Which hazard is associated with nonthreaded couplings?

• A. Hoses can become suddenly and violently uncoupled
• B. Hoses can be deployed from either end
• C. There is always a risk of cross-threading
• D. Fire hose cannot be connected quickly

Answer: (A)

Nonthreaded hose couplings are designed for rapid, field connections using locking lugs rather than threads. The real hazard here is that, under pressure, the coupling can separate suddenly and violently if it isn’t fully engaged, properly seated, or if the lugs or seals are damaged. That abrupt uncoupling can cause a powerful water jet and hose whip, putting firefighters at risk of injury from the sudden release and movement of the hose.

Other statements describe features or issues not primarily hazards with these couplings: deploying from either end is a design benefit, cross-threading relates to threaded connections, and nonthreaded couplings are meant to connect quickly rather than hinder rapid deployment.