Supply details of buried polyurethane insulation pipes

Supply details of buried polyurethane insulation pipes

Since the birth of polyurethane synthetic materials in the 1930s, polyurethane hot water insulation pipes have been developed as an excellent insulation material, and their application scope has become increasingly wide. Due to their simple construction, energy saving and anti-corrosion properties, they are widely used in various pipelines such as heating, cooling, oil transportation, and steam transportation. Widely used in various pipelines for heating, cooling, oil transportation, steam transportation, etc.

External sliding air layer insulation structure form

1Inner steel pipe

2Zinc rich primer

3Sliding guide bracket

4High temperature resistant glass wool

5Aluminum foil reflective layer

6Air insulation layer

7Coat steel pipe

8Outer steel pipe anti-corrosion coating

Supply details of buried polyurethane insulation pipes　

Prefabricated insulation pipes for directly buried high-temperature steam are a type of underground pipeline that can be directly buried without concrete structures. The thermal expansion of the working steel pipe is carried out inside the outer pipe, thereby reducing material costs, shortening construction dates, and ensuring the safety of heating pipelines. They can be widely used safely in different temperature environments, especially for high-temperature steam pipeline projects. The operating temperature can reach 150 ℃ -450 ℃. The inner steel pipe is coated with a second degree inorganic zinc rich primer (temperature resistance ≥ 400 ℃) anti-corrosion coating, and the pipe ends are sealed with polyethylene film or three-layer PE cold wrapping tape to prevent moisture from entering before installation or water from entering during construction. The insulation material is wrapped with multiple layers of staggered seams, effectively reducing heat loss, while controlling the surface measures of the outer jacket to prevent the formation of cold bridges, thus ensuring the temperature control of the anti-corrosion layer of the outer jacket. Wrapping multiple layers of aluminum foil reflective layer with insulation material effectively reduces heat loss and makes the steam pipeline more economical and reasonable. The anti-corrosion coating and cathodic protection are combined to protect the outer steel pipe, which greatly increases the anti-corrosion service life. The drainage system adopts a fully enclosed form, with flexible layout, reasonable structure, and safety and reliability. The moisture discharge pipe on the steel casing can not only timely discharge humid gases, but also serve as an alarm signal pipe for daily operation. The thermal compensation of the pipeline adopts high-quality corrugated pipe compensators, which are installed inside the casing and made in a direct burial form, without the need for observation wells. The construction operation is convenient and the construction period is short.

Insulated pipelines are widely used in the transportation network of liquids and gases, chemical pipeline insulation engineering, petroleum, chemical, central air conditioning ventilation pipelines, municipal engineering, etc. High temperature prefabricated direct buried insulation pipe is a type of direct buried 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 high temperature heat transfer from 130 ℃ to 600 ℃ in urban centralized heating. High temperature prefabricated buried insulation pipes not only have the technical and practical performance of traditional trench and overhead pipeline laying, but also have significant social and economic benefits, and are also powerful measures for heating energy conservation. The adoption of direct buried heating pipeline technology for high-temperature prefabricated insulation pipes marks a new starting point in the development of China's heating pipeline technology.

Insulation pipe is composed of steel pipe, fiberglass inner sheath, and fiberglass outer shell. Its characteristics include: high temperature resistant insulation layer, lubrication layer, and elastic sealing element. This utility model effectively solves the insulation, sliding lubrication, and waterproofing problems of prefabricated buried insulation pipes for high temperature heat transmission in urban centralized heating from 130 ℃ to 600 ℃.

Partial composition

​(1)Working steel pipes: According to the technical requirements of the conveying medium, seamless steel pipes, double-sided submerged arc spiral welded steel pipes are used.

(2)Thermal insulation layer: rigid polyurethane foam plastic or aerogel felt.

(3)Protective shell: Made of high-density polyethylene or fiberglass.

(4)Leakage alarm line: When manufacturing high-temperature prefabricated buried insulation pipes, an alarm line is buried in the insulation layer near the steel pipe. Once a leakage occurs in a certain part of the pipeline, the transmission of the alarm line can trigger an alarm on the detection instrument and display the accurate location and degree of leakage, so as to notify maintenance personnel to quickly deal with the leaking pipe section and ensure safe operation.

Advantages and Features

Polyurethane insulated steel pipes have good insulation performance, with heat loss only 25% of traditional pipes. Long term operation can save a lot of energy and significantly reduce energy costs. Anti corrosion and insulation steel pipes have strong waterproof and corrosion-resistant capabilities, and do not require pipe trenches. They can be directly buried underground or in water, making construction simple and fast. Anti corrosion and thermal insulation steel pipes also have good corrosion resistance and impact resistance under low temperature conditions, and can be directly buried in underground frozen soil. The service life of anti-corrosion and insulation steel pipes can reach 30-50 years, and correct installation and use can reduce the maintenance cost of the pipeline network. Anti corrosion and insulation steel pipes can be equipped with an alarm system to automatically detect pipeline leakage faults, accurately indicate the fault location, and automatically sound an alarm. The product is widely used in various industries such as power, chemical, pharmaceutical, refining, natural gas, shipbuilding, metallurgy, mining, insulation pipelines, heating pipelines, water treatment, etc. Polyurethane foam insulated steel pipes are suitable for insulation and cooling engineering of various media transported within the range of -50 ℃ to 150 ℃. It is widely used in insulation and cooling projects for urban centralized heating, warm rooms, cold storage, coal mines, oil ports, chemical industries, and other industries. As the polyurethane rigid foam insulation layer is closely bonded to the steel pipe skin, the 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. Less land occupation, faster construction, and favorable environmental protection. The polyurethane rigid foam insulation layer is closely bonded to the outer skin of the steel pipe to isolate the infiltration of air and water, which can play a good anti-corrosion role. At the same time, its foam holes are all closed, with low water absorption. The high polyethylene shell and fiberglass shell 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 properly, according to foreign sources. Anti corrosion, good insulation performance, and long service life.

Polyurethane direct buried insulation pipes are suitable for insulation and cooling projects that transport various media within the range of -50 ℃ to 150 ℃. It is widely used in insulation and cooling projects for urban centralized heating, warm rooms, cold storage, coal mines, oil ports, chemical industries, and other industries.

The classification of polyurethane insulation pipes is very complex, and there are generally several ways according to people's habits

1According to the temperature of the conveying medium, it can be divided into: normal temperature polyurethane direct buried insulation pipe, high temperature polyurethane direct buried insulation pipe, and deep cold polyurethane direct buried insulation pipe;

2According to the different outer protective layers, it can be divided into: fiberglass outer protective layer polyurethane direct buried insulation pipe, high-density polyethylene outer protective layer polyurethane direct buried insulation pipe, steel outer protective layer polyurethane direct buried insulation pipe, and other outer protective layer direct buried insulation pipes;

3According to the different transmission media, there are many kinds: such as polyurethane prefabricated insulation pipes for water supply, high temperature resistant polyurethane insulation pipes, directly buried polyurethane composite prefabricated insulation pipes for steam transmission, and buried rigid polyurethane foam plastic anti-corrosion insulation pipes for oil, etc. There are many other names such as polyurethane buried pipe, polyurethane prefabricated pipe, polyurethane direct buried prefabricated pipe, polyurethane jacket pipe, polyurethane foam insulation pipe, and so on.