2019雷锋新版跑狗图

The development of plastic pipes in China

Update:31-07-2018
Abst:

The plastic pipe has the characteristics of light weigh […]

The plastic pipe has the characteristics of light weight, corrosion resistance, small loss of water flow and convenient installation, and is favored by the pipeline engineering community. At the same time, the production energy consumption of the plastic pipe is less than that of the conventional metal pipe (generally less than 1:4). Environmental pollution is small and is increasingly being valued by the government and relevant departments.
In foreign countries, plastic pipes are constantly replacing pipes of metals or other traditional materials, and they are developing very rapidly. In the decade from 1980 to 1990, except for plastic pipes, the growth rate of pipes of various materials was less than 2%, but the growth rate of plastic pipes was four times that of other various pipe growth rates, reaching 8%. The demand for plastic pipes entering the 1990s is still growing at a rate of 4.2% per year, and its output value is increasing at an annual rate of 8%.
China has been producing plastic pipes since the 1970s, and it has been promoted and applied in engineering construction since the early 1980s. In the past two decades, plastic pipes have been greatly developed, not only in quantity, but also in terms of variety and specifications. By the end of 1999, there were more than 2,000 plastic pipe production lines nationwide, of which about 15% were imported. In 1999, the production capacity of various plastic pipes in China has reached 1.65 million tons, and the actual output is about 1 million tons. Among them, PVC-U pipe 500,000 tons, accounting for 50%; PE pipe 360,000 tons, accounting for 36%. In recent years, as the construction industry has become an important pillar industry of the national economy and the rapid development of the housing industry, the construction of indoor plastic pipes has developed rapidly and has become a hot spot of investment today.
The development of plastic pipes is mainly based on UPVC pipes and PE pipes, and the development of new composite and modified plastic pipes. In 2010, the main products of plastic pipes should meet the market requirements, the market products are complete, the quality, grade and supporting level have been significantly improved, and the overall level is close to the international advanced level. In the new construction, reconstruction and expansion projects in the country, 80% of the building drainage pipes are made of plastic pipes; 80% of the building water supply, hot water supply and heating pipes are made of plastic pipes; 90% of the wire sheathing pipes are made of plastic pipes; 70% of the building rainwater drainage pipes are used. Plastic pipes are used; 70% of urban water supply pipes (below DN400Inm) use plastic pipes, 70% of village water supply pipes use plastic pipes; 50% of urban drainage pipes use plastic pipes; 60% of urban gas pipes (medium and low-pressure pipes) use plastic pipes.

三中三的全年规律表 2019曾道人图库 管家婆2019综合资料 香港开马资料四不像 天下釆票免费资料大全 仼我发高手论坛 2019雷锋新版跑狗图北京赛车pk10赔率最高的平台 正版香港马会免费大全 智慧彩票投注 资料大全王中王正版