diesel and water tank materials and volumes

[bigbear69]

Hi,
wondering what would be enough volume in diesel and water tanks for a 42ft steel yacht. I'm intending to go offshore.
2 options with my diesel, either mild steel or stainless. any ideas on what is best and what gauge steel and stainless steel should i use in the diesel and water tanks?
any help would be much appreciated.
Tim

[TeddyDiver]

It's not that simple.. lot of variables to consider.
How long periods out?
How many onboard? (1 female=3 male in water consumption)
Having tight time limits?
Fridge, Watermaker etc

[bigbear69]

Thanks Teddy,
So i guess if I want to offshore (ie round the world) I need to have a watermaker? people onboard would range from 2 to 6 probably. There is a fridge installed.

[SamSam]

Look at post #11 in this thread. You can E-mail the guy for more info.
http://boatdesign.net/forums/showthread.php?t=17656
I've seen it said where welded stainless tanks were limited to 20 gallons because the welding caused brittleness and then flexing caused cracks.