| 主权项 |
1. A fitting assembly for maintaining a leak free seal connection with an associated fluid conduit during and after exposure to extreme heat, the fitting assembly comprising:
a coupling body including an inside surface defining a bore for receiving the associated fluid conduit, said inside surface engaging an outside surface of the associated fluid conduit; a plurality of spaced apart seals including a main seal, an inboard seal, and an outboard seal each formed on said inside surface of said coupling body; and at least one ring annularly disposed on said coupling body urging said main, inboard, and outboard seals into the associated fluid conduit to seal and mechanically connect said coupling body to the associated fluid conduit; wherein said coupling body is made of a first corrosion resistant material having a first coefficient of thermal expansion and said at least one ring is made of a complementary second corrosion resistant material having a second larger coefficient of thermal expansion such that said second material will expand at a greater rate than said first material during heating to a first temperature exceeding annealing temperatures of both said first material and said second material, and said second material contracts at a greater rate than said first material during subsequent cooling to a second temperature below said annealing temperatures thereby restoring compressive and tensile stresses in the associated fluid conduit and said fitting assembly for ensuring that said fitting assembly maintains a leak free seal connection with the associated fluid conduit, wherein said first material includes approximately 70% copper and wherein the second material includes greater than 70% copper. |
