Helium tanks can be stored for a long period, but there are some important factors to consider to ensure safety and maintain the integrity of the tank:
1. Storage Duration: Helium itself is an inert gas, which means it doesn't degrade over time. The primary concern with storing helium tanks is ensuring the tank's physical condition is maintained. If the tank is in good condition, it can be stored indefinitely. However, it's best to use the gas within a few years to prevent corrosion or wear on the tank, depending on how well it's maintained.
2. Tank Maintenance: Tanks should be stored in a cool, dry place away from extreme temperatures (not exceeding 125°F or 52°C). Excessive heat or direct sunlight can weaken the tank, so make sure to store it in a shaded, ventilated area.
3. Regulatory Guidelines: Always follow the manufacturer's guidelines and any local safety regulations for storing compressed gas cylinders. These often include keeping the tanks upright, securely fastened, and away from flammable or reactive materials.
4. Inspection: Before using a tank after long-term storage, inspect it for any signs of rust, corrosion, or damage. Many tanks have a stamped expiration date, after which they need to be inspected and possibly re-certified for safety.
As long as the tank is stored properly and the conditions are right, it can last for many years without issue.