Polyurethane direct buried insulated steel pipe manufacturer

Cangzhou Tianyuan Anti-corrosion Engineering Co., Ltd.
Polyurethane insulated steel pipe manufacturer Cangzhou Tianyuan Anti-corrosion Engineering Co., Ltd. is a professional polyurethane insulated steel pipe manufacturer. Our company has an advanced polyurethane insulated steel pipe production line. The polyurethane insulated steel pipe produced by our company We conduct quality tracking and control throughout the entire process from raw materials, rust removal, coating to product delivery. Cangzhou Longdu Pipeline Co., Ltd. always adheres to the customer-centered approach, uses scientific management as a means to fully develop and rationally utilize resources, and continuously improves. And we meet customer needs with high-quality products, low prices for polyurethane insulated steel pipes, and perfect designs.
The polyurethane insulation pipe has a three-layer structure from the inside to the outside
The first layer: the working steel pipe layer generally uses seamless pipe (B) spiral welded pipe () and straight seam welded pipe (B) according to the design and customer requirements. ). After the surface of the steel pipe has been treated with advanced shot blasting and rust removal technology, the rust removal grade of the steel pipe can reach the level in the B standard, and the surface roughness can reach the B standard. R=.micron
Second layer: Polyurethane insulation layer with high pressure The foaming machine injects the raw liquid of rigid polyurethane foam into the cavity formed between the steel pipe and the outer sheath at one time. It is commonly known as the tube-in-tube foaming process. Its function is firstly to waterproof, secondly to keep heat, and thirdly to support the weight of the heating network. When the temperature of the conveying medium is: ℃℃, use rigid polyurearate foam as the insulation layer.
The third layer: The high-density polyethylene protective layer is pre-made into a black (yellow) plastic pipe with a certain wall thickness. Its function is to protect the polyurethane insulation layer from damage by mechanical hard objects and to be anti-corrosion and waterproof
Product structure: Prefabricated directly buried steam insulation pipe is composed of core pipe (working steel pipe) rent-reducing layer, insulation layer, reflective layer, fastening steel belt, sliding bracket, air layer, outer protective steel pipe, spray polyurethane, and winding fiberglass .
Precautions for polyurethane insulated pipes
It is necessary to truly understand that the direct burial laying method of heating pipes is divided into two methods: direct burial laying with compensation and direct burial laying without compensation, which are under design and construction. Really understand the working principles, characteristics and application locations of the two methods so that they can be reasonably selected in design and safe, reliable and economical in construction.
. Carry out careful inspection after entering the site, and conduct research on the manufacturers of prefabricated directly buried insulated pipes before construction. Refuse to use unqualified insulation pipes.
.Polyurethane insulation pipe welding is a key task to ensure project quality in the construction of prefabricated directly buried pipelines.
.The construction quality of various well chambers directly affects the quality of the project and the service life of the pipelines, as well as the fixed brackets. If the well chamber is not waterproof, components will be damaged due to water immersion. Therefore, construction should be carried out carefully to ensure construction quality.
. When the pressure conditions are met, attention must be paid to the pressure of prefabricated directly buried thermal insulation pipelines. First, fill the water and drain out the air, and then do it in two steps: Stabilize the pressure without leakage. Strength test: raise the pressure in the pipe to .times of the working pressure and then use a small hammer to tap the welds one by one around the welds to check. Tightness test: when the pressure in the pipe is reduced to the working pressure, there will be no leakage and no leakage in minutes. If the pressure drop does not exceed 1.0 atmospheres, it is considered qualified. Pressure test records should be made in accordance with the requirements of the specification.
.Because the prefabricated directly buried insulated pipes are buried underground, the project was accepted. Most of them are hidden projects. If the completion acceptance is not serious and the completion information is not detailed, it will affect future use.
.Joints and backfill soil should be tested for pressure in the pipeline. Completion measurement can only be carried out after cleaning, and the specified thickness of sand must be backfilled according to the construction characteristics of polyurethane insulation pipes. Do not cut corners
. Sufficient attention must be paid. The on-site joint insulation of prefabricated directly buried insulated pipes must be carried out after passing the pressure test. On-site joint insulation construction can be carried out. This content is unique to the construction of prefabricated directly buried insulated pipes. The construction quality directly affects the service life. The insulation layer has two methods: on-site foam construction and insulation tile construction. No matter which method is used for construction, defects such as annular spaces, cracking, and delamination cannot occur. There are many ways to maintain the layer (such as high-density polyethylene and fiberglass reinforced plastics). protective layer) but must ensure the integrity, tightness and waterproofness of the joint. The rise speed of polyurethane insulation pipes is slow. This phenomenon generally occurs during construction in autumn and winter or in the morning due to a sudden drop in temperature or low temperature. This can be solved by raising the ambient temperature and black material temperature. Generally, the temperature of the black material is raised to ℃, and the ambient temperature is raised to ℃.
Polyurethane insulation pipes are suitable for chemical industry, urban heating network, petroleum, municipal construction and other projects. The applicable insulation range is expanded from ℃℃ of ordinary U to ℃℃. It is mainly used for thermal insulation of heat medium materials in pipes and containers. It has good thermal insulation performance and less heat loss, which is 1% of that of traditional pipes. It can save a lot of energy in long-term use. The structure is composed of three parts: outer protective layer, insulation layer and anti-leakage layer. The outer protective layer material is polyethylene or fiberglass or other materials. There are three types of laying methods: direct burial, overhead, and trench.
Polyurethane direct-buried insulation pipes have good thermal insulation performance, and the heat loss is only % of traditional pipes. Long-term operation can save a lot of energy and significantly reduce energy costs.
. It has strong waterproof and corrosion resistance, no need for attached pipe trenches, and can be directly buried in the ground or water. The construction is simple and fast, and the overall cost is low.
It also has good corrosion resistance and impact resistance under low temperature conditions, and can be directly buried in underground frozen soil.
The service life can be up to 10 years. Correct installation and use can make the maintenance cost of the pipe network extremely low.
. An alarm system can be set up to automatically detect leakage faults in the pipe network, accurately indicate the fault location and automatically alarm.
The service life can be up to 10 years. Pipe diameter: DD Thickness: mm Application: central heating pipes, refrigeration pipes, industrial pipes, etc.
, Oxygen index: Density: /cubic m Hydrophobicity: ./cubic m Thermal conductivity: ./mh℃
Performance characteristics
, Used with low thermal conductivity and good thermal insulation performance As a thermal insulation material, rigid polyurethane has excellent thermal insulation properties.
After normal operation, when water with a temperature of ℃ is transported to kilometers away, the temperature drop is only about ℃.
, has strong waterproof and corrosion resistance, no need for attached pipe trenches, and can be directly buried in the ground or water. The construction is simple and fast, and the overall cost is low.
It also has good corrosion resistance and impact resistance under low temperature conditions, and can be directly buried in the frozen soil layer.
The prefabricated insulation pipe uses a corrosion-resistant (HD: high-density polyethylene) outer casing, which is not affected by biological and chemical corrosion.
, we can provide pipes with various pipe diameters and insulation thicknesses between D~D and matching pipe fittings (elbows, tees, reducers, fixed joints, etc.) according to user needs
, products Implement the urban construction industry standards / and / standards of the People's Republic of China.
In order to ensure the trinity of prefabricated directly buried insulated pipes, the outer surface of the steel pipe is treated before foaming, and the inner surface of the plastic pipe is corona treated. The rust removal level reaches the medium standard, and the inner surface tension of the outer shell pipe reaches dyne/cm.
The polyethylene outer protective pipe is made of high-density polyethylene material, supplemented by various additives such as antioxidants. The raw materials and product quality are strictly inspected to ensure that the product quality meets /standard and directly buried pipes. The technical requirements of the outer protective pipe improve the overall quality of the outer protective pipe. See the table below for specific technical indicators.
The company is equipped with imported and domestic high-pressure foaming machines and hydraulic pipe threading machines, which improves the overall quality of the product.