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Reports until 14:26, Thursday 20 February 2020
LHO VE
chandra.romel@LIGO.ORG - posted 14:26, Thursday 20 February 2020 (55200)
CP1 Dewar fill line repair and plans for overdue skid maintenance

A leaky braze joint was repaired under warranty on CP1 Dewar fill line by brazing over the pin hole leak (new field braze joint at components added last summer) . The joints at MY were inspected by vendor and deemed OK. The others looked fine to me with visual inspection.

We are overdue for skid maintenance listed below. As far as I know all of these components are original and should be replaced every five years. I plan to collect quotes and have this work contracted after O3 ends.


1. Replace Dewar pressure relief valve + burst disk, install a diverter valve, and add redundant pressure relief and burst disk (the new standard); this will require depressurizing the Dewar and thus may take a couple of hours per Dewar.

2. Replace all pressure relief valves in fill line.

3. Replace male fill line connector that has been deformed over the years from truckers pounding on it. The new standard is SS piping at connector with a Cu transition.
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