According to statistics, 20% of the total steel output is due to metal corrosion every year in China, and about 30% of equipment is scrapped due to corrosion, which not only pollutes the environment, but also wastes a lot of resources and energy consumption. Pipeline anti-corrosion measures are necessary to prevent the pipeline from being corroded by soil, air and transmission media (oil, natural gas, etc.). Most pipelines transporting oil and gas are in complex soil environment, and most of the media transported are corrosive, so the inner and outer walls of the pipeline may be corroded. Once the pipeline is corroded and perforated, it will cause oil and gas leakage, which will not only interrupt transportation, but also pollute the environment, and may even cause fire and harm.
Therefore, the prevention of pipeline corrosion is an important part of pipeline laying. Huading has spent a lot of energy on anti-corrosion of electric ball valves, and has developed a variety of anti-corrosion methods, especially in seawater desalination projects and circulating water pipes of power plants. Let Hengchang's technicians tell you today that the electric ball valve will not be corroded. The anti-corrosion of the electric ball valve should be reflected in two aspects: 1. the transformation of the product material; 2. take protective measures outside the product. The electric ball valve we use will be corroded after being in the pipeline for a long time, which will lead to serious consequences. How can we prevent the electric ball valve from being corroded?
First of all, we all know that it is necessary to brush anti-corrosion paint if the electric ball valve is to be free from corrosion. But have you ever thought that the anti-corrosion paint will also fail. When the anti-corrosion paint fails, it will not play the role of anti-corrosion, so that its ongoing work will be affected to a certain extent; Therefore, we have developed a new method, which is to add Cr to the electric ball valve. Only the higher the Cr content in the electric ball valve, the stronger its corrosion resistance and the higher its use value will be. When Cr added electric ball valves are used in different seawater and pipe networks, the probability of corrosion is 0%. Therefore, if we want to use our electric ball valve for a long time and make it free from corrosion, we should choose to use Cr. The film coated on the inner wall of the pipe in order to prevent the internal corrosion of the electric ball valve, reduce the friction resistance and improve the throughput. Commonly used coatings are amine cured epoxy resin and polyamide epoxy resin, and the coating thickness is 0.038~0.2mm. In order to ensure that the coating is firmly bonded to the pipe wall, the inner wall of the electric ball valve must be surface treated. So that the coating of the inner and outer walls of the pipe can be carried out at the same time, this anti-corrosion can effectively extend the service life of the electric ball valve of the steel pipeline and save the operation cost of the project.
Anticorrosive and thermal insulation coating: in order to reduce the heat dissipation of the pipeline to the soil, a composite layer of thermal insulation and anti-corrosion shall be added outside the pipeline on the medium and small diameter pipelines for hot crude oil or fuel oil transportation. The commonly used thermal insulation material is rigid polyurethane foam, and the applicable temperature is - 185~95 ℃. This material is soft. In order to improve its strength, a layer of high-density polyethylene layer is applied outside the insulation layer to form a composite material structure to prevent groundwater from seeping into the insulation layer. With the progress of society, enterprises have higher and higher requirements for rust prevention of electric ball valves. In particular, the internal rust prevention is related to our usual drinking water safety and resource safety, so the internal rust prevention standard of steel electric ball valve is the most concerned