According to the CSA B-51 code, why is a blowoff tank necessary?

The necessity of a blowoff tank, as indicated in the CSA B-51 code, is primarily related to its function in managing the temperature and pressure of water before it is discharged into the sewer system. When blowoff water is released from a boiler, it can be at elevated temperatures and pressures, which could create hazardous conditions in the plumbing system. The blowoff tank acts as a containment area that allows the high-temperature and high-pressure water to cool down and depressurize safely before it is sent to the sewer. This helps prevent thermal shock and potential damage to the sewer lines and ensures that the discharge is within safe limits for municipal wastewater systems. As a result, it serves a critical role in maintaining safety and compliance with regulatory standards for boiler systems.