Browse Forums DIY, Home Maintenance & Repair 1 May 22, 2009 2:35 pm Hope someone can help me. I have a hot water storage tank made from galvanised sheetmetal that has suffered a bit of corrosion internally. The tank was fabricated to my design and has been in service for 4 years. It is connected to the wetback of a combustion stove. My mistake was to use galvanised sheetmetal - should have been stainless steel or other non-corrosive material. Anyway I'm stuck with it, and I'd like to overcome the problem. Has anyone got any ideas as to what protective coating could be applied to the interior? I've already used one epoxy paint system, but no success there. The critical parameters are - a. ability to withstand long periods at high temperatures (approx. 80C) b. good bonding to the substrate surface c. waterproof d. non-toxic The coating would need to be cold-applied as the tank is insulated and therefore can't be subjected to a heat process as with vitreous glass. Would appreciate any clues. Re: repair of thermosiphon hot water tank 2May 22, 2009 6:17 pm I think youre asking a bit much. Your tank should be copper. Anything else will as youve found out corrode. Domestic hot water units are fabricated from black steel, are fibreglass lined with a sacrificial annode. Ther last on average, 10 years although Ive replaced many that were less than 6 years old. 18 74713 From what I know about water tanks (I've been working with a client on them for a few years now) is this - The concrete can last a lifetime if they don't crack for some… 2 6479 If you can calculate the reasonable charged head from let's say 100mm below the gutter to the top of where the vertical riser's horizontal discharge pipe will be, that… 11 14445 |