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| Issue 1292-5 |
| US 6,873,672 B2 |
| Procedure and device for measuring resistance to hydriding of tubes and tubular claddings |
| José Luis Sacedón Adelantado, Madrid (Spain); Eduardo Santamera Gago, Madrid (Spain); Marcos Díaz Muñoz, Madrid (Spain); José Serafin Moya Corral, Madrid (Spain); Elisa Román García, Madrid (Spain); Angel Samuel Pérez Ramírez, Madrid (Spain); and Begoña Remartínez Zato, Madrid (Spain) |
| Assigned to Consejo Superior de Investigaciones Cientificas, Madrid (Spain); and Iberdrola, Madrid (Spain) |
| Filed on Mar. 13, 2003, as Appl. No. 10/388,328. |
| Application 10/388328 is a continuation of application No. PCT/ES01/00350, filed on Sep. 14, 2001. |
| Claims priority of application No. 200002256 (ES), filed on Sep. 15, 2000. |
| Prior Publication US 2003/0185333 A1, Oct. 02, 2003 |
| Int. Cl.7A21C 19/00 |
| U.S. Cl. 376—250 [376/256; 376/305; 376/306; 73/38; 208/107; 208/418] | 2 Claims |
| 1. Method of measuring the resistance to hydriding of tubes and tubular claddings, meaning hydriding the formation of hydrides,
characterized by the following steps:
inserting a tube to be tested through a chamber of ultra-high vacuum equipment, said chamber containing a mass spectrometer
and a total pressure gauge;
passing hydrogen gas or a gas mixture of hydrogen and inert gas(es) into the interior of the tube, the permeation of hydrogen
through the tube wall causing hydriding of the material thereof;
heating said tube by Joule effect heating means;
detecting hydrogen which has permeated through the wall of the tube at the exterior of the tube
by measuring H2 and H partial pressures in the chamber or
by measuring the total pressure in the chamber and determining a permeation time on the basis of a permeation curve, i.e.
a curve of quantity of hydrogen detected
by measuring H2 and H partial pressures in the chamber against time, or
total pressure detected against time, said permeation time being a time obtained from said permeation curve and representing
the first appearance of hydrogen exterior of the tube, and;
detecting a sudden rise in the total pressure, as an indication of the time of appearance of a first micro crack in the tube.
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