3 replies to this topic

[Phenol]

Members,

 

We are installing a new cooling tower with associated circulation pumps.

 

The installation will have 5 pumps, vertical type of capacity 2800 M3/hour each.

 

The common discharge header from cooling tower to consuming end is by under ground piping

 

Due to space limitation we would like to keep the discharge piping of each pump as short as possible and route it immediately to the underground common discharge header.

 

Is there any restriction / design criteria to be considered before the discharge from each pump is connected to common under ground header ??

 

Also on the discharge whether any special type check valve to be used for 32 inch dia discharge piping from each pump (or double plate spring loaded, non slam type can be used ??)

 

Rajan

 

 

 

 

 

 

[fallah]

 

Is there any restriction / design criteria to be considered before the discharge from each pump is connected to common under ground header ??

 

Also on the discharge whether any special type check valve to be used for 32 inch dia discharge piping from each pump (or double plate spring loaded, non slam type can be used ??)

 

 

Phenol,

 

1) No specific restriction, just it's better keeping similarity in connection between pumps and common header

 

2) Non slam type should be used if there is the risk of surge due to water hammer
 

[Phenol]

Thanks Mr Naser Fallah.

 

Axial flow check valves are being discussed  against double plate non slam type.

 

But Axial flow valves are very costly. Hence my doubt.

 

When double plate check valves are available upto 60 inch size, i couldnt find reason for not considering that low cost alternative.

 

Phenol / Rajan

[rilmehta]

Yes, I agree that there is no limitations on the piping, only symmetric layout to be considered.