The minimum temperature for a water storage tank shall not be less than how many degrees Fahrenheit?

The minimum temperature for a water storage tank shall not be less than how many degrees Fahrenheit?

• A. 32
• B. 42
• C. 50
• D. 60

Answer: (B)

The main idea here is frost protection for water stored in a tank used for fire protection. Keeping the stored water above the freezing point ensures the tank and the system won’t freeze in cold weather, which could compromise available pressure and reliability when a system is called upon. Choosing not to drop the temperature below 42°F provides a safe margin above freezing to accommodate heat loss, sensor and mixing variations, and normal operation in varying outdoor conditions. If you let the temperature dip to freezing (32°F), there’s a real risk of ice and ice-related issues in cold climates. Warmer temperatures, like 50°F or 60°F, wouldn’t provide any extra benefit for a cold-water storage tank and could unnecessarily promote microbial growth and increase energy use or corrosion concerns. Thus, the minimum temperature not to exceed is 42°F, ensuring the water stays cold enough to minimize risk but above freezing to prevent freezing incidents.

The main idea here is frost protection for water stored in a tank used for fire protection. Keeping the stored water above the freezing point ensures the tank and the system won’t freeze in cold weather, which could compromise available pressure and reliability when a system is called upon.

Choosing not to drop the temperature below 42°F provides a safe margin above freezing to accommodate heat loss, sensor and mixing variations, and normal operation in varying outdoor conditions. If you let the temperature dip to freezing (32°F), there’s a real risk of ice and ice-related issues in cold climates. Warmer temperatures, like 50°F or 60°F, wouldn’t provide any extra benefit for a cold-water storage tank and could unnecessarily promote microbial growth and increase energy use or corrosion concerns.

Thus, the minimum temperature not to exceed is 42°F, ensuring the water stays cold enough to minimize risk but above freezing to prevent freezing incidents.