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DKL Engineering, Inc.
Maintenance and Inspection - Pump Tanks
September 15, 2003
The brick lining in this pump tank has been compromised such that the acid has leaked through the brick lining to the carbon steel shell. The carbon steel shell has corroded completely through exposing the sulphate that has built up between the brick and the shell.
When acid penetrates through the brick lining of a flat bottom pump tank, the carbon steel shell will corrode resulting in sulphate formation. The sulphate formed occupies a greater volume than the parent material and begins to exert pressure on the shell and the brick lining. One of two things can happen: the brick floor heaves upward or the flat bottom begin to bulge. In the pump tank pictured here, the bottom has begun to bulge causing the edges of the pump tank to lift off the support grillage.
Acid that has penetrated the wall lining will attack the carbon steel shell and form sulphate between the shell and brick. The pressure that builds up usually cannot push the bricks out because they are in compression. The only release for the pressure build up is to cause the carbon steel shell to bulge outwards as seen in the picture.