What must be done with the foam system after the two-year test?

What must be done with the foam system after the two-year test?

• A. Shut off permanently
• B. Drain and flush with water
• C. Replenish foam concentrate only
• D. Inspect without draining

Answer: (B)

After a two-year test, the foam system should be drained and flushed with clean water. This removes any residual foam concentrate or test solution that might have circulated during the test, along with any contaminants or debris that could have entered the lines. Flushing restores the system to a clean baseline, prevents buildup or hardening of residues, and helps ensure proper foam proportioning and performance when the system is placed back into service. Shutting off permanently, inspecting without draining, or replenishing concentrate alone would leave residues or gaps in readiness, which is why draining and flushing is the correct step.

After a two-year test, the foam system should be drained and flushed with clean water. This removes any residual foam concentrate or test solution that might have circulated during the test, along with any contaminants or debris that could have entered the lines. Flushing restores the system to a clean baseline, prevents buildup or hardening of residues, and helps ensure proper foam proportioning and performance when the system is placed back into service. Shutting off permanently, inspecting without draining, or replenishing concentrate alone would leave residues or gaps in readiness, which is why draining and flushing is the correct step.