What is an important safe-handling practice for emergency oxygen systems?

An important safe-handling practice for emergency oxygen systems is to avoid using oil, grease, or adhesive tape on or near the system. This is crucial because oxygen is a highly reactive gas, and the presence of oils or greases can create a fire hazard. In an oxygen-rich environment, even small amounts of these substances can ignite and cause a severe fire or explosion. Therefore, ensuring that the area and equipment are free from these materials is vital for safety when dealing with oxygen systems.

The other options may not address the core safety concern related to the highly reactive nature of oxygen and the potential for hazardous situations. For instance, recycling the cylinder when it can no longer be refilled pertains more to disposal and does not directly relate to safe handling during use. Removing the cylinder from its case may compromise both safety and integrity during operations. Tightening the t-handle valve with a wrench could lead to over-tightening or damaging the valve, which is not necessary if proper procedures for securing the valve are followed. Consequently, the emphasis on avoiding flammable materials near the oxygen system is a fundamental principle of safe handling.