Problems with gaskets when installing blind flanges
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Experts: When installing blind flanges, should gaskets be used only on the side with fluid, or must they be used on both sides? Is there any difference between adding on one side and adding on both sides?
Personally, I think it depends on the function of the blind plate being used. If it is only necessary to isolate one side where the medium is present while allowing air to flow on the other side, and work in a confined space or involving open flames is required, then a blind plate can be installed on the side with the medium. Of course, it’s best to add them on both sides. When installing blind plates, it’s important to note the following: First, sturdy materials must be used; in China, there have been cases of poisoning incidents caused by holes in blind plates ； II. The flange bolts of the installed blind plate must be tightened; it is not sufficient to simply insert the blind plate in place.
When designing, both elements are present; in my opinion, they should indeed be there on both sides. Since blind plates are used, there must be mechanisms for opening and closing them. If no gasket is used on the surface that does not come into contact with the medium when it is closed, then friction between two steel surfaces will occur, which will inevitably cause wear on the sealing surface. This can lead to poor sealing once the device is opened again.
According to our procedures, it is necessary to apply it to both sides; if it is applied to one side only while the other side is not, the steel surfaces in contact are prone to damage. Moreover, after the bolts are tightened, thermal expansion and contraction can cause them to loosen, resulting in failure of the seal on the other side as well and leading to leaks. If you want to save costs, you can use old gaskets or asbestos gaskets on the side that does not need to be sealed (apply butter to both sides of the asbestos). But if both sides of the blind flange are under pressure and serve a sealing function, new proper gaskets should be used in the end.
It is best to add them on both sides, so that the sealing effect is maintained even if the blind plate is not perfectly flat
When learning on a personal level, it’s necessary to use both methods, whether for preventing leaks or for avoiding wear on the sealing surfaces. Of course, the bolts used in this process must be tightened properly! ~·
Shims need to be added on both sides. First, it ensures good sealing; second, it protects the contact surface.
It needs to be added on both sides! However, in my opinion, it is necessary to add a good seal on the side with a medium, while a regular one is sufficient on the open side to protect the sealing surface. Of course, some things still need to take into account the actual situation! !
Gaskets need to be added on both sides, but even with gaskets in place there is no guarantee that leaks will not occur; therefore extra care is required. If it is a critical pipeline, the gaskets should be aligned properly when installing them, and it is best to stick tape to the flange surface (usually with the valve in an upright position), and then tighten everything up.
Gaskets must be installed on both sides depending on the pressure conditions; gaskets are essential on the side where there is a medium, while gaskets such as asbestos or graphite can be used on the side without a medium. Make sure the bolts are tightened properly