What is the minimum discharge pressure for an automatic sprinkler system on a vessel?

The minimum discharge pressure for an automatic sprinkler system on a vessel is set at 15 psi. This specification ensures that the sprinkler system can provide an adequate and effective level of water distribution to extinguish or control fires.

A discharge pressure of 15 psi allows the sprinkler heads to operate effectively, creating a necessary water curtain to suppress flames and reduce temperatures within the area they protect. The design takes into account the pressure needed to overcome the system's friction losses and the height differences in the distribution system, ensuring that water reaches all intended areas during an emergency.

Setting the minimum at this level also considers the need for maintaining adequate flow rates through the system, critical for achieving the desired coverage and effectiveness of the fire suppression measures. Pressures lower than this could result in insufficient water spray and compromised firefighting capability, potentially allowing a fire to spread more easily on board.