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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 OBS

Seam testing methods ... Electronic methods are the newest of the methods used to evaluate seam integrity. The ultrasonic pulse echo technique is basically a thickness measurement technique and is only for use with nonreinforced geomembranes. Here a high-frequency pulse is sent into the upper geomembrane and (in the case of a good seam) reflects off of the bottom of the lower one. If, however, an unbonded area is present, the reflection will occur at the unbonded interface. The use of two transducers, a pulse generator, and a CRT [cathode-ray tube] monitor are required.  1, record 1, English, - pulse%2Decho%20seam%20test

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 OBS

Contrôle d'étanchéité de soudure sur membrane bitumineuse au moyen d'une cloche à vide.  2, record 1, French, - contr%C3%B4le%20d%27%C3%A9tanch%C3%A9it%C3%A9%20de%20soudure%20par%20%C3%A9chographie

Record number: 1, Textual support number: 2 OBS

Double soudure: Modalité d'assemblage comportant la réalisation simultanée de deux joints parallèles, effectués en soudure automatique et séparés par une zone non soudée. Ce canal central sert généralement à faire des tests d'étanchéité du joint, sous pression.  2, record 1, French, - contr%C3%B4le%20d%27%C3%A9tanch%C3%A9it%C3%A9%20de%20soudure%20par%20%C3%A9chographie

Record number: 1, Textual support number: 3 OBS

Joint: Zone de liaison entre lés, nappes (ou panneaux).  2, record 1, French, - contr%C3%B4le%20d%27%C3%A9tanch%C3%A9it%C3%A9%20de%20soudure%20par%20%C3%A9chographie

Record number: 1, Textual support number: 4 OBS

Contrôle écographique / Pulse echo technique: Technique de contrôle dans laquelle on utilise les échos obtenus par réflexion de l'onde ultrasonore sur toute solution de continuité.  3, record 1, French, - contr%C3%B4le%20d%27%C3%A9tanch%C3%A9it%C3%A9%20de%20soudure%20par%20%C3%A9chographie

Record 1,  Textual support,  Spanish