What is the minimum pipe size for any sprinkler?

The minimum pipe size for any sprinkler is 3/4 inch because this size is typically required to ensure that the system can deliver sufficient water flow and pressure to operate effectively. Smaller pipe sizes, such as 1/2 inch, may not provide adequate flow rates, potentially leading to underperformance in the sprinkler system. The 3/4 inch diameter helps to balance reduced friction losses, accommodate necessary water volume, and maintain consistent water pressure throughout the system.

While other options might suggest acceptable practices, they either do not meet the minimum requirements for effective sprinkler operation or lack a standard specification that universally applies to all sprinkler systems. This standard is essential for ensuring that the sprinkler heads function correctly and provide adequate coverage in the event of a fire, making 3/4 inch a reliable choice for installation in most residential and commercial scenarios.