Hi Fog

Question 1

What system do you have onboard and its main components?

Answer 1

Marioff Hi-Fog 3000

• 3 x 27kw electric motors producing 80 bar (3rd is redundancy)
• 10 x 20lt water cylinders
• 4 x 150 bar nitrogen cylinders
• Section valves for certian spaces

Question 2

How is it tested?

Answer 2

Every year we have Marioff come onboard for an annual service and test.

Monthly we will isolate the Nitrogen and water cylinders. Then run up the system by opening the test valve which will create a drop in pressure and start pump one. We can then isolate pump one, so pump two will start and so on. This then dumps into our fwd grey water tank. Everything is then returned to normal standby operations and pressure returned to around 25bar.

Question 3

Draw your Hi Fog system?

Answer 3

See one note

Question 4

What maintenance is carried out?

Answer 4

• Oil level inspections
• Visual inspection
• Perform water quality checks every year
• Test of alarms
• Flush each section
• Examine cylinders
• HI Fog SW strainer
• Overhaul valves and relief valves
• Hydrostatic tests

Question 5

What survey items are there?

Answer 5

• Section Valves
• Bulbs
• Heads
• Discharge Valves
• Alarms

Question 6

What pressure does a high fog system operate at?

Answer 6

When it drops below 17 bar it will start up. Our system will run between 50-90 Bar depending on demand

Question 7

Explain a full system walk through including checks and operation?

Answer 7

• All valves are lined up for fire fighting
• Pumps inspected
• Pipework has no leaks
• No alarms on control panel
• Smoke/ heat detectors identify fire
• Accommodation a bulb will break and automatically start due to pressure loss
• ER is manual activation from fire fighting station

Question 8

What happens if your main and emergency power to the hi fog fails?

Answer 8

In the event of a power failure then the nitrogen can manually be released and will force the fresh water out. This will be a one shot use.

Question 9

What are the standby and running pressure?

Answer 9

• Standby 25 Bar
• Running 50 to 120 bar

Question 10

How does the nitrogen activate and what / where does it go? What pressure is in the bottles?

Answer 10

Upon detection of a fire, the control panel sends a signal to the system, opening the valve on the nitrogen cylinders. The released nitrogen flows into a water tank or directly into the piping system, pressurizing the water.

150 Bar