Passenger Vessels (Generic & Ro-Ro) Flashcards
PASSENGER - Define the term: bulkhead deck
Bulkhead deck: the upper most continuous watertight deck, and where the ship shell is carried to
PASSENGER - Define: subdivision loadlines
Additional load lines marked on passenger vessels to take into account the variable use of spaces for passengers or cargo.
If Pax Vessel to load CARGO ONLY: can submerge to the standard loadlines (summer, winter etc)
If Pax Vessel loads 1 PAX or more: then have to comply with the additional subdivision loadlines
PASSENGER - what are the different type of subdivision loadlines?
- C1 - principally passenger carriers
- C2 - passengers in tween decks (alternative = Passenger & Cargo)
- C3 - passengers in lower decks (alternative = Passenger & Cargo)
The subdivision load line mark CANNOT be above the Summer mark
PASSENGER - which documents would you find your subdivision load lines?
- Passenger Ship Safety Certificate
- International Load Line Certificate
- Stability Data Booklet
PASSENGER - Summarise the damage stability information supplied to Masters
- Plan showing each deck with boundaries of watertight compartments
- The openings of those compartments
- Correction arrangements if list due to flooding
- Activation of Damage Stability Support
Booklets of all the above information given to officers should be included, that is easy to understand
PASSENGER - Outline what is meant by the term “attained subdivision index A”
The “probabilistic” chance of survival after collision, measuring the ships’ safety in the damaged condition.
Probability for each damage scenarios the ship would be subject to, calculated then combining that with the chance of survival (basically, attained subdivision index A = damage scenario x probability of survival)
This is all dependent on number of factors:
- Compartment or a group of compartments
- Transverse and longitudinal damage extent
- Probability that ship will survive with compartment/s flooded
PASSENGER - Outline what is meant by the term “required subdivision index R”
The minimum value of A, it is dependent on the following:
- Ship size
- Passenger count or
- Other factors legislators might consider important
RO-RO PASSENGER - Describe the stability issues associated with Ro-Ro Pax Vessels?
- FREE SURFACE EFFECT: large, open car decks, fire fighting appliances, blocked scuppers
- WINDAGE: large windage area, wind heeling moments
- CARGO SHIFT: loose lashings on the vehicles
- BOW / STERN DOOR: “could” compromise watertight integrity (if failure)
- BOW DOOR: if damaged close to waterline, accumulation of water fore, stern draught, WPA and GM decreases
- CARGO DEADWEIGHTS: these are estimated
- PERMEABILITY: high on the car decks, due to lack of subdivisions
RO-RO PASSENGER - Describe the methods to improve stability on these ships?
- LARGE SCUPPER & HOLDING TANK SYSTEM: to store fire fighting water and sea water on deck
- INNER BOW DOOR: with a traffic light system to indicate closure
- WT INTEGRITY BELOW BULKHEAD DECK: either by WTD’s or other closings
- FITTING OF SPONSONS: increase the waterplane area of the ship
RO-RO PASSENGER - What is the Stockholm Agreement?
Extra stability requirements for Ro-Ro Pax Ferries. It is based on the amount of water the vessel can take on after damage depending on the residual freeboard. This is in reference from the FIRST DECK ABOVE THE UPPER MOST CONTINUOUS WT DECK
RO-RO PASSENGER - Describe the requirements in the Stockholm Agreement
Based on a 4.0m significant wave height, if the vessel was to damage ABOVE the WT bulkhead deck:
- 0.5m HEIGHT OF WATER ALLOWED if residual freeboard is 0.3m OR LESS
- 0.0m HEIGHT OF WATER ALLOWED if residual freeboard is 2.0m OR MORE
LSA - what is the capacity of PASSENGER ship survival craft?
WITHOUT MES:
- Boat = 50% each side
- Raft = 25%
TOTAL = 125% capacity
WITH MES:
- Boat = 37.5% each side
- MES = 50%
- Additional MES rafts = 50%
TOTAL = 175% capacity
LSA - what is the expected time of evacuation for PASSENGER ships?
30 minutes from abandon ship signal given
