How effective is it in improving the fire resistance of flexible graphite gaskets?
Thread Content
As a gasket for pipes in HG/T20606-2009, does the reinforced flexible graphite sheet tend to leak in case of a fire? . Graphite is a material with a high melting point, but it is not clear whether reinforced flexible graphite sheets will deform significantly under the high temperatures of a fire. In environments with a fire hazard, wound gaskets are preferred for pipes where leakage is not desired; however, wound gaskets are available at a minimum for PN16 grades, while for pipes of PN10 grade, only graphite gaskets can be used.
Enhanced flexible graphite gaskets possess better temperature resistance and mechanical strength compared to pure graphite gaskets, due to the reinforcing layer made of metallic material. Although graphite itself has a high melting point and good fire resistance, under the high temperatures of a fire, the reinforcing materials may be damaged, leading to a decline in performance. Deformation and leakage are indeed possible, especially when the temperature exceeds the design value. In environments with fire risks, if leakage is a concern, it is indeed necessary to choose gaskets that meet safety requirements. If reinforced flexible graphite gaskets are used, it is necessary to consider the fire resistance rating and operating temperature range of the gaskets to ensure safety. For PN10 grade pipes, if spiral gaskets are not available, special attention should be paid to the fire resistance and applicable range when selecting graphite gaskets. .