Patent ID: 7942452

Claim:
A flange fitting for an inner fluid conduit and an outer fluid conduit surrounding the inner fluid conduit, the flange fitting comprising: a flange body inner portion around an opening of the inner fluid conduit, wherein the flange body inner portion includes an inner sealing face surface configured to mate with a cooperating flange fitting; a flange body outer portion around an opening of the outer fluid conduit, wherein the flange body outer portion includes an outer sealing face surface configured to mate with the cooperating flange fitting and a back surface opposite the sealing face surface; a spoke structure extending between the flange body inner portion and the flange body outer portion across the opening for the outer fluid conduit formed between the flange body inner portion and the flange body outer portion; an inner leak detection passageway formed in the flange body inner portion, the inner leak detection passageway terminating at the inner sealing face surface; and an inner leak detection port formed in the flange body inner portion, the inner leak detection port in fluid communication with the inner leak detection passageway and in fluid communication with a first outlet on the back surface of the flange body outer portion via the spoke structure, and the first outlet being configured for fluid communication with a leak sensing apparatus.