PVC pipe production, application and development trend

Rigid PVC pipe, pipe fittings in many PVC products, a trend of rapid growth in China, is one of the biggest variety of all kinds of plastic pipes in consumption. PVC pipe through the promotion of recent years, in our country, especially in the relevant national policy support, PVC pipe production and application, great progress has been made in PVC pipe production has accounted for more than 50% of the plastic pipe material production, is widely used in industry, construction, agriculture and many other industries.

PVC pipe developments

1.1 PVC pipes

In general in the production of resin, PVC resin consumption of ethylene production, the production cost is the lowest. Domestic production of PVC to consumption per ton ethylene 0.5314 tons, ethylene and polyethylene average consumption per ton of 1.042 tons, domestic PVC resin of ethylene consumption of per ton less than polyethylene consumption of about 50%. And the production of PVC raw materials of chlorine gas, is an important approach to balance the production of caustic soda produced chlorine, caustic soda is an essential part of the national economy important raw materials. In addition, from the perspective of the plastic PVC has good compatibility with various additives, in the production of tubing can be added to a large number of cheap packing, the production cost is reduced greatly.

Per cubic meter for the production of PVC pipe compared with metal pipe, PVC and production per cubic meter of steel and aluminum, steel consumption of 316 kj/m3, the energy consumption of the aluminum is 619 kj/m3, PVC power consumption of 70 kj/m3, that is, the energy consumption of the steel is 4.5 times that of the PVC, aluminum power consumption is 8.8 times of PVC. And the process energy consumption in the production of PVC pipe also is only a third with diameter metal pipe. At the same time due to the jiangyin PVC pipe wall is smooth, does not produce corrosion tumor, water conveyance efficiency is high, used for transfusion can power saving 20%. PVC pipe has good mechanical properties, and have excellent corrosion resistance, in the process of using light weight, easy installation, does not need to maintain, and use steel for the utility of water pipe, in use process due to corrosion, must often coating paint, high maintenance costs. General construction and utilities with metal pipe need to change 20 years or so, while processing a good PVC pipe, the service life of 50 years, etc. Therefore, PVC pipe is a kind of low production cost, high strength, good corrosion resistance of the plastic products.

Generally speaking, in terms of sewage, waste water and ventilation pipe, PVC pipe than using iron pipe installation and saving Labour cost about 16-37%; For the use of conduit than metal wire casing save cost 30-33%; And function of chlorinated polyvinyl chloride (PVC) pipe in hot and cold water, than use the same size of the copper tube to save cost for the 23-44%. Due to the advantages of PVC pipe, therefore, all countries in the positive development and promotion of PVC pipes.

1.2 PVC pipe production and consumption

Since the eighty s, China has introduced thousands of different types of PVC pipe extrusion production lines, have sprung up like high shide, zhejiang yong, Shanghai tomson larger pipe manufacturers. At present, the UPVC (hard PVC) pipes, pipe fittings factory has more than 600, the total production capacity of 1.1 million tons/year of above, the scale of production in more than 10000 tons/year manufacturer with more than 30, size in 0.5 10000 tons/year factory has more than 60, UPVC pipes, pipe fittings production equipment basically realize the localization.

In our country, PVC pipe with PE and PP pipe development early, many varieties, excellent performance, with wide, occupies an important position in the market. By the end of 1999, the national plastic pipe production line more than about 2000, including the introduction of equipment accounted for about 15%. In 1999 our country all kinds of plastic pipe production capacity of more than 1.65 million tons/year, actual output 1 million tons, including UPVC pipe for more than 50%.

Over the years, in the PVC market applications, to building materials market as the largest, and fastest and increase speed. In recent years, the United States have been accounted for 60% of the total products building materials products, Western Europe at 62%, Japan was 50%, the ratio is less than 30% in China, the rising space is very large. In building materials products, and give priority to with pipes and profiles, including building up and down pipes, agricultural irrigation pipe, gas pipeline, oil pipeline, etc.

Production and application of the UPVC pipe in our country during the "ninth five-year really started to get rapid development, mainly thanks to the government's vigorously support and the social awareness of UPVC pipes.

At present, the application of plastic pipe not only in quantity but also got great development on the varieties and specifications. Such as UPVC pipe in some cities building drainage applications has reached more than 90%, the vast majority of UPVC pipe enterprise benefit is very good in recent years.

During the "tenth five-year plan, the application of plastic pipe are mainly composed of UPVC and PE plastic pipe, and vigorously develop other new type of plastic pipe. By 2005, in the building, rebuilding and expansion projects, construction drainage pipe 50% using plastic pipe, urban drainage pipe 20% using plastic pipe, building water supply, water supply and heating pipe 60% using plastic pipe, urban water supply pipe (below Dn400) 50% by plastic pipe, rural water supply pipeline 60% using plastic pipe, city gas pipeline (low pressure pipe) in 50% by plastic pipe, building wire threading casing 80% using plastic tube. Plastic tubing demand in 2005 about 2 million tons, mostly for PVC pipes. Jiangyin double gold band saw blade

In developed countries, the PVC pipe consumption generally accounts for 70-80% of plastic pipe market, and PVC pipe in our country accounts for only about 50% of the total amount of plastic pipe, PVC pipe in our country's development potential is very huge. The developed countries, the proportion of consumption all kinds of PVC pipes is: water supply pipe (33%), accounted for 22.3%, disengage the tubes for 15.7%, 5.2% irrigation pipe, gas pipe (0.8%), other pipe (22.7%). The pipe with pipe consumption ratio is about 1:8.

In the construction market, the use of the PVC pipe has two kinds: one kind is pressure tube, one is a no pressure tube. In the past the use of cast iron pipe and copper pipe as a general pressure building materials, corrosion is serious, not only and require constant maintenance and replacement, the cost is higher. Foreign construction is now widely used in pressure water pipe and hot water supply pipe mostly use PVC pipe. Small diameter PVC pipe, UPVC pipe, CPVC) has a low cost, corrosion resistance, do not need regular maintenance and replacement, etc. Pressure and large diameter PVC tubes, 100-900 - mm in diameter () instead of cast iron pipe, the increase of small pipe, good water system flow, corrosion resistance, low weight. Power saving, good water quality. With PVC foam core layer without pressure pipe as the indoor plumbing and water system, can well solve the problem of the noise of the indoor plumbing. Utilities drainage pipe by pressureless PVC pipe, corrosion resistance, is not affected by the erosion of hydrogen sulfide, long service life, light weight, low cost of installation, easy connection and sealing, not easy to break. In addition, building cross tube and underground cable protection pipe and PVC pipe another market, the current domestic use of varieties is direct expansion pipe, double-wall pipe and single wall corrugated pipe.

Agricultural pipes is PVC applications and a wide field. In China belong to resource shortage country, at present, most of the farmland in China is also the earth canal irrigation, water waste is very serious. Due to lack of water, a large number of cultivated land is not very good irrigation, crop yield is low. The use of PVC pipe irrigation, can water saving is about 50%. And a fixed or semi-fixed PVC farm irrigation system, not only save water, and can increase production, equipment corrosion etc, not to save cost and spray irrigation facilities greatly. A county at present, our country has not yet been completely solid tube filling, in most of the country to the fed also lack basic understanding, therefore, will intensify propaganda and promotion of PVC tube filling in the countryside, its great potential.

1.3 PVC pipes are at home

Is the biggest application of UPVC pipe, UPVC pipe construction. At present in the provinces of the nation's tap water pipe system and residential water pipe on the popularization and application, in the construction industry is mainly used as a drain on, storm sewer, and threading pipe. UPV tube with resistance to chemical corrosion, self-extinguishing and flame retardant, resistance to the first sex good, wall smooth, performance is good, but the UPVC pipe low toughness, linear expansion coefficient is big, using a narrow temperature range. Development of UPVC pipe, the production and use of UPVC pipe energy-saving 55-68% than the cast iron pipe production and use of energy saving 62-75% than galvanized pipe, UPVC pipes and with the specifications and the price of per unit length is only 1/2 of the galvanized pipe, 70% lower than galvanized pipe installation cost, use 1 ton can replace 12 tons of cast iron pipe, UPVC pipes application 1 tons of UPVC bellows can save 25 tons of steel.

Core layer foam pipe: core layer foam pipe is a three layer, a total of extrusion process in the production of inside and outside two layer is the same as ordinary UPVC pipe, the middle is the relative density is 0.7 0.9 low foaming layer of a new type of pipe, the ring to the rigid is 8 times of ordinary UPVC pipe, and the temperature changes when the feet have good stability, good thermal insulation, especially foam core layer can have cut off the noise transmission, more suitable for the high-rise building drainage system.