Multiple cooling Tower equalization issue

[BronYrAur]

I have 3 cooling towers with an equalizer line connecting them. I have noticed a condition when 2 of the 3 are running. I looked inside the 2 running towers and noticed that the water level was normal and that no water was being made up. I then looked in the tower that was not running and noticed the the water level was below the normal line and the makeup water valve was full-open trying to fill it. Any thoughts on what is going on here?

 

[LittleInch]

Please draw a diagram.

 

[Btutiful]

A diagram would be helpful. Is the equalizer line sized large enough? Depending on how the system is setup, I could see that being a possible issue.

 

[goutam_freelance]

What are the flow situations inside the running cooling towers and standby cooling towers? Was the performance of CT normal? CT basin Level normal can mean that the make-up control is running normally.

 

[LittleInch]

A big leak in the non working basin?