Floodable Length

General Page

There are normally three regions: aft, in way of and forward of the Engine Room. Their names and permeabilities are specified in the cells of the grid. These should be according to the relevant regulations. Regions can be deleted and new ones added. Note that the only the forward end of a zone needs to be given, as the program will automatically use the forward end of one zone as the aft end of the next. Also the first zone must start at the aft end of the vessel and the last zone must end at the forward end of the vessel.

The permeabilities for the three regions: aft, in way of and forward of the Engine Room are specified in the appropriate edit boxes. These should be according to the relevant regulations.

The required Compartment Standard, that is from one to nine, is selected from the simple drop-down menu. Other data items, as required within this dialog, are self-explanatory, however you should take care to ensure that the correct Design Draft is used.

The Subdivision Factor can also be specified by you, by checking the Given Subdivision Factor box and supplying the appropriate value.

Bulkhead Positions Page

The initial table of bulkheads is automatically compiled from the input hull geometry model, based on the longitudinal positions of all transverse bulkheads. However some of such bulkheads may not be actually destined to be water-tight and they may not be complete from port to starboard sides of the vessel. you may also wish to anticipate the placement of other fully water-tight transverse bulkheads. Thus you can both add to and delete from this initial list on opening the sub-menu by clicking the right-hand button with the cursor in the list field, These transverse bulkhead positions are then displayed on the floodable length graphical results.

The Add and Delete buttons add and remove bulkheads respectively and the Reset button resets the bulkhead positions to the initial defaults.

Margin Line Page

The deck edge is modelled using x, y and z coordinates. The X val, Y val and Z val are measured relative to the vessel's origin. The Deck Edge Points should correspond to the similar data that was input in the Edit > Opening dialog. However a more limited set corresponding to midships could be used. The vessel is assumed to be symmetrical about its center line. Clicking the Reset button will read in the deck edge points from the Opening dialog.

Points can be added or deleted using the Add and Delete buttons respectively.

The Margin Line is assumed to be the given distance below the deck edge.

Criterion of Service page

This page contains the data necessary to calculate the Criterion of Service according to the regulations, and hence the factor of subdivision to be applied to the floodable length curves.

Compartments making up the enclosed, machinery and passenger spaces, should be selected in the compartment list. Any additional spaces not included in the compartment list can be specified in the section below. you should enter the name, volume for each space and select its usage from the drop down list in the third column.

The Subdivision Length and Number of Passengers must also be given.

Note:
If there are no passengers, then the Criterion of Service will be unity and no correction is applied to the floodable length curves.