MULTI-SEAL COUPLING FOR A HYDROGEN FUEL SYSTEM OF A GAS TURBINE ENGINE AND GAS TURBINE ENGINE

A multi-seal coupling (50) for fluidly interconnecting a first component (52) and a second component (54) within a hydrogen fuel supply system (40) of a gas turbine engine (10) includes a female joint portion (56) and a male joint portion (58). A first seal (100), a second seal (110) and a third seal (120), all of which are hydrogen fuel seals, are formed between the male joint portion (56) and the female joint portion (58). The first seal (100) is formed by face-to-face abutting contact between a first axially-facing surface (61) of the male joint portion (56) and an axially-facing surface (71) of the female joint portion (58). The second seal (110) is formed by a gasket (76) axially compressed between the first axially-facing surface (61) of the male joint portion (56) and the female joint portion (58). The third seal (120) is formed by a sealant ring (122) disposed between a second axially-facing surface (63) of the male joint portion (58) and an adjacent surface (124) of the female joint portion (56).