Patent ID: 8490399

Claim:
A wall assembly for separating a first fluid at a highest pressure and lowest temperature outside the wall assembly from a second fluid at a lowest pressure and highest temperature inside the wall assembly, the wall assembly comprising: a structural cold wall comprising: an structural cold wall outer side for exposure to the first fluid; a structural cold wall inner side partially defining a first cavity outer boundary; and a structural cold wall aperture for creating a first pressure drop from the highest pressure to a high intermediate pressure within a first cavity; a structural middle wall comprising: a structural middle wall outer side partially defining a first cavity inner boundary; a structural middle wall inner side partially defining a second cavity outer boundary; and a structural middle wall aperture for creating a second pressure drop from the high intermediate pressure to a low intermediate pressure within a second cavity; and a floating wall comprising: a floating wall outer side partially defining a second cavity inner boundary; a floating wall inner side for exposure to the second fluid; and a floating wall aperture for creating a third pressure drop from the low intermediate pressure within the second cavity to the lowest pressure, wherein the floating wall is cooled by impingement of fluid passing through the structural middle wall aperture.