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Reports until 11:19, Monday 25 May 2015
LHO FMCS
john.worden@LIGO.ORG - posted 11:19, Monday 25 May 2015 - last comment - 16:39, Monday 25 May 2015(18601)
Water system

Kiwamu and Dan reported that there is no potable water in the OSB. It looks like the RO system went into fault on May 22 around 5:30pm and this morning the potable water tank went dry.

Kiwamu visited the water room for me and reset the RO system so it now appears to be operating normally and making water. However, the building is not yet pressurized.

I suspect the Naimco water skid will need to be reset.

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john.worden@LIGO.ORG - 13:21, Monday 25 May 2015 (18602)

Water is flowing somewhere..After the RO unit was reset the tank level started to climb but when the building was pressurized the level began to fall at an unusual rate.

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john.worden@LIGO.ORG - 16:39, Monday 25 May 2015 (18606)

We think the water system is back to normal.

Gerardo happened to be at the site when I got there so we visited the water room together to look into the problems.

We found that the water pumps were very hot and after breaking some fittings we found steam and hot water. After bleeding the system and cooling it down we restarted it and were able to immediatly build pressure.

The cause was likely a pressure switch which did not get reset during the initial startup. We'll investigate next week.

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