Patent ID: 11859740
Assignee: MONSANTO TECHNOLOGY LLC
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. An annular gasket for a flange joint assembly configured to convey flammable fluid and for inhibiting failure of the flange joint assembly when subjected to fire, the annular gasket comprising:
an annular substrate sandwiched between two annular gasket layers, 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, and each annular gasket layer including:
a radially inner annular gasket segment comprising a first material, the radially inner annular gasket segment configured to form a liquid-tight seal with an opposing flange, wherein the radially inner annular gasket segment is not fire-rated, and
a radially outer annular gasket segment surrounding the radially inner annular gasket segment, wherein the radially outer annular gasket segment is fire-rated for forming a fire-rated seal with the opposing flange and wherein the radially outer annular gasket segment is electrically conductive,
wherein the radial extent of the radially outer annular gasket segment is less than the radial extent of the radially inner annular gasket segment, and
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.