[Esr-users] [New Logentry] Torus ramp down

Thu May 3 18:08:24 EDT 2018

In advance of the shutdown of ESR, dewar level has intentionally been lowered to manage helium inventory.  The level was lowered below the flow shutoff setpoint of the Hall B supply valve without also decreasing said setpoint.  This caused a the drop in pressure at CPI8511 which caused the torus to ramp down. 

The setpoint has been decreased and Hall B's supply valve has fully opened.

The dewar is not normally set to run this low, and I forgot about this safety function when lowering dewar level (which is intended to activate during hall recovery from an ESR trip).

Chris Perry
Mechanical Engineer
Cryogenics Group
Thomas Jefferson National Accelerator Facility
12000 Jefferson Ave, Newport News, VA 23606
cperry at jlab.org
(757) 269-6157

----- Original Message -----
From: omcortes at jlab.org
To: rfair at jlab.org, ghoshal at jlab.org, "Dave Kashy" <kashy at jlab.org>, esr-users at jlab.org
Sent: Thursday, May 3, 2018 5:50:01 PM
Subject: [Esr-users] [New Logentry] Torus ramp down

Torus ramp down 

Lognumber 3571479 . Submitted by omcortes on Thu, 05/03/2018 - 17:47. Logbooks: 	HBLOG HBTORUS 

Torus ramp down. 4 alarms. 
Super critical cct . PT 8111 

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