For a properly functioning fire pump system, what is a common size for the relief valve on larger pumps?

In fire pump systems, the relief valve plays a crucial role in maintaining consistent pressure and preventing overpressure situations. For larger fire pumps, a common size for the relief valve is 1 inch. This size is typically adequate to handle the flow requirements of larger pumps while ensuring that excess pressure can be released effectively without causing damage to the system components.

A 1-inch relief valve allows for proper flow capacity in relation to the output of the pump, which is essential in reducing the risk of pressure surges. Smaller valves, such as ¾ inch, may be inadequate for larger pumps because they could restrict flow, leading to potential system failures or damage. Likewise, while a 1½-inch or 2-inch relief valve may seem more robust, they are often unnecessary for standard configurations, as the increased size can lead to higher costs and complexity without corresponding benefits in many cases.

Thus, a 1-inch relief valve serves as a balanced and effective choice for larger fire pump systems, ensuring safety and functionality.