Hydraulic submersible pump

[doobin]

Hi all,

Got a small pond to pump out so investing in a hydraulic submersible pump. All the second hand ones seem to be 20l/min. Both my powerpacks are 30l/m. Planning on connecting it to the mini digger and running it at quarter/half throttle.

Is there an easy way I can restrict the powerpack flow to 20 ish litres/minute? Will it matter too much if I put 30l/min throught it? It'll just spin faster surely.

 

[JD450A]

Hi all,

Got a small pond to pump out so investing in a hydraulic submersible pump. All the second hand ones seem to be 20l/min. Both my powerpacks are 30l/m. Planning on connecting it to the mini digger and running it at quarter/half throttle.

Is there an easy way I can restrict the powerpack flow to 20 ish litres/minute? Will it matter too much if I put 30l/min throught it? It'll just spin faster surely.

Will be fine running on your mini at low throttle. BUT get the flow return right or you will blow the seals

 

[V8Druid]

Will be fine running on your mini at low throttle. BUT get the flow return right or you will blow the seals

as in free to tank ... not through a valve block

 

[JD450A]

as in free to tank ... not through a valve block

Yes, But more so the Flow/Return side as in which way you pump the oil... they DO NOT like it the wrong way!

 

[V8Druid]

Yes, But more so the Flow/Return side as in which way you pump the oil... they DO NOT like it the wrong way!

i bet they don't ..... seals ain't designed to take that sort of pressure

 

[doobin]

I've already got all the flow/return pipes on all my powerpacks and diggers standardised.

 

[JD450A]

I've already got all the flow/return pipes on all my powerpacks and diggers standardised.

Be grand then....

My mistake was allowing someone to borrow it....

 

[GazCro]

Will they have anything on the inlet side to restrict flow?

 

[doobin]

Will they have anything on the inlet side to restrict flow?

I could add an inline restriction but not sure how you spec it to 20l amin or whether that would put stress on the power pack?

 

[V8Druid]

I could add an inline restriction but not sure how you spec it to 20l amin or whether that would put stress on the power pack?

certainly hot the oil up quick

 

[GazCro]

I could add an inline restriction but not sure how you spec it to 20l amin or whether that would put stress on the power pack?

Wouldn't do that i was just thinking if they have anything in built. Will powerpack be ok running constant cooling wise. Being designed for breakers they'll be expected to get a rest now and again.

 

[Shovelhands]

Put a 3 port flow control valve on the pump and plumb the T port of the valve into the return line. Once you establish the setting on the valve for the flow rate then it should be easy enough. Then you are not actually restricting the flow too much, just diverting some of it off to return.

 

[GazCro]

I doubt you'll have any bother running off powerpack tbh. At the end of the day max flow rate of 30l will be at low pressure. Probably find if you put gauges on you wouldn't get more than 20l through the pump when working with the pressure required anyway.

 

[V8Druid]

Put a 3 port flow control valve on the pump and plumb the T port of the valve into the return line. Once you establish the setting on the valve for the flow rate then it should be easy enough. Then you are not actually restricting the flow too much, just diverting some of it off to return.

had considered that but he has no way of assessing the flow ... could start at max divert and work backwards, but a bit hit and miss

 

[V8Druid]

I doubt you'll have any bother running off powerpack tbh. At the end of the day max flow rate of 30l will be at low pressure. Probably find if you put gauges on you wouldn't get more than 20l through the pump when working with the pressure required anyway.

gonna make a hell of a mess of the pond if he blows a seal though

 

[Shovelhands]

had considered that but he has no way of assessing the flow ... could start at max divert and work backwards, but a bit hit and miss

If you ordered one from a hydraulic specialist then they would no doubt set it up for you with a flow meter and either lock it off at the required setting or at least advise on the setting it needs to be to deliver the 20lm

 

[Monkeybusiness]

had considered that but he has no way of assessing the flow ... could start at max divert and work backwards, but a bit hit and miss

Couldn’t you just do it with a tap on the tee - close it off until pumping sufficiently? Only take a few seconds to set up.

 

[GazCro]

gonna make a hell of a mess of the pond if he blows a seal though

Pressure will blow the seals though not flow.

 

[GazCro]

Does your powerpack have to run flat out?

 

[V8Druid]

Pressure will blow the seals though not flow.

and pressure will build if the flow rate is too high to allow through flow of oil through the motor