Water storage tanks should have how many gallons?

• A. 4360 + or - 25 gallons
• B. 4360 gallons
• C. 4000 gallons
• D. 4500 gallons

Answer: (A)

Water storage tanks are specified by a nominal capacity with an allowable tolerance. In this context, the standard is a nominal 4360 gallons, allowed to vary by plus or minus 25 gallons. This means the tank is considered acceptable if it measures between 4335 and 4385 gallons. The tolerance accounts for small differences in manufacturing, installation, and measurement accuracy, while the nominal capacity ensures there is enough water for crew needs and firefighting, without overbuilding the system. The exact 4360 gallons without any tolerance or other numbers would be too rigid or outside the tested standard, so the 4360 plus or minus 25 gallons is the correct specification.