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Vacuum Safety

Vacuum Safety. July 26 , 2011. 1. Safe Use and Operation of Vacuum Lines, UCLA Chemistry and Biochemistry 2. http ://www.monash.edu.au/ohs/topics/hazard-alerts/vacuum-pumps-cold-traps.html. Starting Up. Ensure that the vacuum trap is dry and clean. Lower the trap into the empty Dewar.

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Vacuum Safety

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  1. Vacuum Safety July 26, 2011 1. Safe Use and Operation of Vacuum Lines, UCLA Chemistry and Biochemistry 2. http://www.monash.edu.au/ohs/topics/hazard-alerts/vacuum-pumps-cold-traps.html

  2. Starting Up • Ensure that the vacuum trap is dry and clean. • Lower the trap into the empty Dewar. • Ensure that all valves are closed, and start (or open line to) the vacuum pump. • Fill the Dewar with liquid nitrogen and wrap the top with a towel.

  3. Shutting Down • Make sure all vessels attached to the line are under nitrogen. • Carefully lower the Dewar and turn the pump off. • Vent the system to air and wait for any frozen liquid to thaw. • Dispose of any solvent.

  4. If liquid O2 is present • Notify all laboratory personnel. • Wear a face shield, fastened lab coat and thick rubber gloves. • Lower the Dewar and vent the system. • Carefully place a safety shield around the trap. Do not attempt to remove. • Leave cold trap to stand overnight vented to air and then carefully re-inspect to check that all suspect material has evaporated.

  5. Final Words • NEVER let the trap sit in liquid nitrogen for more than a minute without having the vacuum pump turned on. • Under NOcircumstances should the system be left open to air with the Dewar containing liquid nitrogen in place.

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