r/ChemicalEngineering • u/Trigathoras69 • May 25 '25
Design Chemical dosing for cooling tower water
Hello guys, junior engineer here. I was given the task to install a control panel to inject chemicals for cooling tower water and design the suitable piping pathway and where should the chemicals be injected into the cooling tower system. I was thinking of just directly inject the chemicals into the cooling tower basin, but since the cooled water in the basin is stagnant, im afraid the chemicals will not mix well inside the basin. My supervisor suggested do the piping to that the chemicals are injected into the header at recirculation pump discharge side. The constraint with this idea is that the header is made of stainless steel, and the chemical piping is PVC. I would like to ask for any ideas or comment from you guys, especially for those who are working with cooling tower. Is there any industry standard on how to inject the chemicals into the cooling tower system?
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u/asscrackbanditz May 25 '25 edited May 25 '25
You can contact your local Nalco, Kurita, Veolia rep. They will be more than happy to feed you information if they want to make the buck.
They are cooling tower water treatment specialist vendors. They have their own proprietary chemical. They may engage 3rd party subcon to do the actual set up but they will recommend the suitable dosing system design including dosing point and pump/controller. When you call them up, they will ask you to give information like total treatment volume e.g basin volume, pipe volume, pipe size, pipe material, water quality, cooling tower application, make up water source, etc. They will then give a proposal including where is ideal to dose the chemical.
Anyway, for control panel, Walchem is a decent one. Nalco has their own 3D Trasar as well. You can go through different proposal then make your call.