Hydraulic submersible pump

[V8Druid]

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

aye Flowfit'd probably be able to advise on theirs .. they have quite a range of 'em

 

[GazCro]

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

Yeah but that would mean the flow rate would drop. I know what you're saying I'm just wondering if it's that critical. The 20l pump is probably better designed for lower oil flow than a 30l but surely there's a bit of tolerance built in to deal with excess flow.

 

[V8Druid]

Yeah but that would mean the flow rate would drop. I know what you're saying I'm just wondering if it's that critical. The 20l pump is probably better designed for lower oil flow than a 30l but surely there's a bit of tolerance built in to deal with excess flow.

the flow rate exiting the motor'd drop ... but the pump'd still be trying to cram oil in there ... and summat has to give ... the spindle seal usually will pop out

 

[doobin]

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.

Nah, these pumps are designed to run off a powerpack- that's why the secondhand ones are all 20l/min as thats the normal Beaver type spec. All powerpacks have a fan and radiator built in.

 

[GazCro]

Nah, these pumps are designed to run off a powerpack- that's why the secondhand ones are all 20l/min as thats the normal Beaver type spec. All powerpacks have a fan and radiator built in.

So there's a fair chance that the normal beaver spec 20l is what people used to buy and the norm now is bigger version. If that's the case it would explain why there's second hand 20l pumps but no 30l for sale. If it's cheap enough to take a chance on have you got a plan b if it's packs in on the job. I'd be wary running if off digger hydraulics if you were thinking of it, relief valve in digger will probably set at a fair bit higher pressure than powerpack

 

[JD450A]

So there's a fair chance that the normal beaver spec 20l is what people used to buy and the norm now is bigger version. If that's the case it would explain why there's second hand 20l pumps but no 30l for sale. If it's cheap enough to take a chance on have you got a plan b if it's packs in on the job. I'd be wary running if off digger hydraulics if you were thinking of it, relief valve in digger will probably set at a fair bit higher pressure than powerpack

No disrespect. But you haven't run one and what your talking about doesn't make sense. There is a chart on jcbs spec sheet for anyone that doubts me but they are fine to run off a mini. The same as all the hydraulic hand tools.

20L flow rate is what is the optimum required to run the pump.

They will run perfectly happy on a mini excavator or even a 7 tonner provided they are setup right, the pipe size (1/4") will restrict the flow rate anyway.

R.E check valves, yes you can fit them to idiot proof.

Oil does heat up. But the pump is designed to be underwater (and thus cooled) and it's far less so than a breaker. A breaker heats oil far more than a motor as it is shock loading and restricting the flow to create liner motion from pressure.

Long story short doobin. It will work. Just make sure it's set up right. I can send you mine to try if your not in a rush but I will have to get on and reseal it.

R.e oil.... If they go they only leak a small amount. Oil ends up in the discharge as a small but visible sheen.

 

[Steve]

Would it not be easier to use a petrol driven water pump. This is a serious question from someone uneducated on hydraulic pumps.

 

[JD450A]

Would it not be easier to use a petrol driven water pump. This is a serious question from someone uneducated on hydraulic pumps.

Probably, but doobin likes hard work

Hydraulic pumps are capable of a higher head (pumping to height) than petrols and also move more water. Those are the advantages

 

[GazCro]

No disrespect. But you haven't run one and what your talking about doesn't make sense. There is a chart on jcbs spec sheet for anyone that doubts me but they are fine to run off a mini. The same as all the hydraulic hand tools.

20L flow rate is what is the optimum required to run the pump.

They will run perfectly happy on a mini excavator or even a 7 tonner provided they are setup right, the pipe size (1/4") will restrict the flow rate anyway.

R.E check valves, yes you can fit them to idiot proof.

Oil does heat up. But the pump is designed to be underwater (and thus cooled) and it's far less so than a breaker. A breaker heats oil far more than a motor as it is shock loading and restricting the flow to create liner motion from pressure.

Long story short doobin. It will work. Just make sure it's set up right. I can send you mine to try if your not in a rush but I will have to get on and reseal it.

R.e oil.... If they go they only leak a small amount. Oil ends up in the discharge as a small but visible sheen.

Fair enough no offence taken and you're right i haven't run one. Just got to hope the second hand ones out there aren't all in need of new seals.

 

[fred]

when i bought my jcb pump (the larger of the two) it can take upto 30L flow, so either the small or the large beaver pack. The large packs are pretty rare to find and are pretty much all diesel electric start not honda.

JCB Trash Pump | JCB Handheld Equipment | JCB.com

JCBs Durable Range Of Submersible Trash Pumps For Pumping Water With Mud, Leaves, Twigs, Sand, Sewage And Sludge In It.

www.jcb.com

It's a real beast 2.6cube a min full chat.

 

[JD450A]

That's the one thankyou Fred!

 

[doobin]

Yeah, seen all that, but both my two packs are 30 l/min (to run the hand held knocker we use) and theres only 20 l/m submersible pumps on the s/h market currently....

Would love a 4" trash pump but my budget won't stretch to new.

Actually flow rate of the water itself doesn't seem to vary much regardless of the larger motor.

 

[doobin]

Probably, but doobin likes hard work

Hydraulic pumps are capable of a higher head (pumping to height) than petrols and also move more water. Those are the advantages

Youre the one whos always going on about how good they are!! I like the idea of no faffing around priming, and there's always a digger on site anyhow.

 

[fred]

its more the solids that will go through them that differentiates them from cheap petrol 2" pumps. The small jcb was 30mm and large 70mm from memory. And for site work they can run dry without going bang when the labourer is on his phone and not watching as normal.

 

[JD450A]

Youre the one whos always going on about how good they are!! I like the idea of no faffing around priming, and there's always a digger on site anyhow.

They are lovely IMHO. Drop em and go.

 

[GazCro]

Priming wears thin after a few goes, especially if ur pumping a pond out. Deffo the way to go if you've already got a powerpack.

 

[Steve]

Priming wears thin after a few goes, especially if ur pumping a pond out. Deffo the way to go if you've already got a powerpack.

I was quite happy with my little honda pump until I came here, now I am going to have to get a hydraulic pump

 

[GazCro]

I was quite happy with my little honda pump until I came here, now I am going to have to get a hydraulic pump

I wouldn't worry mate I'm intending getting a lot of years out my Honda pump yet.

 

[doobin]

Well got her pumped down in around four hours combined with a 3” petrol pump. This hydraulic one should make it a piece of cake to get the rest out once I’ve got the fish out into a holding tank to clean them for slaughter
Got some fence posts to spread the weight and will dig a ramp in from the shallow side so as to get in a dig a sump.

 

[Monkeybusiness]

Next picture will be of an E10 roll-bar just visible sticking up out of the mud.....