Water that contains dissolved oxygen is corrosive to carbon steel, more so when its temperature is above ambient. The tank shell, heads and connections will oxidize rapidly if they are not protected. Stainless steel fittings offer some protection. When they are in good condition tank linings prevent hot water from contacting the steel directly but they too are vulnerable to damage over time especially at elevated temperatures.
Linings should be inspected periodically and patched as necessary.
If hot water is allowed to stagnate in a tank for long periods of time the water may acquire a brown tint. It is natural to assume that this is due to oxidation in the tank or piping but in fact it can also be caused by bacteria. Systems with constant flow rates do not experience this symptom.
If the Ph level of the water remains between 6 and 8 and its Langelier Index calculation is around zero the service life of the vessel will be maximized. Information about these measurements can be found on the internet.
Tanks that are installed outdoors are vulnerable to weather damage. Any cracks or gaps in the insulation must be repaired or caulked promptly to prevent moisture from penetrating and causing corrosion on the outside of the tank. Sprayed-on foam insulation
can separate from the tank due to moisture entrapment and heat cycles.
An inspection and maintenance schedule should be set up for all hot water storage tanks in service. Depending on experience and service conditions, inspection intervals can be adjusted. Of course, any problems found should be rectified immediately. Non-scheduled inspections should also be carried out as conditions dictate. For example, outdoor tanks should be inspected promptly if extreme weather events take place.
Any questions concerning Hanson hot water storage tank maintenance can be sent to info@hanson tank.com or by calling 800 421 9395 8am-4pm Mon/Fri Pacific Time..