Regarding your question regarding fire with diesel
engines, while not as likely as with gas powerplants it is still possible. A number of years ago I managed to start a fire on a diesel motor
, some spilled fuel
and a short in a Lucas ignition system was all it took to get a good fire going. My instinct would be to keep the system you have (If legal) and install it on the new vessel.
It is possible by the time you discover an engine room fire that it may be dificult to fight with hand held extinguisers, this is where the automated sytems are helpful.
When I took my Halon bottle to the local fire extinguiser company I was told that Halon is illegal to use and that if the Coast Guard boarded us and saw that system I could be fined. I would be interested in finding out if this is true, is the 1301 type a newer and accepted system, money
for old Halon?