Selection of high-temperature and high-pressure gaskets
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The hydrogenation unit in our facility operates at a temperature of 460 degrees and a pressure of 220 kilograms. Many of the pipelines on site are made of TP347 material, as are the flanges. However, we encountered a problem regarding the selection of gaskets. In the design, some gaskets are made of TP347 material, while others are made of 304 material. The hardness of these two types of gaskets is the same; so what is the criterion for making such a choice? Temperature or pressure?
TP347 should be used in applications where resistance to intergranular corrosion is required, as 304 offers less resistance to intergranular corrosion compared to 347. Therefore, check whether the areas where 347 is used are prone to severe intergranular corrosion.
The answer above is correct; it mainly depends on the degree of corrosion! Generally, both 304 and 347 meet your application requirements. Temperature and pressure determine the structural type of the gasket ；
The pressure rating is up to 1500 pounds, and 460 degrees is considered a high temperature. Both wound gaskets and toothed gaskets will work fine. It is the packing and lining materials that provide sealing performance; it’s advisable to choose materials that can withstand high temperatures. For your application conditions, 304 steel is less resistant to intergranular corrosion than 347 steel. Metal ring gaskets can also be used; the material should be softer than that of the flange to prevent damage to the flange. If you want more details, we can discuss this further