How position of bulkhead is determined?
How position of bulkhead is determined?
The position of the bulkheads along the length of the ship is primarily decided by the results of flood-able length calculations during the assessment of damaged stability of the ship.
Why were the bulkheads lowered on the Titanic?
After hitting the iceberg, water began flooding the Titanic’s forward six compartments. Bulkheads, watertight walls in the compartments meant to keep water from flooding the rest of the ship, were not tall enough to contain the water in the damaged compartments.
What is permissible length?
The length between bulkheads on a ship in order to ensure that it will remain afloat if one, or more, compartments are flooded. The permissible length is some fraction of the floodable length. The fraction is called the factor of subdivision.
How does a watertight compartment work?
The lower floors were split into compartments that would not let water into the rest of the ship. In other words, the watertight compartments were there to insure that if one part of the ship is leaking, the ship itself would not sink. They came up with this idea by cutting up bamboo plants.
How do you test a watertight bulkhead?
What are Testing of Water Tight Bulkhead?
- Bulkheads forming tank boundaries are tested by testing the tank.
- Peak Bulkheads, other than those forming peak tank boundaries, are tested by filling the peak to the level of the load waterline.
- Other Water tight bulkheads are hose tested to a pressure of 200 kn/m2.
How high were Titanic’s bulkheads?
Digging around, I find the bulkhead height was actually worked out during work on Olympic and carried over to Titanic. The final safety margin arrived at was 31″.
Why margin line is 76 mm below deck?
A line drawn at least 76mm below the upper surface of the bulkhead deck at side, (SOLAS). The margin line is a line defining the highest permissible location on the side of the vessel of any damage waterplane in the final condition of sinkage, trim and heel.
Is an imaginary waterline considered 75 mm below the uppermost continuous watertight deck?
The Margin Line of a ship is an imaginary waterline considered 75 mm below the uppermost continuous watertight deck. Once the waterline reaches the margin line at any point along the length of the ship, the ship is considered to be unsafe, and evacuation becomes mandatory.
How does a pipe pass through a watertight bulkhead?
Pipes passing through bulkheads are either welded, or fastened to the bulkhead by studs or bolts screwed through tapped holes in the plating. They must not be secured by ordinary bolts passing through clear holes in the plating.
What is bulkhead test?
Bulkheads forming tank boundaries are tested by testing the tank. Peak Bulkheads, other than those forming peak tank boundaries, are tested by filling the peak to the level of the load waterline.
How important is the height of a watertight bulkhead?
As an aside, watertight bulkhead height is only one factor of many aspects of the design of the watertight compartments. (It’s not widely appreciated that some of Olympic’s watertight bulkheads were actually lowered in 1912-13, even at the same time as others were raised.)
What is the difference between bulkheads A and B?
Bulkheads A and B, and all bulkheads from K to P, inclusive, further extended watertight up to the underside of D deck. (Bulkhead A further extended to C deck, but it was watertight only to D deck.) Bulkheads A and B forward, and P aft, had no openings in them.
What is the difference between bulkhead decking and bulkhead stringers?
Panting stringers are usually provided at every 2 meters from the bottom, forward of the collision bulkhead. The collision bulkhead must be watertight upto the bulkhead deck. A bulkhead deck is basically the deck level upto which all the watertight bulkheads are extended.
Why is the collision bulkhead not terminated at the bulkhead deck?
In case of ships having superstructures at the forward region, the collision bulkhead is not terminated at the bulkhead deck. It must be extended to the deck level next to the weather deck. This would ensure sufficient structural continuity and keep the shear forces within safe limits.
