For indirect systems in institutional and commercial applications, what is the maximum quantity of NH3 allowed?

In the context of indirect systems used in institutional and commercial applications, the maximum quantity of ammonia (NH3) that is permitted is 500 pounds. This limit is established to ensure safety and compliance with regulatory standards for handling refrigerants, particularly ammonia, which is considered a hazardous substance. Keeping the quantity of ammonia at or below this threshold mitigates the risks associated with potential leaks or exposure, as ammonia can be toxic and poses a variety of health hazards.

The regulation surrounding the maximum allowable amount commonly stems from guidelines set by organizations such as the Environmental Protection Agency (EPA) and safety standards that focus on minimizing risks in environments where large volumes of refrigerants are used. Limiting the quantity to 500 pounds is an important safety measure designed to protect personnel, the public, and the environment from potential harm. Additionally, this limit is aligned with industry best practices for ammonia storage and handling, thus reinforcing why it is necessary for institutional and commercial applications.