Anzeigeverfahren für Wärmetauscherröhre

摘要

To permit individual marking of each of the tubes (10) of a steam generator, it is proposed to mark these tubes with the aid of a binary bar code (12a) formed from circular impressions (24) and absences of impressions. The impressions, formed without removal of material, allow reading of the bar code with the aid of a Foucault-current probe. The impressions (24) can be made on the exterior of the tubes (10), at the time of their production, or on the interior of the tubes after they have been fixed to the tube plate (16). A learning process then makes it possible to assign to each bar code a given position on the tube plate.