Stainless steel flanges are widely used in the petroleum industry, water and natural gas pipelines, from most corresponding pressures. This kind of thin bellows is generally welded process, because it is too thin, about 0.2 mm, difficult to weld process.
Welding process includes welding, brazing, etc., stainless steel flange or other pipeline arc welding process, that is, the arc can not directly point to the bellows, but is arc hot melt welding on the bellows.
Preparation before welding stainless steel flanges
Remove oil and other dirt from stainless steel corrugated flange. Assuming the welding process flange and leakage, the original welding process scars should be eliminated, the straight pipe of the flange should be polished and polished metal luster, the straight pipe of the bellows is too thin and can not be polished, ground and cleaned, and the light should be polished and polished with a manual emery cloth.
Arc forward in the flange tube is essential. The arc refers to a very thick pipeline, the arc flame is used to heat the bellows, the edge of the bellows is blocked with welding wire, and the stainless steel welding wire is dissolved. Should be welded process thick wall pipe, select short welding or spot welding.
In the welding process, the melting standard of the bellows should be consulted at any time, under normal circumstances, 1 time should be melted 1 or 3 molten pools, so it is not suitable for 1 time to 1 welding process. Especially in the case of large open space, it is very easy to burn through.
Flange leakage problem
If the flange leakage problem can not be treated in time, the leakage will expand rapidly under the erosion of the medium, resulting in the loss of materials, the destruction of the production environment, leading to the shutdown of the enterprise, resulting in huge economic losses. If it is toxic and harmful, flammable and explosive media leakage, it may cause major accidents such as poisoning, fire and explosion.
The traditional method to solve the leakage of stainless steel flat welded flange is to replace the sealing element and apply sealant or replace the flange and pipe, but this method has great limitations, and some leakage is limited by the requirements of the working environment, can not be solved on-site.
Polymer composite materials can be used for on-site plugging, among which the application is more mature with the Fushi blue system.
It is an ideal method, especially in flammable and explosive occasions, but also to show its unique. The construction process of polymer composite material technology is simple, and the cost is low, which can solve most of the flange leakage problems for enterprises, eliminate hidden dangers, and save more maintenance costs for enterprises.
