Thermal insulation pipe Introduction:
heat preservation Steel pipe It refers to the steel used to ensure that the internal temperature and surface temperature of the working steel pipe meet or meet the use requirements under the effect of different working environments and external media after heat preservation processing The Conduit 。
Classification: 1. Steel clad steel composite insulated steel pipe is one of the directly buried underground pipelines. It can also be directly buried without concrete structure, that is, the thermal expansion of the working steel pipe is carried out in the outer pipe, which reduces the material cost, shortens the construction date, and ensures the safety of the heating pipeline, which can be more widely used safely in different temperature environments, It is especially suitable for high temperature steam pipeline projects. The operating temperature can reach 150 ℃ - 450 ℃. The product uses steel pipe as the external protective layer, which has the advantages of high strength, not easy to damage, simple construction and maintenance, and long service life. 2. In order to reduce the heat dissipation from the pipeline to the soil on the medium and * * * heat transmission goods or heating pipelines, a thermal insulation composite layer is added outside the pipeline. The commonly used thermal insulation material is hard polyurethane Foam plastic The applicable temperature is - 185~120 ℃. This material is soft. In order to improve its strength, a layer of high-density polymer is applied outside the thermal insulation layer ethylene Layer to form a composite structure to prevent groundwater from infiltrating into the insulation layer. The high-pressure polyurethane foaming equipment is used to carry out shot blasting and rust removal on the outer surface of the steel pipe and corona treatment on the inner surface of the outer protective pipe, so as to improve the bonding performance of the insulation pipe. The insulation layer is made of rigid polyurethane foam with a density of 60kg/m3 to 80kg/m3, which can fully fill the gap between the steel pipe and the casing, and has a certain bonding strength, so that the steel pipe, the outer casing and the insulation layer form a solid whole. Polyurethane foam has good mechanical properties and thermal insulation properties. Generally, it can withstand 120 ℃, and can withstand 180 ℃ through modification or combination with other thermal insulation materials. Advantages and characteristics of polyurethane insulated steel pipes: 1. reduce project cost; 2. reduce heat loss and save energy; 3. have good corrosion resistance, insulation performance and long service life.
