1. Please arrange the linear ...

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1. Please arrange the linear velocity in HE in 3-5 feet/second. 

2. Check material construction of the sysrtem.

3. Check it the minimum temperatures in the cooler/chiller.

4. You use Nitrite Program add with Borate as for pH buffering  with control 1500-2500 ppm. And pH in 9 - 10 in range. If the Material Construction has aluminum alloy the PH control in 7.5-8.5.

5. The superior is with Molybdenum the control MoO4 will in range 150-250 ppm as MoO4.

If the system has copper alloy the program must add with Azole compound. 

Usually the program provided with anti scalant, especially for high temperature in close  loop syste.

Usually the corrosion rate mild steel, with Nitrite: 3.5-4.1 mpy.

For MoO4, the corrosion rate will