Automatic Fire Extinguishers
Scott,As far as I know (working in fire protection and suppression for 20 odd years) USCG regs do not address automatic extinguishers for a diesel powered vessel your size. I haven't checked recently but most likely the standard portable ones would be adequate.There are some neat innovations in automatic extinguishers one is FireTrace which overcomes the problem of where and which direction to place the nozzles which is often done by best guess. LandRover uses a similar system and they can be seen on trucks.On foam extinguishant my opinion is the area doesn't have to be enclosed, Ansul systems are extremely effective in suppressing an open range fire in a restaurant but a real pain to clean afterwards.Hope this is helpful,Alan