🔥 SELF-CONTAINED BREATHING APPARATUS (SCBA) • A Self-Contained Breathing Apparatus permits firefighters to operate safely in atmospheres that cannot support life, including: – Immediately Dangerous to Life and Health (IDLH) conditions – Oxygen-deficient atmospheres (below 19.5% O₂) – Smoke-filled, toxic, superheated, or contaminated air • SCBA is also used when the air is unsafe, irritating, or uncomfortable (heat, smoke, particulates, off-gassing chemicals). ⸻ Composition of SCBA Air Compresse

🟥SUBJECT: SCBA CYLINDER REFILL FROM WARM TO COLD I received a QUESTION & it is a good one: Do I need to refill if the vessel is from a warm area, then going to a cold area? Because my SCBA pressure gauge dropped to 190bars (5%) from 200bars? What you are observing is normal pressure drop due to temperature change. SCBA cylinders follow Gay-Lussac's Law to be more precise: When temperature decreases → internal pressure decreases. When temperature increases → internal pressure increases. So, if y