3 replies to this topic

[mm217]

Dear All,

I get totally confused. This annoys me that I have still too many questions about pumps 
Is anyone could help me to fully understand the vertical type pumps?
We have following vertical types: 
1. Submersible (Submerged?) pumps which is installed in the tank. The motor is out of the water. The shaft of the pump is long enough to cover the depth. The NPSHA calculation is required for this type (?)
2. Submersible? Pumps which is installed in the tank and motor is in the water. It is used to evacuation. No NPSHA calculation is need (?!)
3. Multistage vertical pump (is this the same as “in-line”?) which is out of the tank. The suction line from the tank is connected to pump suction nozzle. The NPSHA calculation is done as usual. What is the difference between this type and horizontal type? Why should we select this type instead of ordinary horizontal type to transfer liquid from the tank to destination point?
MM217

[chemproc]

MM 217, 

 

The answer to the last part of your questions are as follows:

 

What is the difference between this type and horizontal type? 

 

Answer: Vertical pumps have lower NPSH required than horizontal pumps.

 

 Why should we select this type instead of ordinary horizontal type to transfer liquid from the tank to destination point?

 

Answer: When your tank cannot be raised any higher to give you more head, you do not want to increase pipe size

 

between the tank and the pump and you have insufficient NPSH required, vertical pump is the way to go.

[mm217]

MM 217, 

 

The answer to the last part of your questions are as follows:

 

What is the difference between this type and horizontal type? 

 

Answer: Vertical pumps have lower NPSH required than horizontal pumps.

 

 Why should we select this type instead of ordinary horizontal type to transfer liquid from the tank to destination point?

 

Answer: When your tank cannot be raised any higher to give you more head, you do not want to increase pipe size

 

between the tank and the pump and you have insufficient NPSH required, vertical pump is the way to go.

Thanks  edusegzy1.

Can you guide me in difference between item 1 & 2 ?

 

mm217

[breizh]

http://centrifugalpu...l_vertical.html

 

Consider this resource

 

Breizh