Pump selection for water colection
Submitted: Monday, Mar 05, 2012 at 11:12
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Member - Beatit (QLD)
G'day guys,
I'm looking for a pump solution. We have always carted water in buckets when camping but the last couple of trips I've been spoilt by pumping into a water bladder which is just so much easier. I'm having some mods done to our vehicle and am looking for a 12v pump to be installed to suck out of creeks etc. I am looking for a unit that has the maximum reach and hight in keeping with my not wishing to cart with buckets.
The best solution this far is Flojet 4405-143 which permits 2m on the vertical and 10 meters away. Does anyone use a better solution?
Kind regards
Theo
Reply By: Member - Rob D (NSW) - Monday, Mar 05, 2012 at 17:55
Monday, Mar 05, 2012 at 17:55
Hi Theo,
I looked up the specification of the Flojet 4405-143 which states that the maximum output pressure is 35psi and that it self-primes up to 2.4m vertical lift.
35psi (approximately 2 times atmospheric pressure) corresponds to a vertical column of water approximately 20 metres high (using the approximation of 1 atmosphere equals 10 metres of water column).
This means that the pump in question needs to be no higher than 2.4 metres above the water you are pumping from. Further the total vertical height of the hose should be no more than 20 metres above the water you are pumping from, this includes the 2.4 metres to the pump.
You may want to put a filter on the inlet as I have had my pump clogged by sand and pieces of vegetation when I had no option but to pump from a shallow creek.
The 50psi pump recommended by Stan Pinko will pump up about an extra 10 metres in height.
AnswerID:
479552
Follow Up By: Member - bungarra (WA) - Monday, Mar 05, 2012 at 18:07
Monday, Mar 05, 2012 at 18:07
Rob
To clarify your post a little clearer. ( I havent looked up the performance charts) but using your figures and post above......
it may infer that the pump in question is performing
well at a total head of 20m (suction and delivery head) when in actual fact at a total of 20 m head the water may be barely dribbling out the end as at those heads the pump as at the end of its designed range
in other words it will have run out of pressure and delivery at those maximum delivery heads. 35psi delivery at whatever flow rate is specified... ( at the pump discharge outlet) ..and a significant less delivery rate at the other end of the spectrum.....low pressure and a dribble..
cheers
FollowupID:
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Follow Up By: Member - Rob D (NSW) - Monday, Mar 05, 2012 at 18:27
Monday, Mar 05, 2012 at 18:27
You are correct; at the maximum height the water will just be dribbling out. The entire pressure generated by the pump is just supporting the height of the water column.
So this means that if you want water flowing at a respectable rate then you will need to be pumping at a much lower level than the maximum water head.
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755021
Reply By: Member - Beatit (QLD) - Monday, Mar 05, 2012 at 20:39
Monday, Mar 05, 2012 at 20:39
Thanks guys, to coin a phrase it looks like a suck it and see! I was having a robust discussion (fight) with the bride on the various hights we have encountered. we never agree on much hahaha. one trip we bucketted from Crystal Ck on the way to Verilia Point, I felt it was under 2 meters from the log
bridge and she said it was more.
Domestically I know I'm wrong.
Kind regards
Theo
AnswerID:
479569
Reply By: rooster350 - Tuesday, Mar 06, 2012 at 10:01
Tuesday, Mar 06, 2012 at 10:01
We have a small 12v Flojet type pump, it is in a wooden box with a 40ah deep cycle battery , a 400mah solar panel sits on top of the box at a 45 degree angle and pointing north. 10m of air hose from from water to pump and 20M of air hose from pump to tap at
camp site...lifts water up to about 2m or so o.k , fills a 9l bucket in about 1.5 minutes....we set it up and forget it , battery never goes flat.
AnswerID:
479602