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Product
Polyurethane insulated steel pipe
- Product details
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Polyurethane insulated steel pipes, also known as insulation buried pipes, are divided into outer polyethylene and inner polyurethane insulated pipes, steel sleeve steel insulated pipes, outer iron sheet and inner polyurethane insulated pipes. They are made of outer and inner polyurethane to provide insulation for the transportation of liquids through steel pipes.
Construction characteristics
1. Reduce project costs
According to relevant departments' calculations, double pipe heating pipelines can generally reduce project costs by about 25% (using fiberglass as a protective layer) and 10% (using high-density polyethylene as a protective layer).
2. Low heat loss, saving energy
The thermal conductivity of high-temperature prefabricated buried insulation pipes is λ=0.013-0.03kkcal m · h · oC, which is much lower than other commonly used pipeline insulation materials in the past and has a better insulation effect. Moreover, its water absorption rate is very low, about 0.2kgm2. The reason for low water absorption is that the closed cell rate of polyurethane foam is up to 92%. Low thermal conductivity and low water absorption, combined with insulation layer and high-density polyethylene or fiberglass protective shell with good waterproof performance, have changed the traditional situation of "wet cotton jacket" for laying heating pipelines in underground trenches, greatly reducing the overall heat loss of heating pipelines. The heat loss of the heating network is 2%, which is less than the international standard requirement of 10%.
3. Anti corrosion, good insulation performance, long service life
High temperature prefabricated directly buried insulation pipes have a good anti-corrosion effect due to the tight bonding of the polyurethane insulation layer to the outer skin of the steel pipe, which isolates the infiltration of air and water. At the same time, its foam pores are all closed, and its water absorption is very low. Both high-density polyethylene shell and fiberglass shell have good anti-corrosion performance. Therefore, the outer skin of the working steel pipe is difficult to be eroded by external air and water.
4. Less land occupation, faster construction, favorable for environmental protection
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common problem
Q
What are the main types of building insulation materials? What are the advantages and disadvantages of each?
A
Advantages: Good fire resistance (Class A non combustible), good breathability, and high stability.
Disadvantages: Slightly higher thermal conductivity than organic materials, higher water absorption rate, and easy generation of fiber dust during construction.
Organic insulation materials (such as EPS polystyrene board, XPS extruded board, PU polyurethane):
Advantages: low thermal conductivity, good insulation effect, light weight, and convenient construction.
Disadvantages: The fire rating is mostly B level (requiring the addition of flame retardants), it is prone to deformation at high temperatures, and its durability is slightly poor.
Composite insulation materials (such as integrated insulation board, vacuum insulation board):
Advantages: Excellent comprehensive performance, high construction efficiency, and some can achieve Class A fire protection.
Disadvantages: High cost and strict requirements for the flatness of the base layer.
Q
How to choose insulation materials suitable for the project?
A
Fire prevention requirements: Grade A materials are required for high-rise buildings (>100m); Low level B1 (flame retardant) is available.
Climate conditions: In extremely cold regions, materials with low thermal conductivity (such as PU, XPS) are preferred; Low water absorption is required in humid environment (such as XPS, foam glass).
Base type: Concrete walls often use boards; Complex shapes can be coated with polyurethane or insulated mortar.
Economy: EPS has the lowest cost; Vacuum insulation board is expensive but thin.
Policy and regulations: B2 level materials are prohibited in some areas, and local standards need to be consulted.
