Centrifugal pump operating conditions

[RomanKatz]

Hello,

I really need your help:

I have a liquid filling machine that produces coolant fluid. the centrifugal pump (its parameters i can provide) sucks the liquid from the bottom of an IBC container. the bottom of the IBC is more or less at the same hight as the pump.
this is a small batch system that is not very operational since the demand is high for the coolant fluid.

Therefore a tank was constructed[4m3]. when it is full, the liquid level is 4 meters above the pump.

My worry is that because of the big hight difference the liquid pressure will over-flud the pump even if it is not operating and the liquid will pour out of the machine without any control.

I havent tested the tank yet, so my question is what do i need to do in order to know will the pump hold the pressure or not?

Thanks very much.

 

[LittleInch]

First please sketch your system in profile and add any valves.

Its not clear what your pump connects to.

If its an open end, then without valves, if the liquid level in the tank is higher than the outlet, a centrifugal pump will let flow through.

You might need a simple pressure control valve to stop flow when the pump isn't running.

Not quite enough info to say any more.

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[RomanKatz]

see attached a scetch of the process.

The pump is connected the the tank, by a valve. its is a open end pump since its outlet fills the bottles directly.

 

[LittleInch]

You might not needs the pump at all. You will need to control flow using valves, not the pump. There is no such thing as "over flood", only process conditions.

To repeat, centrifugal pumps will not "hold" pressure.They might provide some resistance to moving how, but not a static flow.

Does this help?

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Also: If you get a response it's polite to respond to it.

 

[RomanKatz]

Thanks, that helps to know that i have a problem. The pump is a part of the machine i cant take it out.

 

[LittleInch]

Can't you just use a valved dispenser? i.e. like a petrol pump.

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Also: If you get a response it's polite to respond to it.

 

[RomanKatz]

The pump that i have is exactly that! a valved dispenser. How ever since the the head of the liquid in the tank is high, the liquid will flow throught the pump even if it is not operational.

I was thinking about placing additional vavles between the tank and the pump. it is the easiest thing i can do. not sure if it will work.

 

[LittleInch]

So if it is a valved dispenser, why can't it cope with the minimal increase in inlet pressure when the pump isn't running? Can you post some details of the valved bit or the name of it.

I think you might be seeing problems where none exist, but without details it is not easy to say much more.

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Also: If you get a response it's polite to respond to it.

 

[RomanKatz]

See attached several pics.

They are not great but this is the best I could do.

Best Regards
Roman Katz

 

[RomanKatz]

One more pic.

Best Regards
Roman Katz

 

[RomanKatz]

Pump pic.

Best Regards
Roman Katz

 

[LittleInch]

Nice small pump, but the bit we're interested in now is the valved dispenser. I can only see three pics of the pump.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.