Cylinders should be stored in a ventilated room or outdoors with restricted access of unauthorized persons (in accordance with the Rostekhnadzor’s Order No. 116 dated March 25, 2014). Handling of pressure vessels should be carried out by operators who have been trained and authorized to work with such vessels. As you know, there are no absolutely leakproof products. However, parameters and number of leaks are strictly regulated at the stage of product development. If improperly used, there is little risk of leakage through the seat of the closed valve. The actual number of leaks can be not more than 0.7 st.cm³/min, which complies with aviation industry standards. With this value, the pressure drop in a 10 liter tank will be only 3.1 bar per month.