Don't get me started. There are photos on our web page about these waterlocks. The
epoxy coating will not
work. Trust me on this...
I built a
food factory once, you might know the product as Weetabix. We had 12 rotating steam powered retorts that cooked the grain with a mixture of
salt and sugar. The "FDA" equivalent required us to use
Stainless Steel 316L. They retorts lasted on average 6 weeks before springing a leak. I had one made with a low grade of SS, 3cr12, and it outlasted the others by a factor of 8. I then had one made up in boilerplate as an
experiment. It lasted years and years. The
corrosion you are talking about is a chemical reaction that erodes the
steel, the Cr that is contained in
stainless steel must be in an O2 rich
environment. In an O2 depleted
environment, the crevasse corrosion runs rampant (same reason you never have a stainless swivel or shackle on your ground tackle, and others)
Gilana was built to Lloyds 100/A1 scantlings. Our whole
exhaust was stainless
steel with rubber vibration bellows. The
generator too had a 55Lb stainless box aqualift, with enough capacity to hold 3x the runback of the exhaust system.
I have removed, welded, fixed patched and cursed, until one day I chucked them out and put in a GRP one on the Detroit, and a plastic one on the Gen. I chucked the SS exhaust lines and replaced with exh. hose. I have never looked back since. IF you epoxy coat, you deny oxygen to the steel, precisely by coating the steel you will destroy it.
Get yourself a Vetus, or equivalent
lift, and say good friggen riddance!
Trust me...