What must floor drains have in clean agent protected enclosures?

What must floor drains have in clean agent protected enclosures?

• A. A continuous water column
• B. Traps and Water in them at all times
• C. Sealed drains
• D. Perforated covers

Answer: (B)

Floor drains in clean agent protected enclosures must have traps that are kept filled with water at all times. The water in the trap creates a barrier (a water seal) that prevents the clean agent from migrating into the drainage system or outside of the enclosure during discharge or venting. If the trap loses its water, the seal is lost and the agent can escape through the drain, undermining containment. Other drain concepts, like a continuous flow of water, a sealed drain, or perforated covers, do not provide the reliable, water-sealed barrier needed to keep the agent contained within the enclosure.

Floor drains in clean agent protected enclosures must have traps that are kept filled with water at all times. The water in the trap creates a barrier (a water seal) that prevents the clean agent from migrating into the drainage system or outside of the enclosure during discharge or venting. If the trap loses its water, the seal is lost and the agent can escape through the drain, undermining containment. Other drain concepts, like a continuous flow of water, a sealed drain, or perforated covers, do not provide the reliable, water-sealed barrier needed to keep the agent contained within the enclosure.