Technically, no. Nitrogen is a common gas found in nature. However, when stored under pressure in sealed containers or in its liquid state there are two primary dangers. The first is asphyxiation. Because of its rapid expansion, it can quickly displace oxygen in an enclosed area. The second is the result of its cold temperatures.
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Open vent valve completely, releasing any pressure built up inside the cylinder. Remove brass plug located on the top center of the cylinder. Insert funnel into hole. Pour liquid nitrogen into cylinder until level gauge reads 7/8 full or liquid nitrogen begins spitting from the vent valve. Reinsert brass plug and tighten.
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