Warrina III said..
The exhaust was Webasto (stainless steel metal flex pipe) and the replacement exhaust is Webasto.
Leaving the silencer off has made no apparent difference to the sound level.
The Original (by a Webasto agent) installation did not follow their instructions.
The failed Webasto pipe didn't appear overheated and there was no sign of porosity as I've seen with 316 L used on boiler ash hoppers (in Power Stations) where salt water is used to fill the hopper. We had to use 316 Ti and also in high radiant heat area a special Sandvic material.
Maybe Webasto need to stick to Caravan heaters or yachts/power boats away from salt water.
Very unlikely that we are the first (or last) to experience this on a watercraft!!!
Know exactly what you are talking about as we make the erosion shields that they use in the the generators where the fire the coal dust in. We Have the material imported from Germany, can't remember the exact grade, but it is as hard as hell (stuff up our guillotine blades energy job) My boys made me some brackets and accidentally used an of cut. I could not drill it by hand for love nor money.
As you said the only option is to replace it every couple of years. This is certainly good information to people with Webasto heaters.
