What is the normal operating firemain pressure onboard?

The typical normal operating firemain pressure onboard is 150 psi. This pressure level ensures that the fire suppression systems have adequate water flow and pressure to effectively combat fires on a vessel. Maintaining this pressure is crucial for the reliability of firefighting operations, allowing firefighters to quickly respond to emergencies with an efficient supply of water.

This standard pressure helps ensure that hoses, hydrants, and other equipment function properly during a fire emergency, providing the necessary force to project water onto a fire. Systems are designed with this operating pressure in mind, balancing the need for effective firefighting capabilities against the safety and operational integrity of the ship's systems.