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Exhaust Elbow leak

PostPosted: Fri Apr 15, 2011 7:22 am
by sv.grainne
New Exhaust Elbow

Have about 500 hours on the new exhaust elbow and it has starting leaking salt brine and exhaust gases. Have you had similar results with other systems in use in salt water? The pin holes appear to be located in the 1 1/2" diameter exhaust pipe adjacent to the raw water injection port. Not a weld problem but some sort of crystalization of the metal itself.

Considering fabricating a new elbow using thick wall 316L Stainless. :(

Bobby
St Georges, Grenada

Re: Exhaust Elbow leak

PostPosted: Fri Apr 15, 2011 11:24 am
by Coulomb
The mixture of salt water and hot exhaust is always a problem area, but 500 hours seems low.

Definitely use 316L.

Re: Exhaust Elbow leak

PostPosted: Mon Apr 18, 2011 4:39 pm
by sv.grainne
I agree - what was wrong with the original part? I took the elbow off today and found several cracks in the 1 1/2" exhaust tubing - one was leaking exhaust and the other exhaust and salt brine - what a mess. Had to chisel the exhaust wrap off in spots as the salt encrustation was so bad - expect that this actually failed at just over 400 hours!

Bobby