Which NFPA section covers drainage and flushing of a foam proportioning tank due to sediment?

Which NFPA section covers drainage and flushing of a foam proportioning tank due to sediment?

• A. Section 11.4.7.4.2
• B. Section 11.2.8.5.2.1
• C. Section 11.1.1.2
• D. Section 4.3.2.4

Answer: (A)

The main idea here is how to perform maintenance on a foam proportioning tank when sediment is present. Foam system reliability depends on clean, properly routed passages and accurate proportioning, and sediment can clog or foul the tank and lines. NFPA 11 designates a specific section for draining the tank and flushing it to remove sediment, ensuring the foam concentrate remains uncontaminated and the proportioning works as intended. That section—11.4.7.4.2—lays out the procedure for draining and flushing the tank when sediment is an issue, making it the best answer. The other sections cover different aspects of foam systems and do not specify this drainage/flushing process.

The main idea here is how to perform maintenance on a foam proportioning tank when sediment is present. Foam system reliability depends on clean, properly routed passages and accurate proportioning, and sediment can clog or foul the tank and lines. NFPA 11 designates a specific section for draining the tank and flushing it to remove sediment, ensuring the foam concentrate remains uncontaminated and the proportioning works as intended. That section—11.4.7.4.2—lays out the procedure for draining and flushing the tank when sediment is an issue, making it the best answer. The other sections cover different aspects of foam systems and do not specify this drainage/flushing process.