How many feet must NH3 relief discharge be located from doors, windows, or vent intakes?

The correct answer indicates that NH3 (ammonia) relief discharge must be located 20 feet away from doors, windows, or vent intakes. This requirement is established to ensure safety and minimize the risk of ammonia vapors entering occupied spaces. Ammonia is a hazardous material that can pose health risks when inhaled, even in small quantities. By maintaining a distance of 20 feet, regulations aim to prevent the potential for exposure in areas where people may be present, particularly in residential or commercial buildings. This distance allows ample space for the ammonia to disperse and reduces the likelihood of it being drawn into ventilation systems or entering through doors and windows, thereby enhancing overall safety.

Adhering to this established distance also reflects best practices in hazard mitigation, ensuring that facilities handling ammonia are designed to protect both personnel and the public from the dangers of ammonia exposure. Knowing and following these guidelines is critical for anyone working with high-pressure piping systems that involve ammonia.