Deck foam systems, designed to protect cargo areas on tank vessels built after January 1, 1975, must have a supply of foam-producing material to operate the system at its designed rate of foam production for __________.

Correct Answer: Option B — 20 minutes without recharging

Title 46 CFR requirements for tank vessels built after January 1, 1975, mandate fixed deck foam systems to maintain continuous foam concentrate production at the design application rate for a minimum of 20 minutes without requiring recharge.