| 摘要 |
An annular, chemically nonreactive shell 18 is formed with a base 42, a radially inwardly disposed surface 28 and with a pair of sidewalls 30, 32 that are raised relative to the base. A fire resistant, intermediate core 20 is formed with an annular body 36 and with a radially outwardly projecting end 34. A substantial portion 24 of the core 20 is mounted between the sidewalls 30, 32 of the shell. When installed between opposing pipe flanges 12, the radially inwardly disposed surface 28 of the shell 18 is compressed between the pipe flanges 12 adjacent to the bores of the pipes 14 and provides a fluid tight seal to prevent a process stream 16 from reaching the core. Likewise, the sidewalls 30, 32 are compressed by the pipe flanges 12 and, in turn compress the core portion 24 disposed therebetween. The outer end 34 and a radially outwardly disposed portion 26 of the core 20 expand to protect the shell 18 from heat and flame.
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