Hanse VTC Series, Installation, Operation And Maintenance Instructions

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Precautions
Operation
• Liquid nitrogen should never be used except in a well-ventilated area.
• Only containers or fittings (pipes, tongs etc .) that have been designed
specifically for use with cryogenic liquids may be used as non-specialized
equipment may crack or fail.
• Skin contact with either liquid nitrogen or items cooled by liquid nitrogen should
be avoided as serious burns may occur. Care must be taken with gloves, wrist-
bands or bracelets which may trap liquid nitrogen close to the skin.
• Plumbing components need to be brass, copper or stainless steel chosen to
meet the extreme cold and pressure requirements.
You cannot use carbon
steel!
Personal Protective Equipment
The following equipment should be worn when handling or dispensing liquid
nitrogen:
•
Face shield or safety glasses.
•
Dry insulated gloves when handling equipment that has been in contact with the
liquid.
NB there is dispute over the advisability of wearing gloves while handling
liquid nitrogen because there is a possibility that gloves could fill with liquid and
therefore prolong hand contacts which would make burns more severe. If gloves
are worn they should be loose fitting and easily removed.
•
Lab coat or overalls are advisable to minimize skin contact and also trousers
over shoe/boot tops to prevent shoes filling in the event of a spillage.
Avoidance of Oxygen Depletion/ Asphyxiation
• Liquid nitrogen should normally be used only in a well-ventilated area .
• Oxygen Sensors. Oxygen sensors and alarms should be in place in any area
where liquid nitrogen is to be used. Also recommended with the oxygen sensor
is an interlock system to shut down safety valves if oxygen level drops below
safe levels.
• 19.5% Oxygen is set by OSHA
Training
• New users of liquid nitrogen should receive instruction in its use from trained
members of the sta
ff and should know the use of:
o Oxygen alarms
o Proper ventilation
o Emergency ventilation
o Evacuation plan
o LN2 supply shuto ff procedure.
Authorization and Copyright of this document is
controlled by Hanse Environmental Inc.
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