What is the minimum flowing pressure required for standard spray on upright, pendent, and sidewall sprinklers?

The minimum flowing pressure required for standard spray on upright, pendent, and sidewall sprinklers is specified as 175 psi. This pressure is critical to ensure that the sprinklers can effectively distribute water over the designated area to achieve optimal coverage and prevent the spread of fire. Adequate pressure is necessary to create the right water pattern and reach the required flow rate for effective suppression.

The requirement of 175 psi is established based on hydraulic calculations, which consider factors such as the type of sprinklers used, their spacing, and the specific fire protection design. Ensuring that this pressure is met is vital for the performance of the fire protection system, particularly in the event of a fire emergency.

In contrast, lower pressure values would not provide sufficient force for the sprinklers to function as intended. This could result in inadequate water distribution, leaving parts of the area unprotected and potentially allowing a fire to grow unchecked. Thus, maintaining the standard of 175 psi is essential for the reliability and effectiveness of sprinkler systems.