Demin. Water Storage Tank - Top or Bottom Inlet?

[InDaPass]

I am building a new demineralized water tank to supplement an existing tank. The existing tank has the inlet at the top. Going into the top of the tank increases cost by adding a long stainless steel riser to the top of the tank. Are there good process reasons for doing this?The tanks will be fed by ion exchange demineralizer trains. Is it beneficial to have constant back pressure on the demin. trains? Are there other reasons for placing the inlet at the top of the tank? The two tanks will have separate inlet headers which are not hydraulically linked.

 

[BigInch]

Of course it naturally eliminates flow reversing from the tank back into the inlet lines and the check valve that would be required to do so, if the entry point was below the tank's fluid level. I can't answer for the demin process, however hydraulically speaking constant pressure is almost always the preferable method of operation.

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[bimr]

It really does not matter. There is no reason to have a back pressure on the demineralizer system. When the demineralizer system shuts down, the demineralizer valves should also shut off.