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AssigneeHitachi Power Europe GmbH
InventorsMartin Becker, Dietmar Hettkamp, Ralf-Udo Husemann
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The invention relates to the establishing of a connection between steam generator heating surfaces made of austenitic materials and a collector and/or distributor made of martensitic or ferritic materials or of a nickel-base alloy. In order to extend the expectation of serviceable life of the connection, the pipe nipple of the reservoir used as a collector or distributor is made of a nickel-base alloy and directly welded to the collector wall in such a manner that an axial gap remains between the connecting branch and the collector wall. In a connection of the aforementioned type between steam generator heating surfaces made of austenitic materials and the pipe nipple or the pipe nipple and the collector made of martensitic materials, the coefficient of expansion of the material of the pipe nipple has a particularly good effect upon the serviceable life of the entire connection.
Process for establishing a connection between steam generator heating surfaces of austenitic material and a vessel (5);
Vessel (5) forming a collector (5, 17) or distributor including pipe nipples (1) inserted into a vessel wall (2) of a vessel basic body (5) with the formation of an axial gap (4) between the vessel wall (2) and the respective pipe nipple (1), which pipe nipples (1), at one end, are welded directly to the vessel wall (2) with the formation of a welding seam (3) and, at the other end, can be welded each to an austenitic connecting duct (15) leading to a steam generator heating surface,
Dependencies are inferred from the claim text.