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Large Copper/Brass Water Tank

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PUMPMANPLEE

PUMPMANPLEE

Mechanical
Mar 29, 2003
19
Greetings all Materials/Corrosion Engineers,

Does a copper/brass water tank require Anode
corrosion protection for long life service ???

I'm currently constructing a large number of
copper/brass tank which has the following specification:

-A life of 20 years minimum.
-Number of tanks = 25 to 30
-Capacity each tank = 315 Liters
-Used for storing MUNICIPAL potable drinking water.
-The tank will be heated to 60 degrees Celsius
using an electrical element located at the
base of the tank.
-The tank will not be under pressure.
-The tank will have a sealed lid.
-The stored water will flow by gravity to
distribution points downstream.

...thanks for any assistance.

PUMPMANPLEE
 
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I've never seen any type CP protection used in Cu storage tanks though yours is larger than most that I'm acquainted with. Any corrosion will depend on the purity of the water stored. If fairly pure and has CO2 then expect a little corrosion until a film can form. Any degree of hardness,
Ca, Si, or Mg, will help protect the Cu.
Cu storage tanks were one of the first fallouts from the Pb contamination point of view.
 
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I would monitor the inside often, either visually or with a "electrical corrosion probe" because your conditions can make for a MIC problem. Cu and its alloys are NOT immune from this, and 60 deg C isn't high enough to sterilize. SRBs and other bacteria can live in drinking water.

One good contact you can try is Structural Integrity in CA. There are many others too.
 
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