Rainwater Tank With a Pump?

[Metal Head]

Hi,

Can you please tell me what the normal water pressure is from a domestic household tap?.

The reason I am asking is to find out what size electrical (240V) water pump would I require to be attached to our rainwater tank to water the garden (via a hose - thus domestic pressure) as well as for other situations i.e. using the electrical tile cutter;).

If it is possible, what size and brand of pump would you recommend?.

Thanking those in advance of their replies.

Kindest regards
David

[doug1]

Pumps are often described in terms of taps they will drive, the one I have will drive 4.
mine came with the tank from bushman and has been connected with 25mm plastic pressure pipe and quarter turn ball valves.

pump auto starts is about 600W I think

Doug

[echnidna]

I've got the smallest Grundflos on the machinery shed and its capable of watering the garden and hosing things down.

[woodsprite]

Normal household pressure can vary a fair bit - in our area about 32 to 35 psi is the norm.
Jeff

[Skew ChiDAMN!!]

You can get away with a surprisingly small pump if you have it feeding a header tank instead, with switching controlled by a float valve. Height of the header tank determines hose pressure.

Having the takeoff mounted an inch or two above the bottom of the tank will mean it doesn't need to be a self-priming pump, as it'll always be primed. Errrmm... provided that when first installed you "prime" it by filling the header with a bucket!

[MurrayD99]

We are on a county water supply and have a pump and pressure cylinder unit to provide "mains pressure" of the 1000 gallon tank that is up on a stand. The pressure cylinder isn't very big - I guss as big as a 13" portable tv - and it has a bladder filled with compressed air inside. This is pressurised to about 40psi. Does the whole house, garden, stock troughs etc... I think the motor is about 2hp. Pump is Italian make I think.

[keith53]

I've got the smallest Grundflos on the machinery shed and its capable of watering the garden and hosing things down.

Same here. Works well. Three impellers, electronic auto start (detects water flow) & I think cost around $450.

[Buzzer]

Hi Metalhead,

If you can find a good pump retailer they will be able to advise you on the size of pump.

I am on a cattle property and I have found Davey to be a good system, with a good parts back-up. Nearly every pump shop stock Davey pumps and parts.

My next choice would be Grundfos. I have found their bore pumps good and reliable, both for stock water and irrigation use, due to their stainless steel construction.

Cheers
Buzzer

[jimc]

in last autumns? copy of renew magazine, there was a cehap method of adding a small cehap pump to a water tank to provide enough pressue to water though a hose.

The total cost was less than $100 and was based on either a sludge or water fountain pump I think. There was comments that the pump lasts 1 - 3 seasons before it dies.

If you want I will attempt to track down the issue number.

I am planning on building one for this summer.