Which CODE?

[gonzo]

Not enough information. Is it a commercial vessel? How many passangers, if any. What do you mean by "very large range", say it in miles. Etc.

[Tevens]

3000nm, no passengers. all crew.

[gonzo]

You got to be really specific and detailed to be able to get a good answer. Is this vessel flying a UK flag?

[RAraujo]

With the scarce information given it seems that, from a Class point of view, you could use either LR SSC, BV HSC (depending on the displacement) ot other equivalent.

From a statutory point of view it will depend on the flag.

Rodrigo

[nemo]

Ok, this looks like a quiz! so it's not a yacht, why did you ask for a yacht code then?! If this is the case, you should comply with SOLAS and Load Lines, unless otherwise instructed from the Flag. That means that you should only comply with intact stability criterias. What's the exact Class notation? I assume it will have to be something like +100A1, SSC Mono Workboat G6, +LMC ...
However, with the information you provided, there are some design issues that come to my mind: there seem to be quite a gap between cruising speed and top speed, also considering that 20kn will be in the semi-displacement range for a boat of this size.. for which speed is the hull optimized?

[fcfc]

CE category A

No. CE and ISO rules are limited up to 24m. (78 ft). 30m is out of applicability range.

[fcfc]

Originally Posted by fcfc

No. CE and ISO rules are limited up to 24m. (78 ft). 30m is out of applicability range.

More, longitudinal hull strength is not checked by ISO, because for the intended boats, panel scantling is strong enougth. This is obviously not the case for longer boats.