heat Water pipe Thermal insulation material
Prefabricated direct burial Thermal insulation pipe Work by Steel pipe , hard polyurethane Foam insulation layer, high-density polyethylene protective layer (or glass fiber reinforced plastic protective layer) classification
The classification methods of polyurethane insulation pipes are very complicated. Generally, according to people's habits, there are several ways
1. According to the temperature of its transmission medium, it can be divided into: normal temperature polyurethane directly buried insulation pipe, high temperature polyurethane directly buried insulation pipe, and cryogenic polyurethane directly buried insulation pipe; 2. According to the difference of the outer protective layer, it can be divided into: FRP outer protective layer polyurethane directly buried insulation pipe, high-density polyethylene outer protective layer polyurethane directly buried insulation pipe, steel outer protective layer polyurethane directly buried insulation pipe and other outer protective layer directly buried insulation pipe; 3. There are many kinds of different transmission media: such as polyurethane prefabricated insulation pipe for water supply, high-temperature resistant polyurethane insulation pipe, directly buried polyurethane composite prefabricated insulation pipe for steam transmission, and buried rigid polyurethane foam plastic anti-corrosion insulation pipe for oil, etc. There are many other names, such as polyurethane buried pipe, polyurethane prefabricated pipe, polyurethane directly buried prefabricated pipe, polyurethane jacket pipe, polyurethane foam insulation pipe, etc.
Polyurethane insulation pipe is used for insulation and cold insulation of various indoor and outdoor pipelines, central heating pipelines, * * * air-conditioning pipelines, chemical, pharmaceutical and other industrial pipelines. The polyurethane foam insulation pipe has been developed rapidly as an excellent thermal insulation material since the polyurethane synthetic material was born in the 1930s, and its application scope is also more and more extensive. It is widely used in various heat supply, refrigeration, oil transmission, steam transmission and other pipelines due to its simple construction, remarkable energy-saving and anti-corrosion effects. It is widely used in various heating, cooling, oil and steam pipelines.
Steel pipe:
General according to the design and customer requirements For: DN200 following Select seamless pipe （GB8163-87） ， DN200 Selected above Spiral welded pipe（ GB9711-88;SY/T5038-92） And longitudinal welded pipe （GB3092-93） 。 After the surface of steel pipe is treated by advanced shot blasting, the rust removal grade of steel pipe can reach GB8923-1988 In the standard Sa2 Grade, surface roughness can reach GB6060.5-88 In the standard R=12.5 micron
Insulation layer:
The product is applied to the steel pipe by on-site pouring or prefabrication, which is simple and effective. The suitable temperature of polyurethane insulation layer is one hundred and twenty ℃— -196 ℃。 The thermal conductivity of polyurethane foam is low in thermal insulation materials, so the heat loss of materials can be reduced to a lower limit.
Polyethylene protective layer ：
High density polyethylene: the product is characterized by high strength, impact resistance, environmental aging resistance, prestressed cracking, corrosion resistance, low temperature resistance, easy welding, simple construction, strict sealing and no leakage.
Product advantages:
one Reduce project cost.
According to the estimation of relevant departments, the double pipe heating pipeline can generally reduce the project cost twenty-five %(FRP is used as the protective layer) and ten %(High density polyethylene is used as the protective layer).
two Low heat loss and energy saving.
Its thermal conductivity is: λ ＝ zero ． 013 — zero ． 03kcal ／ m · h · oC , much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is improved 4~9 Times. Moreover, its water absorption is very low, about zero ． 2kg ／ m2 。 The reason for low water absorption is that the closed cell ratio of polyurethane foam is as high as ninety-two %Left and right. Low thermal conductivity and low water absorption, plus insulation layer and high density polyethylene or glass fiber reinforced plastic protective shell with good waterproof performance outside, have changed the traditional trench laying of heating pipes “ Wear wet cotton padded jacket ” The overall heat loss of the heating pipeline is greatly reduced, and the heat loss of the heating network is two %, less than*** ten %Standard requirements.
three Anti corrosion, good insulation and long service life.
As the polyurethane rigid foam insulation layer is closely bonded to the outer skin of the steel pipe, it can isolate the infiltration of air and water and play a good anti-corrosion role. 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 Langfang Xinda Thermal Insulation Materials Co., Ltd Introduction, service life can reach fifty More than years, longer service life than traditional trench laying and overhead laying 3~4 Times.
four . Pipe insulation. Small land occupation, fast construction, and favorable for environmental protection.
The directly buried heat supply pipeline does not need to build a huge trench for insulation, but only needs to bury the insulation pipe underground, so the project land occupation is greatly reduced, and the amount of earth excavation is reduced by about fifty %Above, reduce the amount of civil masonry and concrete ninety ％。 At the same time, insulation pipe processing and on-site trenching are conducted in parallel, and only on-site joints are needed, which can shorten the construction period by about fifty %Above.
