18 400/54 Premium Shielded NMR Magnet System Product Overview
2 Installation and Operation Safety
Hazards Presented by Cryogens
Helium and nitrogen in both their liquid and gaseous forms,
present the following hazards:
• A large quantity of gas released in an area that is not
well ventilated can cause asphyxiation.
• Liquids or cold gases can cause cryogenic burns.
• The filling procedure produces an oxygen- rich liquid,
which is a fire hazard when it drops on a combustible
material.
The extremely low temperature of the liquids and their cold
vapors can cause severe frostbite, or a cryogenic burn. These
low temperatures are mainly a danger during the filling
process, when the fill line and other equipment freezes.
To prevent cryogenic burns, wear safety footwear, protective
gloves, and a face shield. Long- sleeved clothing and long
trousers or pants are also recommended.
During the filling process, atmospheric air condenses on the
fill line or pipes, leaving an oxygen- rich liquid, or even
liquid oxygen. If this drips onto a combustible material, like
oil or grease, it can cause a fire.
For these reasons, note the following recommendations:
• Exclude all sources of ignition from magnet rooms.
• Keep all tools and equipment used for transferring
cryogenic liquids clean and free from oils and grease.
• Exclude all sources of ignition from the magnet room,
which is also designated as a No Smoking zone.
Touching the fill line or any other piece of equipment during a
transfer can freeze the skin or cause it to stick to the surface of
the equipment.
Liquid oxygen can spontaneously ignite upon contact with
oils or greases.
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