Fuel System Double Hose Clamps?

I recently received a query from a reader regarding a requirement for double hose clamps on all of the hoses in his boat's fuel system. It seems that during a recent survey for insurance the surveyor recommended that double clamps be added "based on ABYC Standards". The reader is a little confused because the boat hasn't been modified since new 6 years ago. So, what's the real deal here? This one is easy to answer. The ABYC does NOT require that double hose clamps be used anywhere in your ...