GHS Port Reference Center
Information for maritime designers, engineers and builders
Maintained by Creative Systems, Inc., Creators of GHS
Click here for information about GHS and other fine marine software.
Go to Main page

Flooding drydock ballast tanks to the bottom of air vents
    `Demonstrates using GHS to figure out where a drydock will sink down to.
    `When the flood valves are left open the tanks will load to the
    `bottom of the air vents in each ballast tank.
    proj bubble
    `Make a simple hull with tanks:
    enter pm
    create hull
    ends 0 100
    out 10
    top 10
    bot 0
    create tank1.c
    ends 30 50
    fit hull.c
    create tank2.c
    ends 50 70
    fit hull.c
    quit pm
    `Establish light ship:
    depth 5
    vcg 5
    solve weight, lcg
    tank * `<-- selects all tanks
    type bubble
    `The point of flooding/venting is represented by the reference point:
    ref top `Reference points at top
    ref * * 6 `Now lower the vertical coordinate to vent bottom.
    `Since the tanks will not flood until the water level is at or above the
    `reference points, we have to load them to that point explicitly.  This
    `also establishes the 1-atmosphere air volume:
    load ref:0
    `Now solve for equilibrium and report the status:
Add a free link to your site
Copyright © , Creative Systems, Inc.
Privacy policy