When dealing with oxygen cylinders, what is an important practice?

The importance of avoiding the use of oil or grease around oxygen cylinders stems from the properties of oxygen and the risks associated with its high reactivity. Oxygen supports combustion and can greatly enhance the flammability of materials. When oil or grease comes into contact with high-pressure oxygen, it can create a dangerous situation, as these substances can ignite and lead to explosions or fire. Therefore, keeping oil and grease away from oxygen cylinders is critical for ensuring safety in an environment where high concentrations of oxygen are present.

In addition to this practice, safe handling and storage of oxygen cylinders should include ensuring that they are kept in an appropriate environment, such as well-ventilated and dry areas, rather than wet or high-pressure settings. Proper closure of cylinders is also important to prevent leaks, but it doesn't address the specific chemical hazard presented by oil in oxygen environments. Thus, avoiding oil or grease is the most critical safety practice when working with oxygen cylinders.