Originally Posted by impi
HUH ??? would like to know more about this ...
Years ago i installed a wet exhaust
on our mono, i welded up SS bends to take the exhaust
from the 4108 Perkins
to the transom using steam hose (rubber) in between.
I hose clamped the hose to the stainless tube.
I injected seawater into the exhaust system to keep all cool. It worked beautifully the flexing hose absorbing the noise
along with the water
muffling it. I had no commercial
About 18 months down the track i had to remove it all to fit a new freezer
in, when i undid the hose clamps the SS tubing was corroded directly under the clamps.
Now this was a steel
round bilge boat
and from the hull
to the engine
there were three SS tubing components. The problem is a current
flows through such things and if these things are not common to each other then there is a risk of sacrificial corrosion
same as an anode.
I rebuilt the fittings and upon assembly i placed a SS strip 10mmx.5mm between the rubber and hose clamping it in place with the hose clamps, so effectively every element was bonded to each other the hull
and the engine
20 YEARS LATER still no corrosion
Under USL Code for commercial
vessels in survey
all piping that has a rubber interconnection must be electrically bonded to prevent sacrificial corrosion between.
Although the pundits will criticise with their own hypothesis facts are facts our corrosion simply ceased.