Xuzhou polyurethane insulation pipe

Xuzhou polyurethane insulation pipe is 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. However, high-density polyethylene has poorer weather resistance and lower heat resistance than fiberglass. High density polyethylene has a heat resistance of 60-70 ℃, while fiberglass has a heat resistance of 100-120 ℃

Xuzhou polyurethane insulation pipe

Our company has three production lines for thermal composite three-layer PE anti-corrosion pipes (capable of hot-melt epoxy powder on the inner wall and three-layer PE and FBE anti-corrosion on the outer wall of steel pipes with diameters ranging from 32mm to 1820mm, equipped with online spark detection, thickness detection, online coding, etc.).

Implementation standard for high-density polyethylene prefabricated buried insulation pipe products

1. European EN253

2. Ministry of Construction issues CJ/T114-2000

3. China National Petroleum Corporation issues standard SY/T0415-1996

4. Standard for signing agreements with clients

External sliding steam buried insulation pipe

The design concept of this product is to use the outer steel pipe as the trench. The external sliding sliding surface is located on the inner surface of the outer protective tube, and the insulation material moves together with the working steel pipe. This structural form is mainly used in soft insulation materials, and its advantage is to ensure that the heat flow does not leak out, effectively solving the problem of increased friction caused by radial expansion. Due to the support ring inside, it will not cause the insulation material to be eccentric or crushed. In today's world, steam insulation pipes often adopt this structure, which can effectively solve problems such as waterproofing, anti-corrosion, water transmission, and exhaust. Keep the pipeline system in a fully enclosed state for reliable operation and long service life. It is generally used to transport steam with a temperature between 150 ℃ and 350 ℃ and a pressure less than 1.6 Mpa.

Internal sliding steam buried composite insulation pipe

The internal sliding type steam directly buried composite insulation pipe is composed of steel pipe conveying medium+composite silicate or microporous calcium silicate - rigid polyurethane foam plastic+outer steel pipe+anti-corrosion protective layer of glass fiber reinforced plastic shell. The insulation treatment technology for various pipe fittings nodes is mature and reliable in quality. The main technical indicators of each layer are shown in Tables 1, 2, 3, and 4. There are three structural products available for customers to choose from: "steel sleeve steel", "polyethylene shell sleeve steel", and "fiberglass shell sleeve steel"!

Product specifications and dimensions

Use steel pipes with a diameter of 22-1200mm, medium temperature of 150 ℃ -350 ℃, and buried at a depth of 1-2m underground.

Product scope of application

The internal sliding steam buried composite insulation pipe is suitable for high-temperature steam pipelines used in urban heating, as well as high-temperature thermal pipelines in industrial sectors such as petroleum, chemical, and power.

　　

Prefabricated fiberglass direct buried insulation pipe

*Layer: The working steel pipe layer generally uses seamless pipes (GB8163-87), spiral welded pipes (GB9711-88; SY/T5038-92), and straight seam welded pipes (GB3092-93) according to the design and customer requirements. After the shot blasting and rust removal process on the surface of the steel pipe, 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. After removing dirt and rust from the surface of the steel pipe, a layer of cyanide coagulation anti-corrosion material is applied, which has the functions of waterproofing and improving the bonding surface between the insulation layer and the steel pipe, forming a whole. The second layer: polyurethane insulation layer, which is made by injecting the original liquid of rigid polyurethane foam into the cavity formed between the steel pipe and the special steel mold with a high-pressure foaming machine. It is commonly known as the "mold foaming process". If the polyurethane foam is full, any quality problem is convenient for direct inspection. Its functions include waterproofing, insulation, and supporting the self weight of the heating network. When the temperature of the conveying medium is -50 ℃ -120 ℃, rigid polyurethane foam is selected as the insulation layer; When the temperature of the conveying medium is -50 ℃ -150 ℃, rigid polyurethane foam is selected as the insulation layer.

Application of fiberglass shell prefabricated buried insulation pipe products

When the temperature of the conveying medium is within the range of -50 ℃ to 150 ℃, insulation and cooling engineering for various media is widely used in urban collective heating, geothermal development, coal mining, petroleum, ports, chemical and other industries. Due to its good weather resistance compared to high-density polyethylene, fiberglass shell is particularly suitable for pipeline networks that alternate between direct burial and overhead laying, as well as heating networks laid in coastal areas.

Execution standard for fiberglass prefabricated buried pipe products

China National Petroleum Corporation issues standard SY/T0415-1996

Ministry of Construction issues standard CJ/T129-2000

Heat shrink tape:

1、 Product Introduction:

Radiation cross-linked polyethylene heat shrinkable tape is a strip-shaped anti-corrosion material composed of radiation cross-linked polyethylene sheet and special hot melt adhesive. Compared with ordinary polyethylene, it has higher mechanical strength, longer service life, corrosion resistance, aging resistance, and environmental pressure cracking resistance. Composite hot melt adhesive has strong adhesion and good sealing properties. Mainly used for joint repair, damage repair, interface, and elbow winding anti-corrosion of steel pipelines in petroleum, natural gas, petrochemical, power, metallurgy, water supply, and other engineering projects.

Radiation cross-linked polyethylene heat shrinkable tape is a strip material composed of a radiation cross-linked polyethylene substrate and hot melt adhesive composite. The substrate is a cross-linked polyethylene material irradiated by high-energy particles. Compared with ordinary polyethylene, it has higher mechanical strength, heat aging resistance, chemical medium corrosion resistance, environmental stress cracking resistance, UV radiation resistance, and a longer service life. Hot melt adhesive has high bonding strength and good resistance to high and low temperatures. This product is mainly used for anti-corrosion joint coating of gas pipeline, oil and gas transmission pipeline, water supply and drainage pipeline and heat supply pipe network. It has many advantages, such as high shear strength, peel strength ≥ 70N/cm, strong aging resistance, good sealing performance, convenient construction, etc. Its quality index meets the petroleum industry standard of SY/T4054-2003 Radiation Crosslinked Polyethylene Heat Shrinkable Tape (Set). With the continuous improvement of pipeline construction technology, the three-layer structure joint filling technology has become very mature.

2、 Product Features

1. Characteristics of heat shrinkable tape

(1) Wide bonding range: can be used with steel PE、 Epoxy coating and other materials are used for bonding.

(2) Strong corrosion resistance: It can effectively penetrate and corrode various media, and has the properties of aging resistance, environmental stress cracking resistance, and UV radiation resistance.

(3) High mechanical strength: high compressive, impact, and shear strength.

(4) Wide range of usage environment: Construction can be carried out within the temperature range of -25 to 35 ℃.

(5) Non volatile, safe to use.

(6) Long service life.

(7) Easy to construct and highly operable.

Hot melt sleeve

Electric heating sleeve: It is a special pipe fitting made by secondary processing and composite special electric heating network on high-quality PE sheet, mainly used for interface connection of anti-corrosion and insulation pipelines.

Purpose: Used for connecting thermal pipeline interfaces. Compared to traditional heat capacity sleeves, it has high adhesive strength, good sealing performance, corrosion resistance, long service life, and is easy to use. The machine design is compact in structure, small in size, light in weight, and easy to move, which improves work efficiency. Equipped with temperature controlled cooling fan, fast heat dissipation, and extended service life. Temperature and current automatic control, modular and integrated process parameters have improved welding quality and construction efficiency.

Jiangsu Xuzhou Polyurethane Insulation Pipe Manufacturer

Classification of polyurethane insulation pipes:

1. According 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;

2. According 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;

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 direct buried prefabricated pipe, polyurethane jacket pipe, polyurethane foam insulation pipe, and so on.

Application of polyurethane insulation pipe:

Polyurethane insulation pipes are used for insulation and cooling engineering of various indoor and outdoor pipelines, central heating pipelines, central air conditioning pipelines, chemical, pharmaceutical and other industrial pipelines. Overview: Polyurethane foam insulation pipe has been rapidly developed as an excellent insulation material since the birth of polyurethane synthetic materials in the 1930s. Its application scope is also becoming more and more extensive. Due to its simple construction, energy saving and anti-corrosion, it is 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.

Selection of steel pipes:

According to the design and customer requirements, seamless pipes (GB8163-87) are generally used for pipes below DN200, while spiral welded pipes (GB9711-88; SY/T5038-92) and straight seam welded pipes (GB3092-93) are used for pipes above DN200. After the shot blasting and rust removal process on the surface of the steel pipe, 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.

Shandong Dacheng Anticorrosion and Thermal Insulation Installation Engineering Co., Ltd. specializes in the production, sales and processing of thermal insulation pipes. The polyurethane jacket thermal insulation pipe, also known as "pipe in pipe", is composed of a "two-step method", which is composed of high-density polyethylene outer protective layer, polyurethane rigid foam plastic pipe and steel 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 casing and the insulation layer form a solid whole. The black and yellow jacket insulation pipe foam has good mechanical properties and thermal insulation properties. Generally, it can withstand 120 ℃. By modification or combination with other insulation materials, it can withstand 180 ℃.

Polyurethane jacket insulation pipe has become a relatively mature technology in some developed countries abroad. In the past decade, China's heating engineering technicians have been digesting and absorbing this technology, and Shandong Dacheng is promoting the development of domestic pipeline laying technology to a higher level. The practical achievements over the past decade have fully proved that the laying method of black and yellow jacket insulation pipes has many advantages compared to traditional trench and overhead laying. The directly buried thermal insulation pipe is composed of steel pipe conveying medium, high-density polyethylene outer sleeve, and rigid polyurethane foam insulation layer between the steel pipe and the outer sleeve.

Polyurethane foam prefabricated directly buried insulation pipe

Single tube system

The single pipe system of Shandong Dacheng Anti corrosion and Insulation Installation Engineering Co., Ltd. is an integrated polyurethane prefabricated insulation pipeline system, suitable for underground laying and transporting high-temperature hot water with a long-term operating temperature of 140 ℃. Our company has over 10 years of experience in the production and installation of single tube systems. Based on the three in one structure of pipelines, uncompensated installation can be achieved in the design and construction of pipeline networks.

Technical advantages:

Low heat loss; The installation method is convenient and fast; Low comprehensive investment; High safety and stability; A service life of over 30 years.

Dual tube system

The dual pipe system of Shandong Dacheng Anti corrosion and Insulation Installation Engineering Co., Ltd. is an integrated polyurethane insulation prefabricated insulation pipeline. Through design calculations, the water supply pipe and return pipe are installed in the same high-density polyethylene jacket pipe. The dual pipe system is applied for low-temperature 90 ℃ hot water transportation from the heat exchange station to the buried secondary pipeline network of end users. The dual pipe system is also suitable for uncompensated installation of buried pipelines.

Technical advantages:

Save investment in pipeline network construction; Save space for pipeline laying; Reduce heat loss in the pipeline network; Improve the efficiency of pipeline installation.

Polyurethane insulation pipe for trench

Trench type polyurethane foam prefabricated insulation pipeline

In order to meet the special needs of pipeline trench laying, Shandong Dacheng has developed polyurethane insulated pipelines and accessories for underground pipeline trench laying, which can be used to transport high-temperature hot water with a long-term operating temperature of 140 ℃.

Technical advantages:

Easy to install on site; Good insulation and waterproof effect; Low heat loss; Low maintenance workload; A service life of over 30 years.

Polyurethane insulation pipe for overhead use

Prefabricated insulated polyurethane foam pipes for overhead use

In centralized heating pipelines, it is sometimes necessary to install pipelines in the air, such as laying them along mountain slopes or crossing rivers. In these special cases, overhead pipeline laying has obvious advantages over buried or trench laying. In response to this special application requirement, Langfang Jinxing Chemical Co., Ltd. has designed an overhead insulation pipeline with galvanized iron sheet as the outer protective layer, which has good UV resistance and excellent waterproof performance. This product has been successfully applied in overhead pipeline networks.

Technical advantages:

Easy installation; Good insulation performance; Good waterproof performance; Resistant to ultraviolet radiation.

High temperature pipeline system

Shandong Dacheng Anti corrosion and Insulation Installation Engineering Co., Ltd. has a steel outer protective tube vacuum composite insulation prefabricated buried pipeline system, which uses high-temperature resistant glass wool as the insulation layer of the pipeline to transport high-temperature steam or hot water with a temperature below 350 ℃. In addition to providing high-quality insulation pipeline products, Shandong Dacheng Anti corrosion and Insulation Installation Engineering Co., Ltd. can also provide users with * support and services. Through the professional finite element stress analysis software CAESAR II, our company's engineers can accurately calculate the stress of pipelines, ensuring the safety and long-term service life of pipeline operation.

Technical advantages:

Improved the insulation effect of the pipeline;

Due to the application of vacuum, the radiation and convective heat transfer of pipelines have been greatly reduced to the greatest extent possible;

Reduced the corrosion damage rate of pipelines;

Keep the inner and outer steel pipes dry;

Has a leak warning effect on the pipeline network;

Reduced the accident rate of the pipeline network.

The directly buried prefabricated insulation pipe, referred to as "pipe in pipe" or "jacket pipe", is a composite pipe that uses the excellent adhesion of polyurethane foam to skillfully combine the polyethylene shell or glass fiber reinforced plastic shell with rigid polyurethane foam plastic and steel pipe into an integral structure when foaming. Due to its better insulation performance, waterproofing, anti-corrosion, long service life, and easy construction compared to other structures, this pipe is currently the most advanced insulation material both domestically and internationally.

　　

Steel sleeve steel buried insulation pipe/high-temperature steam insulation pipe/steel sleeve steel steam composite insulation pipe is suitable for transporting steam or other media below 2.5MPa and 350 degrees Celsius. This product uses steel pipes as the outer protective layer, which has the advantages of high strength, low damage, easy construction and maintenance, and long service life. The steel casing (steel sleeve steel) burial technology is a new burial technology that is waterproof, leak proof, anti-seepage, pressure resistant, and fully enclosed. It is a major breakthrough in the use of direct burial laying technology in areas with high groundwater levels. It is composed of steel pipes for conveying medium, anti-corrosion outer steel pipes, and ultra-fine glass wool filled between steel pipes and outer steel pipes. It can also be compounded by graphite, calcium silicate tile shell and polyurethane foam filled.

High density polyethylene prefabricated buried insulation pipe with a three-layer structure from inside to outside

*Layer: The working steel pipe layer generally uses seamless pipes (GB8163-87), spiral welded pipes (GB9711-88; SY/T5038-92), and straight seam welded pipes (GB3092-93) according to the design and customer requirements. After the shot blasting and rust removal process on the surface of the steel pipe, 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.

The second layer: polyurethane insulation layer, which 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 -50 ℃ -120 ℃, rigid polyurethane foam is selected as the insulation layer.

Third layer: High density polyethylene protective layer, prefabricated into black (yellow) plastic pipes with a certain wall thickness, which are used for backup after being treated with corona technology. Its functions are twofold: firstly, to protect the polyurethane insulation layer from mechanical damage caused by hard objects; secondly, to prevent corrosion and waterproofing.

High density polyethylene prefabricated 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. However, high-density polyethylene has poorer weather resistance and lower heat resistance than fiberglass. High density polyethylene has a heat resistance of 60-70 ℃, while fiberglass has a heat resistance of 100-120 ℃. Therefore, it should be taken seriously in application!

Explanation

A. Polyethylene pipes are prone to aging, and if stored outdoors, they should be covered with tarpaulins or other materials. The stacking area should be away from high heat and fire sources. After making insulation pipes, it is forbidden to expose them to direct sunlight or sudden cooling, otherwise polyethylene pipes are prone to cracking, affecting product performance and service life.

B. During transportation and threading, rough loading and unloading should be avoided, and hooks should be too thin, too hard, or applied too much force, otherwise it is easy to cause polyethylene pipes to be broken, scratched, or torn.

C. The wall thickness of the pipe can be adjusted, and the wall thickness and color can be produced according to user requirements. Due to the different wall thicknesses of the pipe, the thickness of the insulation layer is approximate and should be calculated based on the actual thickness.

D. The brackets, plastic plugs, flange plates at both ends, welding rods, welding guns, heat shrink tapes, etc. that are compatible with the pipes are complete.

E. The allowable deviation in the table is based on the CJ/114-2000 industry standard.

The calculation formula is: when the outer diameter is ≤ 400mm, the sum of upper and lower deviations=0.1 × nominal wall thickness+0.2

When the outer diameter is ≥ 400mm, the sum of the upper and lower deviations is 0.15 times the nominal wall thickness plus 0.2

　　

Application of Directly Buried Insulation Pipe:

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 in industries such as urban centralized heating, warm rooms, cold storage, coal mines, oil pipeline ports, chemical industry, natural gas pipelines, power direct burial, central air conditioning pipeline insulation, cable conduit, steam insulation pipelines, etc.

Advantages and characteristics of polyurethane buried insulation pipe

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. Its thermal conductivity is λ=0.013-0.03kcal/m • h • oC, which is much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is improved by 4-9 times. Moreover, its water absorption rate is very low, about 0.2kg/m2. The reason for low water absorption is that the closed cell rate 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, have changed the traditional situation of "wet cotton jacket" for laying heating pipes in underground trenches, greatly reducing the overall heat loss of heating pipes. The heat loss of the heating network is 2%, which is less than the standard requirement of 10%.

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, it 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, according to foreign data, the service life can reach more than 50 years, which is 3-4 times longer than the service life of 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 greatly reducing project land occupation, reducing excavation volume by more than 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 more than 50%.

5. Safety: The polyurethane buried insulation pipe is equipped with a leakage alarm line. Once a leakage occurs in a certain part of the pipe, the accurate location and degree of leakage of the insulation pipe can be displayed on the detection instrument through the transmission of the alarm line, so as to notify the leakage personnel to quickly deal with the leaking pipe section and ensure the safe operation of the heating pipe network.