Residential heating polyurethane insulation pipe

As a type of insulation material, rigid polyurethane foam insulation pipe has low thermal conductivity, good insulation performance, and excellent insulation performance. The on-site joint insulation of prefabricated polyurethane foam insulation pipes must pass the pressure resistance test and undergo on-site joint insulation construction. This project is suitable for the construction of polyurethane foam insulation pipelines. The construction quality directly affects the service life of the pipeline. There are two methods for insulation layer: on-site foaming construction and insulation brick construction. No matter what method is used, defects such as annular space, cracks, and delamination will not occur. There are many methods to maintain this layer (such as high-density polyethylene and glass fiber reinforced plastic protective layer), but it is important to ensure the integrity and sealing of the joints.

Due to the use of rigid polyurethane foam insulation layer, the polyurethane insulation pipe is close to the steel pipe skin, isolated from the penetration of air and water, and can play a very good anti-corrosion role. Meanwhile, the cells are closed and have a very low water absorption rate. The high-density polyethylene shell and glass fiber reinforced plastic shell have good anti-corrosion, insulation, and mechanical properties. Therefore, the outer surface of the working steel pipe is not easily corroded by external air and water. The reason for low water absorption is that the closed porosity of polyurethane foam is about 92%. The insulation layer with low thermal conductivity, low water absorption, and good external performance, as well as the high-density polyethylene or glass fiber reinforced plastic protective shell, have changed the traditional heating pipe with a "wet cotton pad" and greatly reduced the total heat loss. The heat loss of the heating network is 2%, and the standard requirement is less than 10%.

Equipment and pipelines should undergo strength tests or air tightness tests according to regulations. Can insulation and cold insulation only be carried out after passing testing?

In special circumstances, the pipeline can be insulated and cooled before the strength test or air tightness test, but all welds must be retained. Reserve insulation prefabricated groups or 250mm distance on both sides of the weld seam, and treat the end face. The reserved part of the insulation layer should be constructed after the pipeline strength and airtightness tests are qualified.

Polyurethane foam insulation pipe is a directly buried prefabricated insulation pipe with good insulation performance, safety and reliability, and low engineering cost. Effectively solved the insulation, sliding lubrication, waterproofing and other problems of exposed pipe ends of prefabricated insulation fittings with a temperature of -600 ℃ in 130 cities for centralized heating. Polyurethane foam insulation pipe not only has professional technology and practical performance, but also has significant social and economic benefits, and is a powerful measure for heating energy conservation. The use of directly buried heating pipe technology for prefabricated insulation pipe fittings marks a new starting point in the development of heating pipe technology in China.

This utility model consists of a steel pipe, a glass fiber reinforced plastic inner sleeve, and a glass fiber reinforced plastic outer shell. Its characteristics are high temperature resistant insulation layer, lubricating layer, and elastic sealing element. The prefabricated insulation pipe fittings of this utility model effectively solve the problem of centralized heating in cities between 130 ℃ and 600 ℃. Polyurethane foam insulation pipe is used for high-temperature heat transfer insulation, sliding lubrication, and waterproofing of exposed pipe ends.

Damage to the insulation layer of polyurethane foam insulation pipes can affect their insulation performance and requires timely and effective repair and improvement. Many people encounter this situation not only when it comes to how to start. Today, let me explain to you the repair method for damaged insulation layer of polyurethane foam insulation pipe? First remove the damaged part, then purchase the hard foam two-component polyurethane castable, take an appropriate amount of it and mix it, and pour it evenly on the damaged mouth. If the damaged mouth is facing downwards, select the cardboard box to form a cavity. The curing time of polyurethane is about 15 seconds.

Solvent bonding method: Apply an appropriate plastic solvent evenly to the bonding surface for a few seconds until viscosity appears on the two face-to-face platforms. In order to achieve the desired tightening effect, appropriate pressure should be applied until it solidifies. According to the properties of the bonding surface, brushes, auxiliary knives, or spray guns can be selected.

The laying of heating pipelines is divided into two methods: above ground and underground. The method of laying on the ground is a traditional and relatively economical approach. Due to its lack of contact with groundwater and soil, it is easy to operate and manage, and easy to locate and troubleshoot. However, for large-scale centralized heating systems, the heat loss from above ground installation is relatively high, especially with a significant impact on the urban environment. The laying of centralized heating pipelines underground is a common method, such as placing heating pipelines in trenches.

Due to the fact that the method of laying in the trench can ensure that the pipeline is not exposed, it can avoid the influence of rain, snow, and other factors on the pipeline. In order to solve the problem of free expansion and contraction of the pipeline under different temperatures, specialized pipeline connection devices can be installed in the trench, which is called trench laying. Compared to above ground installation, trench laying eliminates the need for above ground supports and other structures, solving the problem of occupying land. However, its cost is higher than that of above ground installation. At present, the direct burial laying technology of heating pipelines has developed rapidly, and many countries around the world commonly use this method.

Polyurethane insulation pipes can be buried deep underground and will not rot. We all know that many pipes gradually rot after being buried deep underground. This phenomenon will cause certain economic losses to people. Therefore, more and more people and construction teams are looking for insulation pipes with strong anti-corrosion properties. It is precisely because of such a huge market demand that a new industrial chain has emerged. Therefore, polyurethane insulation pipes that meet everyone's requirements have emerged. This pipe has strong corrosion resistance and will not rot even when buried deep underground during use.

Prefabricated thermal buried insulation pipes can be used to transport chemicals such as petroleum. Although there are countless pipelines in the building materials market now, there are not many that can transport petroleum and maintain stable physical and chemical properties. Although many pipelines are relatively inexpensive in the market, their scope of use is very narrow. Among many pipelines, this type of insulation pipe has become a versatile tool, which can help transport petroleum and can also be applied in many fields such as production and life. Therefore, this type of pipeline has entered chemical plants to engage in the transportation of petroleum.

Prefabricated polyurethane foam insulation pipes have good performance, safety, and quality, and the insulation effect is also quite good. They can withstand high and low temperatures under different conditions. Therefore, this material will soon be better developed and updated with relevant technical support. The technology for this material is mainly reflected in terms of its practicality.

The anti-corrosion level of steel casing for buried insulation pipelines should be determined according to the local soil corrosiveness level. When the corrosiveness level of the soil for buried insulation pipes is high, the anti-corrosion level should be considered as extra strong level. When the corrosiveness level of the soil is medium, the anti-corrosion level should be considered as strong level. When the corrosiveness level of the soil is low, the anti-corrosion level should be considered as ordinary level. So when designing, it is necessary to clarify the corrosion level of the soil in the pipeline laying section in order to optimize the anti-corrosion level.

The sound insulation performance of polyurethane insulation pipes is very good, which avoids the noise of liquid flowing through the pipeline during transportation and saves a lot of money. Due to the increased axial stress of the pipeline, it is sometimes necessary to strengthen the tee or increase the burial depth. Preheating installation method: Preheat the pipeline to the intermediate temperature before backfilling, weld the pipeline, and then backfill to achieve pre stressing installation, reducing the pre stressing in operation by half. Preheating can be selected according to the actual situation, such as electric preheating, steam or hot water preheating, etc. Compensator installation method: Preheat the pipeline to the intermediate temperature after backfilling. Fiberglass insulated pipes have advantages such as low heat loss, low transmission resistance, low scaling, easy installation, and strong prefabrication ability. They can be divided into three layers: inner lining layer, insulation layer, and leak proof layer. They are mainly composed of resin, fiberglass winding, and polyurethane materials, and are widely used in multiple fields, effectively solving the problem of urban centralized heating.