〈1207.2〉 Package Integrity Leak Test Technologies

2021 ◽  
Keyword(s):  
Leak Test

Selective Corrosion of brazed joint between BNi-2 filler metal and stainless steel 316

1996 ◽  
Vol 54 ◽  
pp. 218-219
Author(s):  
H. S. Kim ◽  
R. U. Lee
Keyword(s):  
Stainless Steel ◽  
Filler Metal ◽  
Surface Preparation ◽  
Optical Microscope ◽  
Heating Element ◽  
Incomplete Fusion ◽  
Atmospheric Conditions ◽  
Leak Test ◽  
High Temperature Side ◽  
Inconel 600

A heating element/electrical conduit assembly used in the Orbiter Maneuvering System failed a leak test during a routine refurbishment inspection. The conduit, approximately 100 mm in length and 12 mm in diameter, was fabricated from two tubes and braze-joined with a sleeve. The tube on the high temperature side (heating element side) and the sleeve were made of Inconel 600 and the other tube was stainless steel (SS) 316. For the filler metal, a Ni-Cr-B brazing alloy per AWS BNi-2, was used. A Helium leak test spotted the leak located at the joint between the sleeve and SS 316 tubing. This joint was dissected, mounted in a plastic mold, polished, and examined with an optical microscope. Debonding of the brazed surfaces was noticed, more pronounced toward the sleeve end which was exposed to uncontrolled atmospheric conditions intermittently. Initially, lack of wetting was suspected, presumably caused by inadequate surface preparation or incomplete fusion of the filler metal. However, this postulation was later discarded based upon the following observations: (1) The angle of wetting between the fillet and tube was small, an indication of adequate wetting, (2) the fillet did not exhibit a globular microstructure which would be an indication of insufficient melting of the filler metal, and (3) debonding was intermittent toward the midsection of the sleeve.

Cuff-leak test combined with interventional bronchoscopy benefits early extubation for patients who received tarp surgery

2016 ◽  
Vol 26 (3) ◽  
pp. 840-846
Author(s):  
Jian-qiang Dai ◽  
Wei-Feng Tu ◽  
Qing-shui Yin ◽  
Hong Xia ◽  
Guo-dong Zheng ◽  
...  
Keyword(s):  
Early Extubation ◽  
Leak Test ◽  
Interventional Bronchoscopy ◽  
Cuff Leak

scholarly journals The endotracheal tube air leak test does not predict extubation outcome in critically ill pediatric patients

2008 ◽  
Vol 9 (5) ◽  
pp. 490-496 ◽  
Author(s):  
Angela T. Wratney ◽  
Daniel Kelly Benjamin ◽  
Anthony D. Slonim ◽  
James He ◽  
Donna S. Hamel ◽  
...  
Keyword(s):  
Endotracheal Tube ◽  
Critically Ill ◽  
Pediatric Patients ◽  
Air Leak ◽  
Leak Test ◽  
Air Leak Test ◽  
Extubation Outcome

Detection of a Tracheal Obstruction Caused by a Retrosternal Goiter by the Use of a Cuff Leak Test

2000 ◽  
Vol 90 (4) ◽  
pp. 1002 ◽  
Author(s):  
Torsten Meier ◽  
Thorsten Leibecke ◽  
Jan Schumacher ◽  
Klaus Berger ◽  
Karl F. Klotz
Keyword(s):  
Leak Test ◽  
Tracheal Obstruction ◽  
Retrosternal Goiter ◽  
Cuff Leak

scholarly journals Comparison between Cuff Leak Test and Ultra Sound Assessment of Laryngeal Edema in Predicting Successful Extubation in Mechanically Ventilated Patients

2020 ◽  
pp. 43-51
Author(s):  
Manar Mohammed Ismail ◽  
Sohair Mostafa Soliman ◽  
Hoda Alsaid Ahmed Ezz ◽  
Amr Arafa Elbadry
Keyword(s):  
Endotracheal Intubation ◽  
Ultra Sound ◽  
Laryngeal Edema ◽  
Leak Test ◽  
Vocal Cords ◽  
Mechanically Ventilated ◽  
Mechanically Ventilated Patients ◽  
Cuff Leak ◽  
Ventilated Patients ◽  
Successful Extubation

Objects: Endotracheal intubation commonly leads to local complications, including mechanical lesions, such as friction and compressions between the tube and the anatomic structures of the larynx leading to laryngeal edemamanifested as ‘‘stridor’’ after extubation. There is no standard method to predict patients at risk of post-extubation stridor. This study was conducted to compare between cuff leak test and ultra sound in predicting successful extubation in mechanically ventilated patients. Patients and Methods: We included a total of 83 mechanically ventilated patients with endotracheal intubation > 24 hours. They were divided according to the outcome after extubation into 72 patients who didn’t develop laryngeal edema and 11 patients who developed laryngeal edema. The patients were extubated when they fulfilled the criteria of extubation and become negative to cuff leak test. All patients underwent both cuff leak test (CLT) and ultra-sound to assess air column width difference (ACWD) after intubation and before extubation. Results: All patients were matched as regard demographic data. There was a significant increase in the duration of mechanical ventilation in the LE group. No significant difference was detected between the two groups regarding CLT and ACWD after intubation. However, cases with laryngeal edema had significantly lower CLT and ACWD before extubation. Using a cut off value of 1.52 mm, ACWD had sensitivity and specificity of 90.9 and 91.7% respectively to predict laryngeal edema after extubation. Conclusions: Laryngeal Ultrasonography could be a useful, reliable, non-invasive method in the evaluation of vocal cords, laryngeal morphology and airflow passing through the vocal cords or subglottic area in intubated patients in comparison with cuff leak test.

scholarly journals Predictors of post-extubation stridor in patients on mechanical ventilation: a prospective observational study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aiko Tanaka ◽  
Akinori Uchiyama ◽  
Yu Horiguchi ◽  
Ryota Higeno ◽  
Ryota Sakaguchi ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Observational Study ◽  
Critically Ill ◽  
Critically Ill Patients ◽  
Prospective Observational Study ◽  
Spontaneous Breathing Trial ◽  
Leak Test ◽  
Endotracheal Suctioning ◽  
Cuff Leak ◽  
The Impact

AbstractThe cuff leak test (CLT) has been widely accepted as a simple and noninvasive method for predicting post-extubation stridor (PES). However, its accuracy and clinical impact remain uncertain. We aimed to evaluate the reliability of CLT and to assess the impact of pre-extubation variables on the incidence of PES. A prospective observational study was performed on adult critically ill patients who required mechanical ventilation for more than 24 h. Patients were extubated after the successful spontaneous breathing trial, and CLT was conducted before extubation. Of the 191 patients studied, 26 (13.6%) were deemed positive through CLT. PES developed in 19 patients (9.9%) and resulted in a higher reintubation rate (8.1% vs. 52.6%, p < 0.001) and longer intensive care unit stay (8 [4.5–14] vs. 12 [8–30.5] days, p = 0.01) than patients without PES. The incidence of PES and post-extubation outcomes were similar in patients with both positive and negative CLT results. Compared with patients without PES, patients with PES had longer durations of endotracheal intubation and required endotracheal suctioning more frequently during the 24-h period prior to extubation. After adjusting for confounding factors, frequent endotracheal suctioning more than 15 times per day was associated with an adjusted odds ratio of 2.97 (95% confidence interval, 1.01–8.77) for PES. In conclusion, frequent endotracheal suctioning before extubation was a significant PES predictor in critically ill patients. Further investigations of its impact on the incidence of PES and patient outcomes are warranted.

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