What engine pressure is typically needed to start pumping into a sprinkler system?

To start pumping into a sprinkler system, an engine pressure of around 150 psi is typically needed. This level of pressure is essential for overcoming the static pressure within the sprinkler system and ensuring that water will flow adequately through the pipes and into the sprinkler heads. Sprinkler systems are designed to operate effectively at pressures that usually range from 150 psi upwards, allowing for proper distribution of water to each area that the system is meant to protect.

The choice of 150 psi allows for designated allowances within the system, ensuring that the pressure is sufficient to reach all parts of the system while maintaining functionality under varying operational conditions. Different sprinkler systems and layouts may require adjustments in pressure to accommodate specifics such as elevation changes or the layout of the piping, but 150 psi serves as a standard starting point for effective system operation.

Lower pressures such as 75 or 100 psi may not provide enough force to activate the sprinkler heads or could lead to an inadequate water supply, while 200 psi is generally unnecessary for most residential or commercial systems, potentially putting undue stress on the system components.