Is it necessary to replace the installed gaskets after pipeline heat treatment?
Thread Content
SH3407 specifies that the maximum operating temperature for 304 metal strips is 700 degrees. Since the heat treatment temperatures for alloy steel or stainless steel exceed 700 degrees, does it become necessary to replace the gaskets on pipe flanges that already have proper gaskets such as 304 graphite wound gaskets, after heat treatment? In fact, we will replace the gaskets in the key areas
This post was last edited by CHANGBAISHI on 2020-4-21 06:51 at https://baike.so.com/doc/5655162-5867810.html. There is a table below; it might need to be changed.
What is heat treatment used for when installing gaskets?
The flange welds are being heat-treated, which indicates that the pipeline is still in the manufacturing stage; then what’s the need for installation gaskets?
Change it. Graphite begins to oxidize at temperatures above 400 degrees. For safety.
It can operate in high-temperature and high-pressure conditions, as well as in ultra-low temperature or vacuum environments. By changing the material combination of the gaskets, the chemical corrosion of the gaskets by various media can be addressed. Operating temperature for wound gaskets: -196°C to 700°C (not higher than 600°C in oxidizing media), to prevent gasket failure due to material corrosion or other factors.