Massachusetts Plumbers Journeyman Practice Exam 2026 – All-in-One Guide to Master Your Licensing Test!

The minimum size floor drain trap required for a Boiler Blowoff Tank to safely cool the discharge is 2 inches. This specification is based on typical plumbing codes and safety standards designed to handle the volume and temperature of water that a blowoff tank can produce.

Using a 2-inch trap ensures adequate capacity to manage potential fluctuations in the discharge flow. It also helps to prevent blockages that could occur if a smaller trap is used, which may not handle the cooling water effectively. A larger drain trap allows for better drainage efficiency, minimizing the risk of overheating and subsequent damage or hazards associated with improperly cooled discharge water.

This larger size is critical for maintaining the safety and operational efficiency of the boiler system, as well as ensuring compliance with applicable regulations.