Spiral insulation technology
Spiral pipe insulation method from the start of a process which also suppressed as in the pipe wall plus anti-corrosion coating, can be increased loop resistance, reduce corrosion current;. External DC power supply, the steel pipe caused by the negative potential of the soil, forming a cathodic protection, the potential difference between the anode and cathode can be eliminated, stopped anode and cathode process fundamentally. anticorrosive coating rule table, cathodic protection of the rule of law. But once the anti-corrosion coating is damaged, exposed iron part will accelerate local corrosion. Therefore, anti-corrosion coating and cathodic Protection of this combination is to rid the method table, economical and effective. As stated in the United States and other countries, using the anti-corrosion coating cathodic protection must be used at the same time.
But for the city gas system, due to the dense network of underground pipes, cathodic protection of the external power supply to other pipeline interference, can cause its own benefit, his family victims of the situation. The use of steel pipe connected to the potential negative than the metal material with spiral steel sacrificial anode protection law does not appear such a case, therefore, city gas gas trunk should be used method for preserving and sacrificial anode corrosion coating combination. For other low pressure non-trunk pipeline, the general anti-corrosion coating method directly .
Currently buried gas pipe insulation commonly used anti-corrosion coating outside there are three main PE composite structure, epoxy powder, coal tar enamel, epoxy coal tar and PE tape and other five categories. Layer PE composite structure, epoxy powder preservative excellent coating performance, which is the main European countries anti-corrosion coating of buried pipeline. In our country, from durable life, maintenance costs and other comprehensive economic considerations, the general structure of the preferred three-layer PE composite anti-corrosion coating.
But for the city gas system, due to the dense network of underground pipes, cathodic protection of the external power supply to other pipeline interference, can cause its own benefit, his family victims of the situation. The use of steel pipe connected to the potential negative than the metal material with spiral steel sacrificial anode protection law does not appear such a case, therefore, city gas gas trunk should be used method for preserving and sacrificial anode corrosion coating combination. For other low pressure non-trunk pipeline, the general anti-corrosion coating method directly .
Currently buried gas pipe insulation commonly used anti-corrosion coating outside there are three main PE composite structure, epoxy powder, coal tar enamel, epoxy coal tar and PE tape and other five categories. Layer PE composite structure, epoxy powder preservative excellent coating performance, which is the main European countries anti-corrosion coating of buried pipeline. In our country, from durable life, maintenance costs and other comprehensive economic considerations, the general structure of the preferred three-layer PE composite anti-corrosion coating.
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