At what size shall neutralizing sumps be chamber vented?

Neutralizing sumps are designed to manage wastewater that may contain acids or other harmful substances and require proper ventilation to ensure safe and effective operation. The requirement for venting a neutralizing sump comes from the need to prevent gas buildup, which could create dangerous conditions.

A sump with a capacity of 15 gallons or larger is stipulated to be chamber vented because, at this size, there is a greater likelihood of gas production from the chemical reactions occurring within the tank. Proper venting helps to disperse any hazardous gases and maintain appropriate pressure levels within the system. This safety measure becomes increasingly critical as the volume of waste and potential chemical reactions increases, making it essential for larger sumps to have adequate ventilation systems in place.

Smaller tanks may not necessitate the same level of ventilation due to their reduced capacity, which limits gas production and reduces the associated risks. The 15-gallon threshold serves as a standard to ensure safety and compliance with plumbing codes, which is why it is the correct answer in this context.