Issues regarding the application of asbestos rubber sheets
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Currently, metal gaskets are mostly used in process pipelines. For pipelines with lower pressures, such as those at 1.0–1.6 Mpa, the design calls for the use of asbestos rubber gaskets. However, these gaskets are rarely used these days. Over time, they may lose their sealing properties, absorb the fluid flowing through them leading to leaks, age, and be pushed out under pressure, resulting in damage – among other negative effects. Therefore, I would like to ask if there are any standards or regulations that prohibit the use of asbestos rubber gaskets?
Metal gaskets also need to be selected based on the physical and chemical properties of the contacting medium. Various gaskets are designed for different uses, and can be used as long as they fit within that specific application. The scope of application of a product is the standard you need to use. If a problem occurs, you can turn to the manufacturer, who will be responsible for it. If you prefer a high level of safety and are not concerned about cost, you can also choose precious metals or advanced new materials. For reference.
There are no regulations in standards such as flanges that prohibit their use; generally, similar requirements can be found in the technical specifications of a particular project. I have encountered it before
As asbestos is carcinogenic, its use should be avoided. However, there don’t seem to be any clear regulatory standards stating that its use is prohibited; perhaps the relevant regulations have not yet been updated. The GBT 20801-2006 Standard for Pressure Piping contains relevant restrictions on this matter:
It’s rarely used now; even oil depots no longer use them, along with metal gaskets