Patent ID: 7533633

Claim:
Process for establishing a connection between steam generator heating surfaces of austenitic material and a vessel ( 5 ); employed as a collector ( 5 , 17 ) or as a distributor comprising: installing pipe nipples ( 1 ) between connecting ducts ( 15 ) leading to the steam generator heating surface and a collector or vessel wall ( 2 ) of a basic body of the vessel ( 5 ) and welding the pipe nipples ( 1 ) in each case with the formation of an axial gap ( 4 ) between the vessel wall ( 2 ) and the pipe nipple ( 1 ) at one end directly to the vessel wall ( 2 ) and at the other end to the connecting duct ( 15 ), wherein the pipe nipples ( 1 ) are each inserted into the outer section ( 7 ) of a stepped connecting bore ( 6 ) of the vessel wall ( 2 ) and in each case one pipe nipple ( 1 ) of a nickel-based alloy is welded to the vessel wall ( 2 ) of a basic body ( 5 ) of a martensitic or ferritic material or a nickel-based alloy and welded to a connecting duct ( 15 ) of austenitic material.