The flange surface is damaged; which gasket would be suitable, and how should the sealing surface be repaired?
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Today, while working on a task involving the removal of a flange, I noticed some small pits on the sealing surface :(, but they did not penetrate through the sealing surface; P. It’s a convex flange; currently there are gasket tape and asbestos gaskets available – I’m not sure which one would be better:( . 12\"-300LB, steam. Also, welding is not allowed in this area. Is there any way to repair the flange surface? L?
Asbestos gaskets cannot be used; after repairing with a filler, use wound gaskets
Using gasketing, I think there shouldn’t be any problem with penetration injuries; one can apply things like lead powder or some high-temperature sealant
Wrap gaskets should be used; metal repair compound can be applied first for repair, followed by the use of wrap gaskets
On pressure pipelines using steam as the medium, even if the flange sealing surfaces are in good condition, asbestos gaskets can be blown away during use; therefore, wound gaskets are now generally recommended. Additionally, repairing the sealing surface with a metal repair compound also yields good results.
12\"-300LB; spiral wound gaskets are better for steam use. If it’s not a through-hole damage, there should be no major problem.
What are the types of repair compounds available, and can they withstand high temperatures of 220 degrees?
Use metal repair glue; just search online – many manufacturers produce this type of glue. This adhesive has high strength and is easy to use; after curing, it possesses a linear expansion coefficient similar to that of metals, and it offers good resistance to chemicals and mechanical processing. It is mainly used to fill sand holes and cavities in metal castings, as well as to repair various flat surfaces, bed surfaces, metal pipes, fuel tanks, and oil storage tanks. Asbestos gaskets cannot be used; metal wound gaskets are preferred, and those without reinforcing rings should be avoided! !
Wound gaskets should be used, and metal repair compounds also work well for sealing surfaces. Graphite can also be used to fill small pits; we have used it. The effect is quite good.
If the temperature is not high, it is recommended to use soft PTFE, namely expanded PTFE tape, which can compensate for unevenness on the flange surface.
After repairing and leveling with a metal patch, high-strength asbestos gaskets can be used, and the result is excellent!
The steam pressure is not high, so there should be no problem using asbestos gaskets. But it needs to have the defective parts repaired before use!
Asbestos gaskets can be used with tape, or if welding is permissible, the damaged area can be welded and polished