Ship Construction

Question 1

Explain how freeing ports assist in maintaining stability of a ship

Answer 1

they get rid of water retained in the side shell of the upper deck, which prevents a raised center of gravity, a large free surface effect, prevents a reduction in the effective metacentric height, also prevents capsizing. freeing ports also relive stress

Question 2

what is a Bilge keel?

Answer 2

it is a offset bulb plate attached to the bilge radius. it can help reduce rolling by about 30 percent

Question 3

what is a Freeing port

Answer 3

a Freeing port is attached between the bullwark and sheerstrake, it allows us to rapidly unship water and reduces bending stress

Question 4

What is longitudinal?

Answer 4

it runs fwd to aft and is a bar stiffener that helps strengthen and support plates

Question 5

what is a Frame

Answer 5

A frame is a transverse stiffener that runs transversley along the ship, it is used to strengthen and support ships plating

Question 6

what is a hawse pipe

Answer 6

allows chain to pass through the forecastle of the ship and usually has sea water washing

Question 7

what is a chain stopper

Answer 7

an iorn bar or wire that sits on the links on the anchor chain and is used in case of the breaks failing to prevent the anchor from falling. it also takes strain of windlass and puts it into ship.

Question 8

what is a fairlead?

Answer 8

a fair lead is a roller or rounded hole that allows ropes to pass from mooring Station to the jetty prevents the mooring ropes from cutting or fraying

Question 9

what is a bollard

Answer 9

a bollard is used to tie off mooring ropes and transfer load from winch into the ship

Question 10

what is plate floor

Answer 10

they provide transverse stiffening and strength. they run transversley across the vessel. lightening holes help reduce weight and allow for access. they also provide support to the inner bottoms and tank tops

Question 11

what is a watertight bulkhead

Answer 11

it must run the full width of the vessel, and from the ships keel to the upper deck. it is used for strength, especially for water racking and pressure resistance. segregation, it separates incompatible cargoes and spaces. subdivision, it subdivided the Hull into watertight compartments to prevent spread of flooding. safety, it will act as a main barrier towards fire and act as an emergency fore end or collision bulkhead

Question 12

what is a watertight bulkhead

Answer 12

it must run the full width of the vessel, and from the ships keel to the upper deck. it is used for strength, especially for water racking and pressure resistance. segregation, it separates incompatible cargoes and spaces. subdivision, it subdivided the Hull into watertight compartments to prevent spread of flooding. safety, it will act as a main barrier towards fire and act as an emergency fore end or collision bulkhead

Question 13

how may watertight bulkhead integrity be tested

Answer 13

1. fire hose test to test tightness of structural items that contribute to the watertight integrity
2. hydro-pneumatic test a combination or hydrostatic and air testing to check the integrity of the water tight bulkhead

Question 13

how may watertight bulkhead integrity be tested

Answer 13

1. fire hose test to test tightness of structural items that contribute to the watertight integrity
2. hydro-pneumatic test a combination or hydrostatic and air testing to check the integrity of the water tight bulkhead

Question 14

what is the shear strake

Answer 14

the upper most section of the shell plating, furthest form the neutral axis. this means it has to withstand high bending, compressive and tensile forces

Question 15

what is a cofferdam

Answer 15

a void space, it can also be used to separate different tanks

Question 16

construction of a fwd collision bulkhead

Answer 16

it’s a transverse bulkhead extending from keel to the bulkhead deck. these are normally 12% thicker than the other watertight bulkheads, they can be of plain type or corrugated type

Question 17

construction of the fwd collision bulkhead

Answer 17

it’s a transverse bulkhead extending from keel to the bulkhead deck. these are normally 12% thicker than the other watertight bulkheads, they can be of plain type or corrugated type

Question 18

function of a fwd collision bulkhead

Answer 18

to prevent water from flowing aft in the event of a collision or a ships Hull becoming damaged pierced or developing failure to the bulkhead

Question 19

position of a fwd collision bulkhead

Answer 19

it will be found no more than 5% of the ships length away from the fwd end of the ship