Page History

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• Chilled water issues
  • per Luke, preliminary data shows the issues with chilled water is directly related to the XDP refrigerant temperature set point changes that was made recently not clogged stariners
  • Also early in the season, changes to the chilled water differential  pressure set point change (dropped from 30 to 25) may have contributed.
  • The above 2 cause the XDP valve to operate at higher opening to maintain refrigerant temperature during transition.
  • Operating at higher valve popping openping is good not bad thing
  • But the nuisance alarms have be addressed 
• Tower water treatment controller is up and running, it required to stop tower operation for 2 days.
  • All water treatment now under control
  • Reports of Weekly and monthly water treatment will be be generated. 
  • This could be the last week for tower operation for the season.

NPCF Week 14 (4/1-4/7)

• Tower switched multiple time over the weekend, received complaints from Cray team.
• Assisted  Blue Waters senior design team on their project.
• At the request of Cray personnels investigated  causes of chilled water spikes and low flows (strainers issues) 
• Switched all XDPs chilled water strainers to standby ones and F&S are cleaning all the ones that  were in service.

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