Abstract: The invention relates to a draining or venting device for a compensator (15) that has a central interior space (17) and a peripheral formation (16), especially a corrugation (16), which surrounds an interior space (25) of the formation. The draining or venting device comprises a suction means (50) for sucking a fluid out of the interior space (25) of the formation, and a connecting line (30, 47) that establishes a flow connection between the interior space (25) of the formation and the suction means (50), the connecting line (30, 47) running through the central interior space (17) of the compensator (15) and running through a through opening (40) in one wall of a component (19) that is connected to the compensator (15).

Abstract: The invention involves a straight tube heat exchanger 1 with a shell 2, a tube bundle 3 (for the sake of clarity, only two tubes of the tube bundle 3 are shown), two opposite manifolds 4a, 4b, means for introducing and discharging 5a, 5b the first medium into and from the tube space, and means for introducing and discharging the second medium into and from the shell space 6a, 6b, as well as a single-pass expansion joint 7, as it is used, for example, as a preheater in synthesis gas production unit. Both the shell 2 and the two manifolds 4a, 4b are made from heat-resistant, creep-resistant steel, especially a chromium-molybdenum alloy. The expansion joint 7 are made from chromium-nickel steel just like the two welding-ring seals 8. By the expansion joint being made from chromium-nickel steel, the different mechanical stresses are completely absorbed by the high temperature.