What factor is considered when installing an expansion tank in a boiler system?

When installing an expansion tank in a boiler system, the maximum allowable working pressure (MAWP) of the boiler system is a critical factor. The MAWP indicates the maximum pressure that a vessel or system can safely withstand during operation. This aspect ensures that the expansion tank can handle potential surges in pressure without failure, thereby maintaining safety and operational integrity in the system.

Understanding the MAWP allows for appropriate selection and sizing of the expansion tank, ensuring it operates efficiently within safety limits. Failure to consider this could lead to equipment failure or catastrophic failure, resulting in safety hazards.

While the pressure rating of the system, volume of water, and size of the boiler are relevant factors in determining the overall system design and functionality, they do not primarily dictate the specific requirements for the expansion tank installation in relation to pressure management. Therefore, focusing on the MAWP provides a direct link to the safety and operational parameters for the expansion tank.