How High Pressure Water Mist Fire Fighting System For Ships Works?

By Creations -

How High Pressure Water Mist Fire Fighting System For Ships Works?


check out and watch this video from youtube to understand easily
click this link to redirect to youtube


The hyper mist or high pressure fog fire fighting system is installed for all important ship’s machinery systems in the engine room (ME. AE, Purifier, Boiler etc.). The high-pressure water mist/fog system provides water mist protection during emergencies to engine room areas and machinery spaces. This system is independent of any other fixed fire fighting system such as foam or CO2 system.
Following are the most common areas covered by water mist system:
  • Incinerator room
  • Auxiliary boiler room
  • Auxiliary generators
  • Main engine cylinder head platform
  • Purifier room
  • Inert gas generator room
  • Steering gear room
    • A fresh water pump takes suction from fresh water tank to supply high-pressure water to the sprinkler system. Each area is isolated by valves, which can be opened during emergency situations involving fire. The system is kept at constant stage of readiness.
    The MICROFOG Fire Extinguishing System has the following effects:
    • Cooling effect (quick cooling by evaporation latent heat)
    • Oxygen replacement effect (replacement of air with water vapor generated in a large quantity, and absorption of radiation heat)
    • Shut-off effect (the floating fog forming walls of water)
    • Smoke eliminating effect (the floating smoke particles being adsorbed and settled by the fog)
    High-pressure water is injected through a special nozzle working within pressure range of 4 to 10 MPa (depending upon the design of the system), which breaks the water droplets into fine mist. The diameter of the water mist particle range from 50 to 200 µm which improves the fire extinguishing effect and efficiency of the system. The distance between any two nozzles is very critical as area covered by one nozzle must be such that no space is left unsprayed in the fire affected area.
    Operating Procedure:
    The system start select switch on the main control panel must always be set to AUTO & MANUAL position for automatic start. (The automatic activation with the fire alarm system is possible only in this mode.)
    Starting:
    Automatic Start: Water mist system will be automatically released into the protected area where fire is detected by the fire alarm system (both smoke and flame detectors), and an audible and visible alarm is activated in that protected area.
    Manual Start: Water mist system can be started manually from the control panel and from the local points whenever needed, independent of the fire alarm system.
    The following conditions must be maintained at all times to ensure hyper mist system is on stand by for operation:
    1. Sufficient water level must be retained in the fresh water tank
    2. Make sure the power supply is available.
    3. The fire alarm system must be in operation.
    4. Drain and test valves must be closed.
    5. The area around the Hyper mist water pump must be clear of any obstructions.
    Stopping:
    After confirming extinction of a fire, the water mist system can be stopped manually by cancelling the signal from the fire alarm system and pressing the STOP button on the control panel or local point.
    Watch High Pressure Water Mist Fire Fighting System On World’s Largest Ship:

Comments

Post a Comment

Popular posts from this blog

Important Points For Inspection and Maintenance of Ship’s Engine Room Crane

By Creations -
Whether it’s overhauling of main engine/ machinery or shifting of heavy parts, the engine room crane is regularly used for “heavy-duty” jobs, which are usually beyond the physical capabilities of the engine room crew. Th engine room personnel are qualified to operate the crane in a safe manner but as a machinery, the crane is subjected to breakdowns if proper maintenance and care is not taken. The scenario can be worse if the crane fails in the middle of lifting the load or while carrying out important machinery overhauling. As a responsible officer on ship, the engineers using the crane must do regular inspection and scheduled maintenance to ensure the crane works safely without giving up at all times. The engine room crane has a Safe Working Load (SWL) limit, which should never be crossed at all times. The crane manual is the best source to understand when and what inspections or maintenances are required. In our previous article on engine room crane, we discussed the safet
Read more

oily water seperator (ows) maintenance tips

By Creations -
oily water seperator (ows) maintenance tips. Every engineer on ship knows the importance of oily water separator (OWS) and must have heard stories of legal actions taken against seafarers who tried to fiddle or bypass the automation system of the OWS. The most common cause of people tempering with oily water separator is deterioration of performance of the system. Apart from the filter getting clogged due to continuous usage, there can be many other reasons for the lack of performance. A few critical points, which are often ignored and less commonly known to engineers operating oily water separator on daily basis, are discussed in this article to ensure efficient performance of oily water separator (coalesce filter type) used onboard ships: 1. Oil In Bilge:  The separator is suitable for separating small quantity of oil in bilge and not the other way round. If there is a mixture consisting of small quantity of water in oil, better not to pass it though the OWS and dire
Read more