Views: 5 Author: Site Editor Publish Time: 2020-09-16 Origin: Site
As indoor gas pipelines have to bear a certain pressure, gas leakage will cause explosions and fires, causing casualties and economic losses. Therefore, the basic requirements for indoor gas pipelines are: sufficient mechanical strength (tensile strength, elongation), good connectivity, and airtightness.
According to GB 50028-2006 "Code for Design of Urban Gas", the selection of indoor steel pipes should meet the following requirements:
1) The low-pressure gas pipeline should use hot-dip galvanized steel pipe (hot-dip galvanized), and its quality should comply with the current national standard "Welded Steel Pipe for Low-Pressure Fluid Transport" GB/T3091;
2) Seamless steel pipes should be used for medium and sub-high pressure gas pipelines, and their quality should comply with the current national standard "Seamless Steel Pipes for Fluid Transport" GB/T8163; when the pressure of gas pipelines is less than or equal to 0.4MPa, they can be used. The welded steel pipe specified in item 1) of this paragraph.
Indoor gas pipelines should be steel pipes, copper pipes, stainless steel pipes, aluminum-plastic composite pipes and connecting hoses can also be used.
At present, domestic indoor gas pipelines are still mainly galvanized steel pipes. The main advantage of this installation method is that the material cost is slightly lower; the disadvantage is that the installation speed is slow, and it is easy to rust and corrode. After installation, an anti-corrosion paint treatment is required every 3 or 5 years. . The service life of hot-dip galvanized steel pipe is only about 25 years.
Although galvanized steel pipe has many shortcomings, it still occupies a dominant position in indoor gas pipelines due to its strong resistance to extreme conditions such as lightning strikes and impacts and high safety performance.