The nitrogen cylinder's valve should only be opened when a regulator is installed for safety. This ensures controlled gas flow and helps prevent accidents. Therefore, the best practice is that the valve should not be opened if the cap is still on or without a regulator installed.
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Safety practices for handling nitrogen cylinders include ensuring a regulator is installed before opening the valve. The valve should not be opened when the cap is on, and ambient temperature, while important, is not the most critical factor. Proper safety measures reduce the risk of accidents and maintain equipment integrity. ;