5 replies to this topic

[CMEngineer]

Hi All,

I just have an enquiry about a pressure drop calculation.
I was wondering is there anyway I could calculate the outlet pressure of the pump without having to physically measure it with a gage.
I have the pump inlet pressure and flow, and the pump outlet flow. I also have temperatures.

Thanks for your help,

Cara

[mrj]

Cara,

I believe it is a centrigugal pump. Get the pump characterstics curve and you can find the outlet pressure of the pump.

If the pump discharge is going to column or tank then you can easily get the discharge pressure by adding the vertcal head and pressure drop.

mrj

[kuldeepd]

http://www.processca...r.com/Pump.aspx

hope this helps.

regards
KD

[ARAZA]

HI,

Is it an existing installation?? If yes, the pressure on the gage would be more accurate rather than trying to calculate.

If it an new installation, then follow the logical steps in calculating the pump dynamic head by adding total static and dynamic head.

Let me know if you need more info.

ARAZA

Hi All,

I just have an enquiry about a pressure drop calculation.
I was wondering is there anyway I could calculate the outlet pressure of the pump without having to physically measure it with a gage.
I have the pump inlet pressure and flow, and the pump outlet flow. I also have temperatures.

Thanks for your help,

Cara

[Teknas]

Hi Cara,

The most obvious answer to your query would be to check the pump curve and determine the head developed at your existing flowrate.

The above solution holds true if :

1. Its an existing pump with the pump curve available.
2. You have placed order for the pump, in which case you can ask for the characteristic
curve from the vendor.
3. Your pump is at the bid evaluation stage. The vendor will be able to supply you with the
pump curve.

But, I think that you already know these answers.

If there is something more to your query, than what meets the eye, please elaborate.

Sanket

[Nageswar Kotari]

Hi all,
Here is my data

Capacity:- 264m3/hr
Diff.Head :- 75m
NPSHr:- 1.95m
Efficiency:- 69.9%

The available head is 8m

when i calculate the discharge pressure it is around 6.8bar

but the pump data sheet states that the discharge pressure is 7.1bar
and also one more column in pump data sheet is stating that Diff. Pressure is 6.81bar

what is exact disharge pressure now? can some one help me out. sorry cara i had used your issue.

Hi Cara,

The most obvious answer to your query would be to check the pump curve and determine the head developed at your existing flowrate.

The above solution holds true if :

1. Its an existing pump with the pump curve available.
2. You have placed order for the pump, in which case you can ask for the characteristic
curve from the vendor.
3. Your pump is at the bid evaluation stage. The vendor will be able to supply you with the
pump curve.

But, I think that you already know these answers.

If there is something more to your query, than what meets the eye, please elaborate.

Sanket