Post on 25-Dec-2015
M. Gilchriese
Glued Fittings
October 5, 2005
M. Gilchriese2
Samples and Prep
• Three samples using Hysol 9396• Seven samples using Hysol 9394• Surface prep tubes
– Sandpaper(600) with alcohol– Wash with alcohol– Wash with acetone
• Surface prep fitting– Brass wire brush with alcohol– Wash with alcohol– Wash with acetone
• Irradiate to about 25 MRad (exact value TBD)• He leak -> P to 15.5 bar -> He leak -> irradiate -> P to 15.5 bar
-> He leak
M. Gilchriese3
Samples After Irradiation• Note that epoxy turns blue-like color. No evidence of epoxy running.
M. Gilchriese4
Before/After Comparison
• Small weight gain
• Note that did not try to control electrical contact between fittings and pipe. Resistance after. Did not measure before.
• Change in leak rate not significant. Small change from setup on different days.
SampleWeight Before
Weight After(10/4) After-Before
Resistance After
Leak Before Leak After
96A 1.9813 1.9838 0.0025 Open 1.10E-09 1.30E-0996B 1.9788 1.982 0.0032 Open 1.10E-09 1.30E-0996C 1.97 1.9735 0.0035 0 1.20E-09 1.30E-0994A 1.8542 1.8579 0.0037 Open 1.10E-09 1.40E-0994B 2.0056 2.0073 0.0017 Open 1.10E-09 1.20E-0994C 1.8837 1.8855 0.0018 0 1.10E-09 1.30E-0994D 1.7724 1.7748 0.0024 Open 1.20E-09 1.60E-0994E 1.7756 1.7778 0.0022 0 1.10E-09 1.50E-0994F 1.7809 1.7833 0.0024 0 1.00E-09 1.10E-0994G 1.9228 1.9256 0.0028 Open 1.30E-09 1.50E-09
M. Gilchriese5
9396 Pictures
M. Gilchriese6
9394 Pictures
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Cross Section 9396
9396
Tube in aboutCorrect Longitudinalposition
M. Gilchriese8
Cross Section 9394
9394
Tube notFullyInserted
Big void
Glue film
M. Gilchriese9
First Conclusion
• Promising but need more testing
• Thermal cycling about to start
• Will do pressure cycling also
• Mechanical strength tests to follow, need to define protocol
• Need more tests in C3F8 not irradiated and irradiated to understand penetration into epoxy. Bulk epoxy samples
• Assuming all is OK, better control of glue application and assembly. These samples were done in a hurry.