, so as to notify the leakage detection personnel to quickly deal with the leaking pipe section, Ensure the safe operation of the heating pipe network. At present, there is no leakage start emergency signal line for insulation pipes produced in China, which needs to be filled in.
In a word, high-temperature prefabricated directly buried insulation pipes not only have advanced technology and practical performance that traditional trench and overhead laying pipes cannot match, but also have 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.
Remarks on performance index test method
Density ≥ 940kg/m ³ GB 1033
Tensile strength ≥ 20MPa GB 8804.2
Elongation at break ≥ 600% GB 8802.4
Environmental stress cracking resistance F50 200h GB 1842
Longitudinal retraction rate ≤ 3% GB 6671.2
Performance requirements of polyurethane rigid foam
Remarks on performance index test method
Density ≥ 60kg/m ³ according to GB/T6343
Compressive strength ≥ 0.3MPa according to GB/T8813
Thermal conductivity ≤ 0.033W/(m • K) according to GB/T10297
Heat resistance 120 º C See note
Water absorption ≤ 10%, soak in GB8810 normal pressure boiling water for 90min
Quality: harmless. It can deliver drinking water and maintain long-term water quality and sanitation.
Polyurethane insulation pipeline sales network: municipality directly under the Central Government: Beijing Chongqing Shanghai Tianjin
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