Flange joint assembly for flammable liquid

An annular gasket for a flange joint assembly configured to convey flammable liquid and for inhibiting failure of the flange joint assembly when subjected to fire, the annular gasket comprising:

• a first annular gasket layer including a first radially inner annular gasket segment and a first radially outer annular gasket segment surrounding the first radially inner annular gasket segment;
• a second annular gasket layer opposing the first annular gasket layer, the second annular gasket layer including a second radially inner annular gasket segment and a second radially outer annular gasket segment surrounding the second radially inner annular gasket segment;
• and
• a corrugated annular substrate sandwiched between the first annular gasket layer and the second annular gasket layer, the annular substrate being of substantially uniform thickness, and corrugated radially with alternating crests and troughs such that a crest on one side aligns with a trough on the opposite side;
• wherein the first and second radially inner annular gasket segments are configured to form a liquid-tight seal with an opposing flange and are not fire-rated;
• wherein the first and second radially outer annular gasket segments are fire-rated for forming a fire-rated seal with the opposing flange and are electrically conductive;
• wherein the radial extent of the first and second radially outer annular gasket segments is less than the radial extent of the first and second radially inner annular gasket segments;
• wherein the annular gasket is configured to inhibit failure of the flange joint assembly when the flange joint assembly is subjected to a fire temperature between 1400° F. and 1800° F. for a period of 30 minutes;
• and
• wherein, when the annular gasket is uncompressed, the first annular gasket layer and the second annular gasket layer are cohesively positioned on opposing sides of the corrugated annular substrate to enhance friction between the first annular gasket layer and the second annular gasket layer and the corrugated annular substrate and to provide blow-out resistance, thereby inhibiting the first annular gasket layer and the second annular gasket layer from being unseated radially and/or forced radially out of position.