Now the water pipes commonly used in home improvement generally have the following types. According to their own characteristics, they can determine where they are used. This is another point of knowledge for decoration materials.
1, aluminum plastic pipe <br> advantages: corrosion-resistant, non-fouling, temperature and pressure resistance, non-permeability, up to 200 meters long, light weight, easy installation.
Disadvantages: high coefficient of thermal expansion and contraction, poor insulation, water seals within the cassette joints vulnerable, there is a tendency to seepage.
2, copper plastic pipe <br> advantages: the same with aluminum plastic pipe, the length is generally about 3 meters.
Disadvantages: easy to knot green, joints and more.
3, PP-R hot-melt pipe <br> Advantages: Al-plastic pipe, copper-plastic pipe is basically the same, but better insulation than them.
Disadvantages: difficult to install, more joints, easy to leak.
4, pure copper tube <br> advantages: high thermal effect, but the need for insulation, both the advantages of the above three kinds of pipe.
Disadvantages: easy to knot green, difficult to install, easy to leak.
The above-mentioned four kinds of water supply pipes due to different materials, the price difference between the larger, of which the most expensive pure copper pipe, followed by copper plastic pipe.
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Steel poles are commonly used to carry several types of electric power lines, distribution lines and lighting system. Distribution lines carry power from local substations to customers. They generally carry voltages from 4.6 to 33kV for distances up to 30 miles, and include transformers to step the voltage down from the primary voltage to the lower secondary voltage used by the customer. A service drop carries this lower voltage to the customer's premises.
Transmission And Distribution Pole
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