what size 12v sprayer pump?

exmoor dave

Member
Location
exmoor, uk
I'm in the process of converting a old hardi sprayer into a trailed sprayer. Mainly just to hit the patches of creeping thisles &nettles.

It has a 300lt tank. 6m boom. Did have 12 nossles.
But doesn't have any pipe work, pump, valves etc etc. Just a tank and boom at the mo. So if it all looks abit expensive I'm still at the "at least it can be a water browser" stage.

At the stage of getting it piped etc but will need a 12v pump. But what size will I need?

Research suggests pumps are available from 4lt/m - 20 lt /m

TIA

20130610_082531.jpg
 
Location
Cheshire
Boom looks 4 metres ish wide, nozzle spacing of 40cm gives 10 nozzles ish, nozzle output is going to be 1litre per minute ish which requires 10 litres per minute ish pump.
You rarely fit a pump and think you wished you had gone smaller, you often wish for a bigger one though.

Roller vane if pto is available petrol powered if on a quad would be something I would be considering with those booms. 12V are OK but they don't last long if you put them on their limit constantly. Better suited to spot spraying IMO.

Used chemical sprayer as a water bowser?
For filling a knapsack rather than a drinker I hope.
 

exmoor dave

Member
Location
exmoor, uk
Apple squasher, think you might have looked at the photo more than the writing ;)
Its a 6m boom with 12 nossles.
So by your reckoning adjusted for 12nossles, a 12lt/m or 15lt/m pump would be sufficient. But a 20 lt/m not working so hard will last longer?

How much difference will nossles type and size make to the pumping capacity needed?

No PTO pump. Building it to pull behind landrover etc. Opting for 12v for convenience and cheapness. Not wanting to spend mega money on it as you can get small sprayers from northern tool etc for alright money. But seems a waste of a tidy tank and straight boom. Will be putting a hand lance and pipe reel on as well.

Yep water bowser for the knapsack.
 

stroller

Member
Arable Farmer
Location
Somerset UK
Put 2 pumps on, one doing each half, that way you can switch off half your boom. Will you have enough oomph from the l/rover electrics? (and just use 1 pump for the hand lance with a couple of extra taps)
 

neilo

Member
Mixed Farmer
Location
Montgomeryshire
What about using the pump from that old hand sprayer sat next to it, powered by a small child? The drawbar looks long enough to fit a seat on it for them, if you are feeling particularly kind.:)

I like Stroller's idea about twin pumps, and I was wondering the same about the electrics. Some quads struggle to run smaller sprayer pumps. Maybe a small petrol engine & an old sprayer pump (was there one on the Hardi?) might be the way to go? Or a treadmill & dynamo for the child?
 
Nozzle size is very important when choosing pump output. Lets say you use Red 04's, they have a flowrate of 1.6l/m @ 3 bar. So 1.6 x 12 = 19.2 l/m flow, then you need to factor in excess flow for agitation (10%) is sufficient) and you end up with 21.12 l/min pump needed.
If you need any assistance regarding this, I am more than willing to help and quote your for the right pump for your needs.

PM me if you'd like me too

Neil
 
Location
Cheshire
Have to admit I was too busy admiring your shed to read the writing properly.
I can see how far you have got but when I was after a similar sprayer to what you have, I really struggled to find anything under £1k that was useable. That gives an idea of its worth.
A ready made thing from Northern Tools plus a boomless nozzle would give enough change for a belting weekend away. ;)
 

exmoor dave

Member
Location
exmoor, uk
Some further research suggests that what I'm trying to do isn't really going to be possible.

Just looked up a equivalent tractor sprayer to what our old hardi was. Their operating on 120lt /m PTO pumps! o_O

Ok second idea. In northern tool you can buy a "broadcast nozzle". 4.8 m spray width. Needs a pump of min 5lt m. Anyone know much bout such a thing?

My concern would be spray drift from such a thing?
 

stroller

Member
Arable Farmer
Location
Somerset UK
I have a small sprayer with a North Star 2.2gpm (US?) 70psi 12v pump, this will pump out enough to use 5x 04 guardian air nozzles, but I now use 03 instead, which will give about 100l/ha depending on the speed I drive. I don't worry too much about agitation, driving around will shake it up enough, I have used round up and mcpa etc in it with no problems, but if you start using powders and tank mixes etc you might get some settlement. I can't see why twin pumps won't work providing you can get enough electric to them.
 
First of all you could easily achieve what you want providing you don't want to use huge nozzles, for example I could supply you with a 26.5 l/min 12 volt pump (28 amps) for little over £200 and secondly @rob1 the higher the flow/pressure the better with something like that as you need highish pressure for obvious reasons and the flow to simply flood and flush.

All achievable, just drop me a PM

Neil
 

neilo

Member
Mixed Farmer
Location
Montgomeryshire
Ok second idea. In northern tool you can buy a "broadcast nozzle". 4.8 m spray width. Needs a pump of min 5lt m. Anyone know much bout such a thing?

My concern would be spray drift from such a thing?

I have boomless nozzles on a quad, spraying to 15'. There is little drift, probably less than with 'proper' boom/nozzles, as the droplet size is quite large. However, where I used it for Thistlex & Pastor last year, there was significant regrowth after spraying last year. Where I used the same chems through a 'proper' sprayer, they have worked incredibly well. I think the large droplet size meant that I didn't get enough active ingredient into the plants and I won't bother with the boomless nozzles again. If you want to give them a try, send me a PM.:)

On a tangent, and thinking about your handheld sprayer again, would I be feasible to pressurise the whole tank with a small 12v compressor? Would the tank be strong enough, I wonder? Just pressurise the tank to 3 bar (or whatever) and have a tap/solenoid for switching the boom/boom section on or off? We built a simple slurry 'fart pump' that worked on that basis and it worked for many years until rust got the better of it. :)
 

exmoor dave

Member
Location
exmoor, uk
Thanks neilo.
After spking to simperstradecounter I think I'll go ahead and try my original idea. Rigged up on the old landrover incase I blow the electrics.

I can always run less nozzles if the boom is to wide. Plus I'll at least have a meaty spot sprayer at the end of it if nothing else.

Dad's toying with the idea of a "proper" sprayer but it will end up out our other farm and when I think "oh winds stopped for once, think I'll hit some thisle patches", it will be 15mile away. Plus I'm a liability on a tractor, hence small sprayer on the landrover would be ideal :)
 

exmoor dave

Member
Location
exmoor, uk
Finished article

Many thanks to @SimpersTradeCounter for advice and supplying the bulk of the parts.

Took out for a spin last week. Bit of boom spraying but mostly spot spraying. Had it going most of the day on a hot day and the pump didn't even get hot.

Using the hose reel is certainly much better than pumping a knapsack all day!

20130718_093753.jpg



20130718_135934.jpg


Tip: garden hose fittings fit on the lance so I can swop lances easily (I have a few).

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Boom wants moving higher. But I am toying with the idea of doing away with the wheels and draw bar and slide the whole thing in the back of the landrover.
 

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