Isolation of the Sprinkler System

Sprinkler systems onboard are divided into multiple sections, each equipped with an individual isolation valve and alarm for easier maintenance. The following steps outline the procedure to isolate one section of the system for routine maintenance:

• Inform the bridge about the planned maintenance, providing details of the section being isolated and the expected duration of the work.
• Place the seawater pump in manual mode and switch off its breaker to prevent unintentional operation.
• Isolate or disable the alarm for the section where the maintenance is to be conducted.
• Shut the isolation valve for the specific section to prevent water from entering it during maintenance.
• Drain the sprinkler line of the isolated section completely before proceeding.
• Follow the lockout and tagout procedures to ensure no accidental activation occurs while maintenance is underway.

Once the section is isolated, the following tests and inspections should be performed:

• Inspect the overall condition of the system and its associated equipment.
• Test the alarm system to ensure proper operation and detect any faults.
• Sprinkler Heads:
  • Inspect sprinkler heads for cracks, corrosion, and salt deposits.
  • Ensure they are clean and free of obstructions.
• Pressure Tank:
  • Check the water level in the pressure tank.
  • Test the operation of the float switch and verify the functionality of the low-level alarm.
  • Inspect the tank’s pressure relief valve to ensure it operates correctly.
• Operate all valves to confirm free movement. Apply grease to valve mechanisms if necessary to ensure smooth functioning.
• Drain and flush the system in accordance with the Planned Maintenance System (PMS) to remove any accumulated debris or deposits.
• Seawater Pump:
  • Test the automatic operation of the seawater pump.
  • Inspect the pressure switches for proper functioning.
• Check the non-return valve to ensure it is in good working condition and preventing backflow effectively.

After completing maintenance, the system should be restored to operational status using the following steps:

• Close all drain valves to prevent water from escaping the system.
• Open the isolation valve of the section to restore water flow.
• Refill the pressure tank with fresh water up to the normal operating level.
• Open the air valve and pressurize the tank to the required level (7-8 bar).
• Conduct a thorough inspection to ensure there are no leaks in the system.
• Turn the breaker for the seawater pump back on and set it to "AUTO" mode for normal operation.
• Remove all lockout and tagout devices applied during the maintenance process.
• Inform the bridge that the maintenance is complete and the system has been returned to service.