14 April 2008 - LTQ5R5 1 LHe Q5R5 New Calibrated probe Reported by Juan CASAS AT – ACR - IN.

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Transcription de la présentation:

14 April LTQ5R5 1 LHe Q5R5 New Calibrated probe Reported by Juan CASAS AT – ACR - IN

14 April LTQ5R5 2 Q5R5 New Level gauge LT831 Calibrated Centered Raised by 20mm (5%) Pressure oscillations reduced Level can be measured with warm by-pass CLOSED! Opening warm-bypass => 10% level reduction Cols capillary & thermal load 30mm (7.5%) underestimation

14 April LTQ5R5 3 LT qualification procedure 1-Mettre en régulation de niveau pendant 24 heures ou plus laimant avec une consigne entre 30 et 50%. 2-Augmenter la consigne de niveau en incréments de 5% jusquà atteindre le débordement. Chaque palier doit être stable pendant au moins 30 minutes 3-Démarrer boil-off avec chauffage 25W 4-Si lors du boil-off le niveau nest pas stable => Laisser décroitre le niveau jusquà obtenir de nouveau la stabilité sur la lecture de niveau => Augmenter le niveau jusquà une consigne 5% inférieure de celle du débordement (point -2-) => Aller à -3- qui est boil-off 25W 5-Attendre augmentation de 0.2K ou plus de la température masse froide (TT831) 6-Remplir au niveau de débordement – 5% 7-Démarrer boil-off naturel 8-Attendre augmentation de 0.2K ou plus de la température masse froide (TT831) 9-Remettre niveau en régulation à une consigne stable

14 April LTQ5R5 4 Natural Boil-off

14 April LTQ5R5 5 25W Boil-off

14 April LTQ5R5 6 Temperature Along Warm by-pass

14 April LTQ5R5 7 Preliminary Conclusions New level support avoid use of thermal by-pass Thermo-acoustic oscillations still present as indicated by too low LT head temperature Above 75-80% level oscillates: LT temperature head much reduced Start of pressure oscillations Level stabilizes after vaporizing and going to ca 40% Maximum level corresponds to piping Vaporized volume still to be calculated but vaporizing times are typical