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RO water suitable for Mild steel?

September 18, 2010

We have RO plant. We have 2 circuits and water for both the circuits is from RO plant.

The primary circuit is a closed recirculation system and it is used for Cooling our Furnace shell/Base and Furnace electrodes. Our Furnace is Melting furnace and electrode type is Electric Arc. The water lines are Mild Steel, pressure in the water line is 5 Kg/cm2 and the flow rate will be 4 - 5 Cu. m/hr.
The temperature difference between the incoming and outgoing water of the furnace is between 5 - 7 Deg C and outgoing water never exceeds 50 °C.

The secondary circuit is for the cooling tower and the primary water is cooled by the secondary water through Heat Exchanger.

We would like to know
1. What should be water parameter for this type of application and whether RO is a suitable for this application.
2. What can be the causes for the corrosion and puncturing of the primary lines

Arvind Saxena
employee - Ahmedabad, India

RO water is a good choice for this application provided that the pH is maintained slightly alkaline to prevent corrosion. RO permeate is often slightly acidic and so is corrosive to mild steel, brass and copper.

Companies that supply boiler and cooling tower chemicals, can also provide corrosion inhibitors and biocides if they are needed.

Lyle Kirman
consultant - Cleveland Heights, Ohio
September 21, 2010

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