How high should gravity tanks be positioned above the highest line of sprinkler heads?

When determining the height for positioning gravity tanks above the highest line of sprinkler heads, it is essential to ensure that sufficient water pressure is provided for effective sprinkler operation. The standard practice calls for a height that typically ranges around 25 feet to ensure adequate pressure for proper water distribution.

Positioning the tank at this height helps achieve a pressure of approximately 10 psi at the most remote sprinkler head, assuming standard conditions. This is crucial because sprinkler systems rely on gravity-fed water supply, and having the tank elevated sufficiently creates the necessary hydrostatic pressure to allow the system to function effectively.

Choosing this standard height also considers factors such as the minimum pressure required for proper sprinkler activation and performance, as well as accommodating potential pressure drops due to piping friction losses over distance. Therefore, a height of 25 feet is a widely accepted practice to ensure optimal operation of sprinkler systems across various applications.