What is the minimum number of people for LOX servicing?

• A. 1 person
• B. 2 people
• C. 3 people
• D. 4 people

Answer: (B)

Handling liquid oxygen requires a buddy system. LOX is extremely cold and poses several hazards: the liquid can cause severe cold burns, its vapor can displace air, and its high oxygen content raises the risk of ignition if any hydrocarbon or grease is present. Having two people ensures that one person operates and connects/disconnects the transfer equipment while the other monitors the process, checks for leaks or frost buildup, and can take immediate action if something goes wrong. The second person can also verify that PPE is used correctly and that the area is free of oil, grease, or other ignition sources.

With only one person, there’s no one to assist, observe for hazards, or shut off flow promptly in an emergency. This is why the minimum staffing for LOX servicing is two people.