Reducing 15.0KSCG to 5.0KSCG

[patrickraj]

Dear friends,

I have a urea solution pump(135 deg c) that develops 15Kscg pressure and 15M3 flow. I want to use this pump for 5.0Kscg pressure and 15M3 flow(135 deg c). How I can control the pressure(In the new application 15 kscg pressure is not acceptable).Restriction orifice will help.

Thanks in advance.

 

[samy1234]

hi, what type of pump your using to pump urea solution?

 

[patrickraj]

Dear samy1234,

Pump is of horizontal centrifugal pump

 

[TD2K]

You could of course use a control valve to decrease the pressure to the 5 kg/cm2 that you need. But that means you are wasting the energy you just put into the fluid via your pump.

Can you put a smaller impeller in the pump? I'd also take a look at the BEP versus your 15 m3/hr (I'm assuming the time units are per hour) to ensure that you aren't operating too far away from it.

If you use a control valve, you'll need to consider if the valve goes fully open and puts the full 15 kg/cm2 on your downstream process, does that introduce any overpressure issues?

 

[patrickraj]

Dear TD2K,
Thanks.
There is no overpressure issue.
YOU are correct. Flow unit is M3/Hr.
Urea solution is to be lifted to 52 feet elevation, there I want to maintain 1.5-2.0Kscg Pressure only.
No availability of smaller size impeller.

Your views will be very much appreciated

 

[viscose]

dear patrickraj
Any centrifugal pump in general changes its capacity with head. you send me the chareterastics curves. But i think it will be economical to change the pump with required capacity and head. it will pay back in less than ayear
VISCOSE

 

[patrickraj]

Dear viscose,

Sorry sir.
I do not have pump curve right now.
We are trying to use a pump from a closed down plant of somebody else.
I have written to them in this regard.

Thanks

 

[samy1234]

BEST TO BUY NEW PUMP.OTHERWISE YOU NEED COSTLY MODIFICATION TO BE CARRIED OUT BY PUTING PRESSURE CONTROL VALVE (RETURN BACK TO SUCTION LINE)