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The fire fighting special coating plastic steel pipe manufacturers to usher in environmental protection production, prices continue to rise high trend
Source: | Author:kanglong | Publish time:2017-08-19 | 1110 Views: | Share:
With the development of fire pipeline in 2017, plastic coated steel pipes are widely used in construction water supply and drainage, drinking water distribution, fire fighting pipeline and other projects. most of the steel pipes for fire pipes are hot - dip galvanized steel pipes.
With the development of fire pipeline in 2017, plastic coated steel pipes are widely used in construction water supply and drainage, drinking water distribution, fire fighting pipeline and other projects. most of the steel pipes for fire pipes are hot - dip galvanized steel pipes. now, many high - end districts, hotels and offices have become one of the main products of the new industry in the 21st century. the fire - painted plastic pipes is a new type of fire fighting pipes. because of its outstanding features, environmental protection and energy - saving, it is included in the national standard, and this is the first time that plastic coated steel pipes are coated with plastic pipes The earliest application of this kind of internal and external coating plastic steel pipe is the subway station in Shanghai, which is used as fire supervisor road, so far more than five years, the use of the pipeline is still good, which is a strong proof of its advantages. now the plastic coated steel pipe has become a real fire protection pipe, so the future development prospects are considerable. Although the fire - painting plastic pipe is not fully used in the field of fire protection, but it has been recognized by the state, and after all the plastic coated steel pipe is the future trend, so the pipeline has a very high development value in the country. Why is it accepted by the state? Be included in fire control standards? The reason is that the pipeline itself has strong corrosion resistance, internal rusting is not blocked, and the later period is not to be maintained, the service life is more than 50 years. So far, no pipeline can be like fire - coated steel pipe, such as high cost performance and long service life.
　
Coated steel pipe has a strong resistance to interference, this is a kind of cable casing, for the rest of the signal if the interference will have a shielding effect. This kind of steel pipe has good resistance to pressure, and has good insulation performance, it is mainly for the protection of the wire, so the leakage of the situation is impossible to occur. The coated steel pipe manufacturers so far have been changing these advantages, with a smoother tube wall, no burr, in the construction, suitable for crossing the cable, or through the wire. Plastic coated steel pipe technology is very mature in the industrialized countries abroad, and coated plastic steel pipe has been widely used in many fields such as petroleum, chemical industry, building, shipbuilding, communications, power and underground gas transmission pipeline, such as the United States, Japan and other countries of the water pipeline has 80 % to 90 % of the pipe to use coated plastic steel pipe. This technology in China is just emerging, the production of coated steel pipe is still in the initial stage of products, the use is small, but its potential market is very large. The design requirements of the welded internal and external plastic coated steel pipe joints are required, and the end of the welded internal and external plastic coated steel pipe joints shall be installed with a rust resistant high temperature resistant layer. The antirust high temperature resistant layer uses a high melting point of the Bai gang pipe, in the field welding, the welding parts will not be damaged, and the Bai gang is only installed at the end of the pipe, hardly increasing the cost of the pipe. Inside and outside plastic coated steel pipe in recent years, with its superior performance, the form of development is better and better, we can see in our daily life, it is mainly used in gas, residential area drainage and water transport aspects, internal and external plastic coated steel pipe has the characteristics of ordinary steel pipe, its main characteristics are mainly, corrosion resistance, wear resistance and so on. Its service life and excellent performance are more outstanding than ordinary steel tubes. Compared with the internal and external plastic coated steel pipe, the common pipe is relatively poor, so it is not widely used, but the new type of internal and external coated steel pipe has corrosion resistance and wear resistance, it is widely used, especially for some engineering projects requiring corrosion resistance and high pressure resistance, the internal and external plastic coated steel pipe has played its excellent performance. At the same time, its service life is much higher than ordinary pipes.

A. fire - fighting internal and external plastic pipe characteristics:
( 1 ) high mechanical properties. Epoxy resin has strong cohesive force and dense molecular structure, so its mechanical properties are higher than the general thermosetting resin such as phenolic resin and unsaturated polyester. ( 2 ) the coating of the firefighting fire pipe adopts epoxy resin, with strong adhesion. Epoxy resin curing system contains active epoxy group, hydroxyl group and ether bond, amine bond, ester bond and other polar groups, which endows epoxy resin with excellent adhesion to metal, ceramics, glass, concrete, wood and other polar substrates. ( 3 ) the shrinkage rate is small. Generally 1 % ~ 2 %. It is one of the varieties with the lowest cure shrinkage rate in the thermosetting resin ( 8 % ~ 10 % pf ). Unsaturated polyester resin is 4 % ~ 6 %; Silicone resin is 4 % ~ 8 % ). The linear expansion coefficient is also very small, generally 6 × 10 - 5 / ℃. So the volume changes little after curing. ( 4 ) technology is good. Epoxy resin curing basically does not produce low molecular volatile, so can be low pressure molding or contact pressure molding. It can cooperate with various curing agents to make environment-friendly coatings such as solvent-free, high solid, powder coatings and waterborne coatings. 

B. the fire fighting inside and outside the steel pipe has the following advantages. 
1. the steel degree and strength of the traditional metal pipe are reserved, which is much better than the plastic pipe and aluminum plastic pipe; 2. has the characteristics of smooth inner wall and small friction resistance, and the outer wall is more beautiful and luxurious; 3. light weight, good toughness, impact resistance and high pressure strength; The applicable temperature is wider - 30 ℃ ~ 100 ℃; 4. the connection way of the pipe fitting can be used as the hinge, socket, flange, groove, welding, etc., many ways, save labor and labor; 5. the coefficient of thermal expansion of the connecting part of the pipe fittings is less than the coefficient of thermal expansion, and is more safe and reliable; 6. the price performance ratio is reasonable, the comprehensive cost is low, the copper tube and stainless steel tube are more economical. The steel belt in the middle of the steel belt has been hit a lot of holes, make the inner and outer layer of PE organic integration, solve the steel and plastic composite problem, but at the expense of the steel tube's resistance oxygen performance, and because of the existence of the steel belt, it greatly reduced the pressure strength of this type of steel plastic steel tube, under the high pressure working conditions, it is easy to appear tube burst.
 
C.  the performance index of the plastic steel pipe for internal and external fire fighting; 
1. adhesion of coating: the adhesion of polyethylene coating layer is ≥ 30 n / cm, and the adhesion of epoxy resin coating is 1 ~ 3 grade. 2. bending performance: the nominal diameter is not more than 50 mm steel plastic steel pipe is bent, no cracks occur after bending, and no stratification occurs between the steel and the internal and external plastic layers. 3. flattening performance: the steel plastic steel pipe with a nominal diameter greater than 50 mm and not more than 600 mm shall be compressed, and no cracks shall occur after flattening, and no stratification shall occur between the steel and the internal and external plastic layers. 4. health requirements: the inner plastic layer of the steel plastic steel pipe conveying the drinking water and cold hot water shall meet the requirements of GB / t 17219. 5. the pinhole test of the coating plastic layer: the whole inner and outer surface of the steel pipe of the test shall be inspected with an electric spark tester, and the electric spark shall not be generated. 6. fire resistance performance test: the steel plastic steel pipe for fire fighting shall be able to withstand the fire resistance performance test for 15 min, and shall be free of leakage and deformation after test. 

D. there are three common methods for the connection of the internal and external smear steel pipe, namely screw connection, flange connection and groove connection. 
Thread connection is the most traditional form of the use of DN15 - 100, the cohesion technology is divided into set of silk, deburring, lining plastic pipe chamfering, cutting, screw corrosion, cohesion and other steps. The length of the set of silk is different according to the use of the pipe, but one point is the same, that is, to ensure that the end of the tube and the root of silicone rubber touch, and the shape into a secondary seal. The pipeline device with working pressure ≥ 1.6 can be applied, the advantage of threaded connection is that the cost is low, the operation is simple and convenient, but it is easy to be restricted by caliber. Flange connection is a relatively good sealing method, but because of the better cost, has been gradually replaced by other methods of convergence, more use in the chemical industry. In the connection of practice, the lining material must be connected with the end face of the flange, and ensure the complete separation of the fluid and steel pipe in the pipe, so as to be safe and reliable. The flange connection can be applied to various pressure piping devices. Groove convergence, this is the most popular of the three current convergence. This kind of next year will be directly in the steel plastic composite pipe groove, the scale of the groove is changed with the size of the pipe, more suitable for working pressure ≤ 2.5 MPa pipeline device. Compared with other cohesion methods, the groove of coated steel pipe does not need to be fixed, more convenient. " although the profits of steel have been diluted, there is still room for it. The steel mill still wants to speed up production as soon as possible to cash profits. Some intermediate frequency furnace, electric arc furnace and so on are also accelerating production. " it is clear that the current price decline is the result of lower demand for steel. When the output increased, the demand of the market did not rise, the consumption of products did not significantly increase, so the steel price to go weak is reasonable. At present, the growth rate of industrial investment is very low, and the demand for iron and steel is low. The demand for iron and steel is mainly based on the national railway, roads, bridges and other infrastructure investment.

E. the plastic coated composite pipe for the fire - fighting underground pipeline has the following advantages:
1. the firefighting composite pipe of the fire protection pipeline is superior to the antistatic property, and its internal and external surface resistance is less than 1 × 106 Ω, reaching and exceeding the relevant national and industrial standards

2. the flame retardant property of the mine is added with flame retardant, and its flame retardant performance index is in accordance with the national standard. And its steel - plastic composite structure, the flame retardant performance is better than pure plastic pipe, suitable for the underground flammable, explosive and other places. 

3. the clad pipe pipe used in the fire protection pipeline has superior mechanical properties and can withstand the harsh conditions of use

4. corrosion - resistant, non - scaling, corrosion - resistant, non - scaling, especially suitable for the underground transportation of high sulfur water quality and transportation of calcium and magnesium plasma. The service life of the firefighting composite pipe used in the fire protection pipeline is much higher than that of other pipes. 

5. the connection is convenient and reliable. the steel - plastic composite pipe can completely overcome the shortcomings of the pipe connection of pure plastic mine, and can be connected with the steel pipe and valve, such as flange and quick joint, etc., with strong interchangeability. 

On the 17th, the main futures of the Double varieties were Again into hot search varieties. it appeared that all varieties of black series were followed up by the price of Double varieties. as of the 17th, the main contract of coking coal rose 7.97 %, the main contract of coke increased by 6.35 %, the main contract of iron ore increased 5.62 %, rebar futures increased by 2.12 %, and the black line futures were all red. Driven by the strong rise in the futures market, domestic steel, coke and iron ore spot market appeared to rise in different degrees in 17 days, individual iron and steel enterprises raised the price of steel in a row, merchants rose the price willing to highlight, coke varieties have a sharp rise in the state, the average increase of 80 yuan. The high price of coking coal variety futures prices, to the related varieties and market formation of " butterfly effect ", the rise in the momentum of proliferation. There is no more than the influence factors behind the big jump in coking coal.

The hot spot of coal coking market began with the " capacity to capacity" policy in the coal industry, and has been out of the decline since 2016, and rejuvenated. In the spot and futures market plays a decisive role, starting in 2017, the coal industry to capacity work more overweight, the continuous introduction of relevant policies, a few days ago, the national development and reform Commission, the national energy bureau and other 16 ministries jointly issued the " on the promotion of supply-side structural reform to reduce the risk of coal consumption to reduce the risk of overcapacity," and announced the scale of coal and electricity regulation and the construction of coal motor units and suspended projects in the provinces. A total of 111 million tons of coal were withdrawn in the first half of 2017, 74 per cent of the full-year mission, and more than 400 million tons of coal capacity, according to data released by the national development and reform Commission. 

Therefore, the coal to the capacity work, also increased the expectations of the tight coal supply, make the spot price of coking coal is easy to fall, the futures market is bullish expectations, and the futures market is bullish on expectations, and the large injection of funds, " supply and demand determine the direction of price fluctuations, capital determines the range of price fluctuations," the coal varieties are due to tight supply and demand, and the stage of fund injection, resulting in the coking coal commodity futures prices continue to climb, the spot market price is higher.


At the same time of " coal to capacity" policy, all localities are to implement the air pollution prevention and control work of the Ministry of environmental protection, so as to limit the transportation of coal, and the transportation of coal set port resources from automobile transportation to fire transportation. According to the policy of the national Ministry of environmental protection of the Beijing - Tianjin - Hebei province and the surrounding area of 2017, and the opinions of Hebei province on strengthening the comprehensive control of atmospheric pollution, as of August 15, the port of Bohai bay was completely banned from the operation of coal transportation. Opening Shanxi Shuozhou, an, Li Jiaping, Datong; Inner Mongolia Wuhai, Ordos new street, Baotou, Ha alley, gong, Sara, Hohhot, Xinjiang three and other 15 railway lines, the coal supply hinterland to the luyanshen to Shanxi, inner Mongolia, Xinjiang and other places. Although the situation of environmental pollution caused by coal transportation is improved to a certain extent, the situation of fire transportation capacity is not evaluated at present, and the transportation of other kinds of goods transportation in the transportation, there will be a situation of tight transport capacity, it is likely to aggravate the situation of coal supply tension in a short period of time. To this end, coal is expected to continue to increase space, making the spot market is quite strong. 

From the above two key points can be seen, the coal industry is significantly affected by the policy, " to capacity" policy to restore the coal industry, the follow-up environmental protection policy to the coal industry more conducive to the effect. As a result, the coal and coke varieties market increase power is highlighted, the trend is ahead of the high point of the momentum, the late market is expected to continue to increase space.