Following on last weeks log https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=72444

As planned, two technicians from Macdonald Miller visited site today to continue investigation of the runaway and failure of chilled water system 1 at EY.

A failing flow switch was discovered. Further investigation showed that not only had the wiring for the flow switch been chewed away exposing/severing the wiring (bunny, mice etc.) but that a CBUS line in the chillers harness had also been met with curious teeth. Both damaged items have a ~20 week lead time but are on order. 

Purely as a contingency plan (given part lead times), we cross referenced flow switch part numbers on the corner station chillers. In the event of a chilled water apocalypse, we are confident that flow switches from either of two non-running corner station chillers would be suitable fill-ins to keep the end stations functional.

Because we incurred mild glycol loss during todays work at EY, Chris Soike brought a barrel of glycol up to EY. We monitored pressures at the VEA closely and replenished losses at the makeup tank. The makeup tank is presently sitting ~75% capacity. Supply and return pressures look good. 

The system continues to be supplied and satisfied by chiller 2 and chilled water pump 2.

C. Soike B. Haithcox A. Tarralbo T. Guidry