Heated Polypropylene Acid Passivation and Rinse Tanks
Application for Heated Polypropylene Acid Passivation and Rinse Tanks
Recently Best Technology was contacted by a customer who manufactures and installs stainless steel piping into underground water distribution systems. Once buried, the pipes need to have a very long life. The customer uses stainless steel fittings and junction pieces throughout their buried systems. The fact that the parts are stainless steel gives them much long life than similar parts fabricated from mild steel. However, even stainless steel will rust over time – especially when buried underground. One solution that will greatly enhance the life-span of the parts is to passivate them.
The customer already had a system in place to clean the parts, but needed to add the ability to passivate their parts after they were washed. These parts tend to be large and irregularly shaped. The customer needed a system large enough to handle the variously shaped parts, but also needed to be mindful of costs.
The answer was to fabricate a two-tank passivate and rinse system using polypropylene tanks. The poly (polypropylene) tanks are less expensive than steel tanks yet still offer the ruggedness needed for daily usage in a plant floor environment. est Technology was able to fabricate the polypropylene tanks and add custom controls for heating the solution (heat speeds the passivation process) and circulate the citric based solution to insure both a continuous flow of the solution around and through the parts and maintain a uniform temperature of the solution in all parts of the tanks.