How far shall people not involved in LOX servicing be from the area?

• A. 10 feet
• B. 20 foot radius
• C. 30 feet
• D. 50 feet radius

Answer: (B)

A safe exclusion zone around LOX servicing is essential because liquid oxygen creates hazards that extend beyond the immediate equipment. LOX is an extremely strong oxidizer and is cryogenic, so a spill, splash, or vent can cause severe cold burns and can dramatically increase the likelihood and intensity of ignition if a flame or spark is present. Oxygen from LOX can also accumulate in the surrounding air, especially in low spots, creating an oxygen-enriched environment that makes materials more prone to burning. By establishing a defined circular boundary around the LOX area, you create a buffer that helps prevent bystanders from exposure to splashes, frost, vapor plumes, or any incidental leaks, and it keeps ignition sources out of reach. This boundary represents a practical compromise that protects workers without unduly hindering operations; too small a perimeter risks exposure, while too large a one can be unnecessarily restrictive.