[Sneap] SF6 information

[rlefferts at notes.cc.sunysb.edu]

Hi Bob,

We run "pure" SF6 in FN-8 but, like Chris, do not have a dedicated exhaust 
system.

After review with the NYS Dept. of Labor a few years back, our FN and the 
trenches in our accelerator vault are designated "Permit Required Confined 
Spaces". We are issued an annual permit by our Uninversity EH&S after they 
check our procedures (ex. double block and bleed), training records, 
posting and safety equipment.  We must log entries, carry O2 Deficiency 
monitors (Halogen detectors can sub.) and designate a "watcher" for every 
entry, but don't need to have EH&S check us each time.   We are not 
required to wear harnesses.

We learned the obvious in Summer 1984 when a blown seal cost us our entire 
SF6 inventory.  Our trenches have sufficient volume to hold all the SF6 
and there is NO Oxygen Deficiency Hazard anywhere else.  We run our air 
handling system in "once through" when we are transferring gas to or from 
the accel vessel, but this is mostly just habit.  SF6 ... sinks. Mixing is 
slow, so one must exhaust any lost SF6 from a low point.

Good luck!

Rich Lefferts

Richard S. Lefferts
Nuclear Structure Laboratory
Department of Physics and Astronomy
Stony Brook University
Stony Brook, New York 11794-3800
Desk, Voice-mail: 631-632-8169
Lab:              631-632-8153
Fax:              631-632-8573 



"Krause, Bob" <krause at phys.ksu.edu> 
Sent by: sneap-bounces at tunl.duke.edu
05/22/2008 12:50 PM
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Symposium of Northeastern Accelerator Personnel <sneap at tunl.duke.edu>


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Subject
[Sneap] SF6 information






The host for the 2008 SNEAP annual meeting is the University of Michigan 
at Ann Arbor.  The meeting dates are: October: 12 - 17, 2008.
The meeting web link is: 
http://www-ners.engin.umich.edu/research/Mibl/Sneap/2008.htm

Dear Sneapers,
 
Here at Kansas State we have a question to all laboratories concerning the
 insulating gas used in your accelerators.  Specifically EN’s and up where 
large
 amounts of SF6 and Nitrogen are involved.  Smaller machine’s please reply 
as well.
 Do any of you have any kind of emergency exhaust system to ventilate your 
laboratory 
to the outside if there was a catastrophic leak in the tank or seal? 
 
Thanks,
 
Bob Krause
Kansas State University
James R. Macdonald Laboratory
 
 
 
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