New York Low Pressure Boiler COF Practice

When installing an expansion tank, what factor must be considered?

1. The total water capacity

2. The MAWP of the boiler system

3. The height of the building

4. The length of the piping system

The correct answer is: The MAWP of the boiler system

When installing an expansion tank in a boiler system, it is crucial to consider the Maximum Allowable Working Pressure (MAWP) of the boiler system. The MAWP indicates the maximum pressure the system is designed to withstand safely, which directly influences the selection and installation of the expansion tank. An expansion tank must be rated to handle this pressure to prevent failure, leakage, or bursts that could compromise system safety and efficiency. Using a tank that does not meet or exceed the MAWP can lead to safety hazards and potentially catastrophic system failures. It ensures that the expansion tank can accommodate the expected thermal expansion of water as it heats up without introducing excess pressure that could damage the tank or other components in the system. Therefore, understanding and adhering to the MAWP when selecting and installing an expansion tank is essential for the safety and functionality of the entire heating system.