Operation; Removal Of Liquid Discharge Device - Thermo Scientific 803 Manual De Funcionamiento Y Lista De Piezas

Section 3

Operation

Removal of Liquid
Discharge Device
3-4 Cryogenic Transfer Vessels
Operation
Perform the following steps to withdraw liquid from the vessel using the
liquid discharge device:
1. Turn the discharge valve fully open and then turn back the valve a half
turn. Do not leave the valve in the fully open position.
2. Close the discharge valve to end liquid withdrawal.
Warning Cryogenic liquids are extremely cold and can cause sever burns
similar to frostbite. See CGA Bulletin No.P-12 Safe Handling of
Cryogenic Liquids. (This bulletin may be ordered from Compressed Gas
Ass'n., 4221 Walney Road, 5th floor, Chantilly, VA 20151.)
Warning Nitrogen vapors in air may dilute the concentration of oxygen
necessary to support or sustain life. Exposure to such oxygen deficient
atmosphere can lead to unconsciousness and serious injury ,including
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death.
Warning Modifying safety valves on discharge devices causes potentially
hazardous conditions.
Perform the following steps to remove the liquid discharge device from the
vessel:
1. Open the vent valve to remove all pressure.
2. Verify that the pressure gauge reads 0.
Warning Vessel must be completely vented before removing the discharge
device. Any attempt to remove the discharge device before the vessel is
completely vented may result in serious personal injury.
3. Release wingnut.
4. Rock discharge device from side to side to free stopper.
5. Pull discharge device from vessel.
6. When stopper has passed rim of vessel, unclip safety cable.
7. Store liquid discharge device in a clean and dry area.
8. Cover vessel.
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