Cooling Water Return Pressure of H/E

[Nickchen007]

Most of engineer told me that the pressure of cooling water return pressure should not be too low (generally higher than 1BarG).I believe it is correct, but I don't know why, can anyone tell me.

 

[Chance17]

In a broad sense, I can not think of any reason to purposely increase cooling water return pressure.
The impact would be to add restrictions and limit circulation flow.

I once work at a unit that experienced a tube rupture.
The cooling tower basis filled with Styrene.

Someone in the process business may have a practice to elevated return header pressures to direct fluid flow in event of tube failure.
But I have never heard of this practice.

Cant' think of any other reasons

 

[SNORGY]

If you are coming back to an evaporative cooling tower, you need enough head to get up the risers and to the flow distribution valves with enough back-pressure so that you can properly balance the flow across the top of the tower.

Regards,

SNORGY.

 

[Latexman]

Besides getting back to the tower, you also want enough pressure so at the highest/hottest CW return point it doesn't boil, go 2 phase, and when it comes to a lower/colder point it water hammers. CW return risers have been known to run at a vacuum!

Good luck,
Latexman