6 replies to this topic

[hammy1554]

If the pump discharge is 12 barg , line size 2"and if we connect 12 barg gasoline to 0.5 barg vessel(Big volume 700 M3)does it require pressure reduction a Pressure controller. or it is okay of discharge 12 barg to this low pressure vessel?

 

[breizh]

Hi,

More information are needed !

Can you share a PID or at least a simple PFD ?  What is he distance from the pump to the vessel ? what about the altimetry ?

Why do you need 12 barg at the discharge of the pump ? What is the technology of the pump ? what about the flow rate ? how the product enters the tank ,on the top or at the bottom , for us to evaluate the pressure at the discharge of the line ?

What about the design of the vent on the tank ?

Etc …..

 

You need to initiate a process change and ask your management team to review it . 

 

 

Good luck

Breizh

Edited by breizh, 07 July 2020 - 08:32 PM.

[Chemitofreak]

 

If the pump discharge is 12 barg , line size 2"and if we connect 12 barg gasoline to 0.5 barg vessel(Big volume 700 M3)does it require pressure reduction a Pressure controller. or it is okay of discharge 12 barg to this low pressure vessel?

 

 

 

What type of pump is in service.

[fallah]

 

If the pump discharge is 12 barg , line size 2"and if we connect 12 barg gasoline to 0.5 barg vessel(Big volume 700 M3)does it require pressure reduction a Pressure controller. or it is okay of discharge 12 barg to this low pressure vessel?

 

hammy,

 

If the pressure of the tank is 0.5 barg then the discharge pressure would be the 0.5 barg+liquid static head between the pump discharge nozzle+the friction loss along the discharge line...

If you are going to keep the pump discharge pressure at 12 barg and above mentioned estimated pressure is lower than 12 barg; then you need to apply pressure reduction facility...

[Jiten_process]

Just a small additional point following to fallah's accurate explaination, if you dont provide the PRV (pressure reduction valve or a control valve) in the scenario fallah has described, pump will run on its curve as per the available system resistance, most probably in your case, to end of a curve. And you may see consequences of running a pump at end of the curve (e.g. NPSH, power, vibration etc) if your system is not designed for that. So its always recommended to provide PRV on pumping system discharge to control the pump to its duty point in case of varying flow and so the varying system resistance. 

[fallah]

Just a small additional point following to fallah's accurate explaination, if you dont provide the PRV (pressure reduction valve or a control valve) in the scenario fallah has described, pump will run on its curve as per the available system resistance, most probably in your case, to end of a curve. And you may see consequences of running a pump at end of the curve (e.g. NPSH, power, vibration etc) if your system is not designed for that. So its always recommended to provide PRV on pumping system discharge to control the pump to its duty point in case of varying flow and so the varying system resistance. 

 

Agreed,

 

Thanks for your additional explanations...

[Prakashdesai]

Thanks for the information.