 Reference to Liquid-Level Limit Control Requirements for Atmospheric Tanks:

According to The International Fire Code (IFC 2021), Section 5704.2.7.5, atmospheric tanks containing hazardous materials must be equipped with a liquid-level limit control if their capacity exceeds 500 gallons.

This requirement ensures that overfilling is prevented, reducing the risk of hazardous spills, leaks, and fire hazards.

 Purpose of Liquid-Level Limit Controls:

These controls automatically shut off or alert operators when the liquid level reaches a predetermined limit.

They prevent tank overfill and reduce the risk of hazardous material release, which can cause fires, explosions, or environmental contamination.

 Clarification of Incorrect Answer Choices:

A. 55 gallons → Incorrect

55-gallon drums are not subject to the same overfill protection requirements as large atmospheric tanks.

B. 100 gallons → Incorrect

Too low based on IFC 5704.2.7.5, which sets the requirement at 500 gallons.

C. 250 gallons → Incorrect

Some local regulations may require monitoring for tanks of this size, but IFC specifies 500 gallons as the mandatory threshold.

 Conclusion:

The correct and verified answer is D (500 gallons) based on IFC 5704.2.7.5, ensuring proper overfill protection for atmospheric tanks containing hazardous materials.