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Reports until 11:12, Thursday 29 August 2019
H1 SEI
hugh.radkins@LIGO.ORG - posted 11:12, Thursday 29 August 2019 (51608)
H1 EndX HEPI Pump Replacement Status

Going well. Replacement pump is in and recirculating fluid locally at the Pump Station.  It sounds better, I'll try to show before and after spectra.  In an hour or less, we'll switch and circulate throughout the VEA plumbing by-passing the Actuators, again, for about an hour or so before we attempt to run the system normally.

All the steps seemed to go as we expected and planned and we managed to not make too big a mess.  The worst was when we thought the manifold was fairly empty and the first resistor cap was pulled.  There was a good bit of fluid still but we had a pan to catch most of it.

We pulled that cap to look for debris which is one place where LLO saw a lot of particulate when they had a pump bearing failure, see page 5 of T1500601.  This was hopefully the least messy place to look and close to first in the chain; we found no evidence of particulate and it looked very clean--see attached.

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