on 30/06/2010, Brian on Harnser supposed : > Andrew Dyke explained : >> Evnin All, >> >> >> >> Can someone please clarify something for me. >> >> >> >> I have been told, quote "that in order for a boat to hold a valid BSS (Boat >> Safety Certificate) it needs to meet certain breather criterion which are >> designed to prevent "blow back" on filling" >> >> > I think Hudson boats have a dispensation or none of them would get a > ticket > l-)
http://www.boatsafetyscheme.com/downloads/BSS_Guide_chap2.pdf page 10 Potentially dangerous and polluting fuel blow-backs are known to happen during refilling. The tank also needs to be able to ‘breathe’ to help the supply of fuel to the engine or appliance. Temperature changes cause the volume of fuel to expand and contract. Venting needs to be effective at all levels of fuel in the tank. A vent line can also be a filling line, or an overflow line, and the requirement for a vent does not apply to small auxiliary tanks with a vented filling cap on the tank. -- Brian traveling on Harnser http://nbharnser.blogspot.com/
