Ensure a serviceable 125/150 lb wheeled PKP fire extinguisher or equivalent is placed within ___ of the LOX servicing operation.

• A. 10 ft
• B. 25 ft
• C. 50 ft
• D. 100 ft

Answer: (C)

During LOX servicing, the environment is highly oxygen-rich, which dramatically raises the risk that a small ignition could flare into a fire. Having a serviceable 125/150 lb wheeled PKP extinguisher or an equivalent readily available allows a rapid initial response to any fire near the LOX system, before it can spread.

The specified distance strikes a practical balance: close enough for quick deployment, yet far enough to keep the extinguisher out of the way of hoses, carts, and other servicing equipment. Fifty feet is a standard safety margin that ensures you can reach and operate the extinguisher quickly without it obstructing operations or being exposed to cryogenic hazards. If the extinguisher were much closer, it could interfere with servicing; if it were much farther away, response time could be too slow in an oxygen-enriched environment.

A heavy wheeled PKP extinguisher is well suited for this scenario because it provides substantial discharge capability for potential Class B or C fires that might occur around LOX systems, and it remains accessible for rapid use during the operation.