[Utility Outage] Completed HVAC Outage - 06/29/2016 08:00

[Carroll W. Jones]

The following HVAC Outage has been Completed:

Outage:      Replace Test Lab Cooling Tower Bypass Valve Assembly Actuator
Proposed By: Carroll W. Jones
Start Time:  06/29/2016 08:00
End Time:    06/29/2016 15:00

Description/Impacts:
The new actuator has been installed and is functional.  There is an interference problem between the actuator linkage and actuator housing resulting from the actuator having to be rotated to avoid modification of a major pipe support.  There is a proposed plan to modify the linkage which should be able to be implemented without impacting cooling tower operations.

For additional information or clarification, please contact Carroll Jones at 757-876-1778.

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Please note actual cooling tower pump downtime should occur near mid morning and equipment impacts should last for approximately 20 to 30 minutes.
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Remove existing Test Lab Cooling Tower electronic bypass actuator and install the replacement pneumatic actuator.   The bypass valve assembly linkage must also be replaced due to the weight of the replacement pneumatic actuator which will require a brief shutdown Test Lab Cooling Tower circulation pumps to prevent the valves from closing violently.   Linkage arm attached to butterfly valve stem in piping to upper tower basins shall be manually secured in open position to enable existing actuator and remaining linkage assembly to be removed and the new linkage assembly installed minus the linkage arm on the butterfly valve in piping to upper tower basins.  Once ready to replace the remaining valve linkage arm, Central Chiller System CUP Building chillers and Test Lab Cooling Tower pumps will be switched off briefly (approximately 20 to 30 minutes or less if possible) while the existing linkage arm is removed and the replacement arm installed.  Central Chiller System circulatio
 n pumps will remain operational to transfer heat into the chilled water system and slow space temperature rise in the F-Wing Data Center, cleanrooms, and other areas and equipment cooled.  Test Lab Cooling Tower pumps and CUP chillers will be restarted as soon as the linkage assembly is intact and secured in the full open to tower upper basins position.  Other systems cooled by the Test Lab Cooling Tower System will be impacted such as the TLA Acid Chiller, TLA Process Cooling Water System, Test Lab LCW System, TED LCW System, and Accelerator Chilled Water Loop.

For additional information or clarification, please contact Carroll Jones at 757-876-1778


Impacted Areas:
	Bldg 01: North LINAC
	Bldg 02: South LINAC
	Bldg 21: North Extractor Service
	Bldg 38: South Access
	Bldg 39: East Arc Service
	Bldg 40: West Arc Service
	Bldg 45: West Arc Service
	Bldg 49: East Arc Service
	Bldg 50: East Arc Service
	Bldg 53: Injector Service
	Bldg 56: West Arc Service
	Bldg 60: Chiller Utility Plant
	Bldg 63: East Arc Service
	Bldg 67: North Access
	Bldg 68: West Arc Service
	Bldg 82: South Extractor Service
	Bldg 55: TED Building
	Bldg 58: Test Lab
	Bldg 90: Experimental Equipment Lab

For more details, visit the webpage listed below:
https://cc.jlab.org/cgi-bin/infrastructure/Outage/OutageView?ident=120