Difference between conventional and open container ships

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Difference between open top design and conventional design of Container ships are:-

1. Cargo access --
       Cargo holds are accessible for the crew through lashing bridges and inclined ladders at both ends of a container bay. These structures can be entered from main deck and from alleyways next to the hold.

2. Ventilation --
     The ventilation capacity is at least two air charges per hour based on the empty hold criteria. These mechanical system work either by extraction from the bottom of the hold by means of exhaust ventilation or with natural exhaust generated by a supply ventilator. The air flow on open top ships is affected by air entering through the open holds. Due to open structure, gases lighter than air can disappear even without mechanical ventilation.

3. Bilge pumps ---
     Open top container ships are equivalent with higher capacity bilge pumps in order to remove green water shipped in seagoing condition and rain. At least three pumps are provided. At least one of these pumps should be of full required capacity. The combined output of at least two other pumps shall be not less than the required capacity.

4. Fire detection ---

  •      Laser fire detection system
  •     Extraction smoke detection system
  •     Ionization type fire detection system
5. Electrical system
    Electrical installation should be certified safe type for use in the dangerous environments to which they may be exposed unless it is possible to completely isolate the electric system

6. Fire extinguishing --
    The fire protection system for open top container holds is based on philosophy of containing the fire in the bay of origin to cool adjacent areas to prevent structural damage. The holds are protected by  a fixed water spray system which is capable of spraying water into the cargo hold from deck level downward. Spray nozzles are located circularly around each bay of the entire open cargo hold. In case of fire the container bay of origin can be isolated with a water curtain. meanwhile the adjacent containers and structures can be cooled. On the deck measures include fire pumps, hydrants, hoses as well as portable fire extinguishers. 

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