Good afternoon,i have a 1000ltr ibc full of rainwater and i want to water my allotment but the pressure from the hose is pitifull,i do have a generator which is a honda driven which says 220 on the side.Can anyone advise on what size water pump i should buy to be able to get a reasonable pressure?,as always,tiagonsesen
3 bar 50litre/min should be ample (I have one in my domestic H&C system)
JimK
sorry to be a thicko but i don't understand what 3 bar means,
it will be written on the pumps
google is your friend...........
JimK wibbled on Saturday 17 April 2010 13:09
From when I was testing my house supply, the most you'll get through a 1/2" hose is about 15-20 l/min at 4-5 bar (I used a hose to test the drains I'd constructed).
55l/m is what I get through the 1/2" supply pipe at 7.5 bar :)
Biggest fiddle might be making connection to the container. Assuming the pump and genny are next to the container, and you don't have more than about
30 metres of hose something like this should be fine
spose it depends on how long/convoluted your hose is? pressure vs flow etc
aye, 50l/min was what my pump was sized for to backwash a pH filter through 1" pipework. Through the taps of course I don't see that throughput (thankfully for hot water!!)
CHeers JimK
Metric measure of pressure. 1 bar = 14.5 p.s.i.
bob wibbled on Saturday 17 April 2010 13:59
Pressure - 1 Atmosphere is more or less 1 bar.
Remember when weather forcasts said "it is 1008 millibars over London tonight..."?
JimK wibbled on Saturday 17 April 2010 15:50
Of course :) This was "typical smooth bore garden hose" in a "typical garden hose length". I had to use 3 hoses all tapped off 22mm pipe to get the full flow of 50+l/min (I was testing a sink, dishwasher and washing machine drain point I'd just laid in, all fed off the same 50mm waste pipe, to make sure I couldn't overload them or their u-traps.
FX whistle through teeth /FX
50 l/min thru 22mm AND 3 hose pipe adaptors??:>) Cheers JimK
Three times atmospheric pressure. Personally I would double that. Six bar will provide a decent squirt out of the hose.
R220 volts. That tells you nothing about the power output. How big is the motor? Can you estimate the horsepower and/or wattage? 750 watts is equivalent to one horsepower. You will not get much more than 60% of the motor power converted to water power. You should be able to buy a single stage radial flow pump that will operate on single phase power. Radial flow pumps will give more pressure and less flow while axial flow pumps give more flow at less pressure. R
I think Tim had them running in parallel. Never one to do things by halves ;-)
Chris
The OP wants to water his plants not pressure wash 'em. B-)
Our outside tap has less than 30' head (approx 1 bar) and is fed by a long and complex bit of 15mm pipe. It's flow/pressure is only just too low. Something around 2 or 3 bar would be fine.
Chris J Dixon wibbled on Sunday 18 April 2010 07:21
Yes - quick lash up with a bit of speedfit.
I wanted to measure the flow rate out of my new incomer head end (Pressure Reducer Valve and 22mm full bore c*ck being fed by underground 1/2" alkathene. Bit of 22mm pipe bent into a 60l builders bucket and times showed 55l/min despite the pressure valve being set anywhere down to 4 bar (that's a good thing)
Then I stuck 3 hoses on and pointed them down the kitchen drains which are nearby to test that that could handle the flow. I had to bend a few rules to get my drains to work so I thought it prudent to trial them. They worked with some spare, so there's no way a sink and two machines can cause any blowback even if they all discharge together.
that's some bucket :>)
JimK
If we're talking allotments then a skip-grade CH circulator (aka central heating pump) would do nicely. Keep skip-diving for replacements when they eventually pack up. Or ask a friendly plumbing & heating installer for old but working ones taken out when they replace boilers.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.