Supply prefabricated buried insulation pipes with plastic sleeves and steel foam insulation pipe manufacturers

Description :

　　Prefabricated buried insulation pipe structure:

　　Inner layer: working steel pipe layer

　　According to the design and customer requirements, seamless pipes (GB8163-87), spiral welded pipes (GB9711-88; SY/T5038-92), and straight seam welded pipes (GB3092-93) are generally selected. After advanced shot blasting and rust removal process, the rust removal grade of the steel pipe can reach Sa2 level in GB8923-1988 standard, and the surface roughness can reach R=12.5 microns in GB6060.5-88 standard.

　　Middle layer: polyurethane insulation layer

　　It is made by injecting the original liquid of rigid polyurethane foam into the cavity formed between the steel pipe and the outer protective layer with a high-pressure foaming machine. It is commonly known as the "pipe in pipe foaming process". Its functions include waterproofing, insulation, and supporting the self weight of the heating network. When the temperature of the conveying medium is -50120, rigid polyurethane foam is selected as the insulation layer.

　　Outer layer: high-density polyethylene protective layer

　　Prefabricated black (yellow) plastic pipes with a certain wall thickness are used to protect the polyurethane insulation layer from mechanical damage and to prevent corrosion and waterproofing.

　　Application of prefabricated buried insulation pipe:

　　Prefabricated buried insulation pipes are widely used in liquid and gas transportation pipelines, chemical pipeline insulation engineering, petroleum, chemical, centralized heating pipelines, air conditioning and ventilation pipelines, municipal engineering, etc. Prefabricated buried insulation pipe is a type of prefabricated insulation pipe with good insulation performance, safety and reliability, and low engineering cost. Effectively solved the insulation, sliding lubrication, and waterproofing problems of prefabricated buried insulation pipes for 130-600 high temperature heat transfer in centralized heating.

　　Advantages and characteristics of prefabricated buried insulation pipes:

　　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).

　　Low heat loss and energy conservation.

　　The thermal conductivity of prefabricated buried insulation pipes is λ=0.0130.03kcal, which is much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is improved by 49 times. Moreover, its water absorption rate is very low, about 0.2kg/m2. The reason of low water absorption is that the closed cell ratio 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 on the outside, have changed the traditional situation of "wet cotton jacket" for laying heating pipelines in underground trenches, reducing the overall heat loss of heating pipelines and reducing the heat loss of the heating network to 2.

　　3. Anti corrosion, good insulation performance, and long service life.

　　As the polyurethane rigid foam insulation layer is closely bonded to the outer skin of the steel pipe, the prefabricated directly buried insulation pipe can isolate the infiltration of air and water and play a good anti-corrosion role. At the same time, its foam pores are all closed, and its water absorption is very low. The high-density polyethylene shell and fiberglass shell both have good anti-corrosion, insulation, and mechanical properties. Therefore, the outer skin of the working steel pipe is difficult to be eroded by external air and water. As long as the water quality inside the pipeline is treated well, the service life of prefabricated buried insulation pipes can reach more than 50 years, which is 34 times longer than traditional trench laying and overhead laying.

　　4. Less land occupation, faster construction, and favorable environmental protection.

　　Directly buried heating pipelines do not require the construction of large trenches, only the insulation pipes need to be buried underground, thus reducing project land occupation, reducing excavation volume by about 50%, and reducing civil engineering masonry and concrete volume by 90%. At the same time, the processing of insulation pipes and on-site trenching are carried out in parallel, and only on-site joints are required, which can shorten the construction period by about 50% or more.

AfterSalesService :

• Prefabricated buried insulation pipe