Steel-plastic composite pipe
Steel-plastic composite pipe
Steel-plastic composite pipe is a new type of pipeline material developed in recent years. It is made of seamless steel pipe, welded steel pipe, galvanized steel pipe as a matrix, and is compounded with various types of plastics (such as epoxy resin, polyethylene, etc.) .
Steel-plastic composite pipes are divided into plastic-lined pipes and plastic-coated pipes; the plastic-lined pipes are based on steel pipes, and the inner liners are extruded with ordinary resin, and then glued and stringed. Combination; plastic-coated tube is made of steel tube as the substrate, and is coated with polymer material on the inner wall (outside) through powder melting vacuum suction coating or spraying and other processes.
Executive standard:
HG20538-92 "plastic-lined (PP, PE, PVC) steel pipes and fittings"
DL / T935-2005 "Steel-plastic composite pipes and fittings"
CJ / T120-2008 "Water-coated plastic composite steel pipe"
HG / T2437-2006 "Plastic lined composite steel pipes and fittings"
HG / T21562-94 "Teflon-lined steel pipes and fittings"
CJ / T192-2004 "Stainless steel lined steel pipe"
The main types of steel-plastic composite pipes are divided into: GS-—X-SP-T-EP, GS-—SP-T-EP, GS-—D-SP-T-EP (PE)
Steel-plastic composite pipe has the characteristics of steel pipe and the characteristics of plastic
1. Clean, non-toxic, non-corrosive, non-scale, and non-breeding microorganisms;
2. Corrosion resistance, no exudate, no pollution of media;
3. High strength, heat resistance, good pressure resistance, no aging and embrittlement;
4. The inner wall is smooth, does not reduce the circulation diameter (plastic coated tube), and improve the transmission efficiency;
5. The coating has strong adhesion and good impact resistance;
6. Easy to install *, similar to ordinary galvanized pipe;
7. Good weather resistance, adapt to harsh natural environment;
8. Long service life, more than three times that of other steel pipes;
1: Excellent bonding performance:
(1): The polymer material coating developed by our company and the inner and outer walls of the steel pipe and pipe fittings are activated by nanotechnology to make the combination of the two be a combination of physical and chemical reactions, which is not easy to delaminate. Thermal expansion and contraction are synchronized, no wrinkle and cracking.
2: Excellent mechanical strength:
(2): The double-sided plastic-coated composite steel pipe produced by our company has the mechanical strength of the same value as the nuclear naked steel pipe, has a strong ability to withstand impact, bending and pressure, and has a good protective effect on the mechanical force damage.
3: Good hygiene performance
(3): For water, food and alcohol, the company uses polymer composite materials to fully compose the national health drinking water distribution equipment and protective materials health and safety assessment specifications (2007) gb / t17219 coating is non-toxic and odorless, its The hygienic index conforms to the national pipeline standard for drinking water and food delivery.
4: Low fluid resistance
(4): The double-sided plastic-coated composite steel pipes and fittings produced by our company are smooth inside and outside, with small friction coefficient and fast flow rate. The fluid resistance of the medium in the tube is 40%, the plastic-lined tube is 10% smaller, the pressure in the tube is smaller, and the corresponding power consumption is reduced.
5: Excellent temperature resistance
(5): The external wall anti-corrosion material independently developed by our company has excellent anti-ultraviolet radiation, anti-acid, alkali and salt spray corrosion ability, without secondary anti-corrosion, which greatly saves the cost of construction and maintenance, and its life value is the same period as the building.
6: Excellent anti-corrosion ability of the outer wall of the pipe
(6): The civil composite steel pipe fittings produced by our company can be used under cold water, hot water and boiling water for a long time under the temperature of -50c --- 120c. High temperature resistant steel pipe can reach 800c
Application area
Steel-plastic composite pipes are relatively mature and have been widely used in many fields such as petroleum, chemical, construction, shipbuilding, communications, power and underground gas pipelines. They are better products to replace traditional galvanized pipes and are known as green and environmentally friendly pipes.
1. Cold and hot water pipes in urban construction water supply and drainage system;
2. The hot and cold water pipes of the water supply and drainage system of residential and commercial buildings;
3. Natural gas, gas and other transmission pipelines;
4. Liquid transportation pipelines for petroleum, chemical industry, food, medicine, etc .;
5. Agricultural drainage, irrigation and water supply pipelines;
6. Water supply and drainage pipes in industrial papermaking and fire protection systems.
7. Power and communication protection casing.
1. Double-sided plastic coated composite steel pipe for fire protection
2. Double-sided plastic coated composite steel pipe for chemical industry
3. Double-sided plastic coated composite steel pipe for petroleum gas
4. High temperature and high pressure medium conveying double-sided plastic coated composite steel pipe
5. Double-sided plastic coated composite steel pipe for mining
6. Double-sided plastic coated composite steel pipe for buried cable sleeve
7. Wear-resistant double-sided plastic coated composite steel pipe
Connection method of steel-plastic composite pipe
Its specification is DN20 ~ DN600 connection method is flange (loose flange) connection.
1. When installing plastic pipes, the impact of the environment on the installation quality should be considered. When the temperature is generally higher than 40 ℃ or lower than 0 ℃, construction and installation are not suitable;
2. Due to the large linear expansion coefficient of plastic pipes, which is generally about 8 times that of steel, thermal compensation should be considered during installation. Natural compensation is generally the main factor. Glass fiber reinforced polypropylene pipe compensators or PTFE Or rubber bellows expansion joint to compensate;
3. For the pipelines laid overhead, the pipe support should be used. The pipe support can be angled steel. The split steel pipe material can make the pipe freely expand and contract on the pipe support.
4. For buried pipelines, the buried depth is generally less than 0.7m, and it is not affected by ground traffic. The dug pipes should be leveled, and hard objects such as stones, broken bricks, and glass at the bottom and sides of the trench should be clean For the compound soil, use high-quality backfill soil to compact the soil around the pipe, and there should be no gravel infiltration.
