What hazard is associated with the accumulation of LPG or CNG gas in tight spaces?

The accumulation of LPG (Liquefied Petroleum Gas) or CNG (Compressed Natural Gas) in tight spaces poses a significant risk of asphyxiation. Both gases can displace oxygen in the air, leading to a reduction in the amount of breathable air available. In confined or poorly ventilated areas, even a small concentration of these gases can create a dangerously low oxygen environment, which can result in unconsciousness or even death if individuals are exposed without proper ventilation or safety measures.

Understanding the nature of these gases is crucial; they are both heavier than air when in liquid form, causing them to accumulate in low-lying areas, thus increasing the risk of asphyxiation. This is why safety standards emphasize proper ventilation and monitoring in areas where LPG or CNG are used or stored, especially in confined spaces.