how to define a tank in ghs

[hello]

i want to difine a tank in ghs.
because the ship will chang to double shell,
so that tank with a surface offset from the shell(760MM).
i can't find the command for offset in ghs.
does angbody can help me to do this?

[GHS]

use the inboard and outboard commands in partmaker. See the Part Maker section in the GHS manual

mike

[CDBarry]

There are thickness options in the tank and in the surface that it is defined within. You situation is why they are available.