pump head height

[Cossack1977]

Before some smart ask says it yes i did a search, but do i need to remind anyone how bad the search engine is!

what i need to know is what does it mean by head height on a pump?

i know that say a pump is 3500lph that that is @ 0 head height but what does it mean when it says max head height 4.5m.

 

[Walt]

'Max Head' refers to the very highest level to which a pump can raise water. At a pump's max head, it will yeild only a fraction of the flow and will not be adequate...
So in your case, it wont pump any higher then about 4.5m.....

 

[Opcn]

When you pump water up it creats back presure and the pump has to work against it.

 

[Cossack1977]

When you pump water up it creats back presure and the pump has to work against it.

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so back pressure as in friction?

i had 2 resun pumps the sp9000 3500l/ph max head 4.5m running on a custom filtration setup that i was working on for my 180 gallon (one pushing the water at start of filter system and one pulling at end of filter system). when the pre-filter was newly cleaned id get massives amounts of water flow but after about 14hrs there would only be a trickle. I spoke to to the place i got the pre-filter (it a agricuturel filter) and they said that 3500l/ph would be more then sufficient and that on the irrigation setups they do these pre filters should give them over 6mths before needing a clean. ( that taking water from a dam, which i think would be dirtier then my fish tank)

What im thinking is the pump's just dont have enough guts to cope with the friction of the filter getting dirty.

Can i assume this would be similar to say max head height. That more head height the better?

i am looking at using a comercial water pump instead of the 2 resuns. its a 1hp/750w with a max flow of 55 l/min (3300l/ph) max head: 55meters and max suction 9 meters and thoughts?

Any other suggestions or pump ideas would be appreciated.

 

[Opcn]

friction is one source of backpresure yes. A running line will inhibit flow some, but vertical distance is the biggest issue.

 

[Cossack1977]

friction is one source of backpresure yes. A running line will inhibit flow some, but vertical distance is the biggest issue.

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the current pumps wouldnt be pushing more then 1 metre in height.

hmm

im stuck and would love some sugestions

 

[Opcn]

it will still work, so long as its not 4.5M. However it wont be as high a flow rate as the maximum flow rate on the pump. it will probably e about 5-10% lower at 1M head hight

 

[Cossack1977]

it will still work, so long as its not 4.5M. However it wont be as high a flow rate as the maximum flow rate on the pump. it will probably e about 5-10% lower at 1M head hight

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im losing to much flow thouth the filters.
Spoke to a lanscape garderner that does alot of ponds and irrigation settings and what he told me was head height was like torque in a car more torque easier to hold water flow. looking at my pumps he said they would flow about 2600 l/ph @ 1 metre head height. which is fine but they lose about 1600l/ph through the filters. so theoreticaly only 1000 l/ph filter flow.

he said that if i changed the pumps to something wiht more head height i should be fine. Which was different to what i was going to do which was to change to higher flowing pumps say 5000 l/ph. from what he explained a 3500 l/ph pump max head 4.5m was like having a 1000 l/ph pump with a max head of 15 metres.

so does anyone know of any pumps that would work?

can someone else shed some more light on the subject.

 

[Peter Lovett]

http/www.bubblebeadfilters.co.uk/Compone...ds/HPS05SLR.pdf

Have a look at the above these are commercial pumps which will more than do the job for you.

Head is not just how high the pump can push water as every bend piece of striaght and eqipment at to it. It really just a way of rating how much power the pump has.

But having said that you can get small pump which with pump small amounts of water up to 55m and large pumps which will move huge amount of water only up 1m. It really depends on the pumps motor and the blade that it connects to it.

The smallest pump in the range will pump 4000l at a head of 10meters which should be more than enough for you. I would put a valve after the fliters so that you can regulate the amount of water flowing through.

If you can give me more details on your syatem I will be able to give you a better idea of the pump you will need. But the list of pumps shown should give you some idea of how the flow drops off depending on your head.

 

[Cossack1977]

ok this is the system as it stands:
180gallon heavy fish load, heavy plant load, alot of bog wood

resun 3500l/ph pump (in tank) - arkal 1.5" super disk filter(100 micron) - 20"x 4.5" water filter (20 micron) - fluidized bed filter - co2 reactor - resun 3500l/ph pump (in tank)

link for arkal disk filter: http/www.duralirrigation.com.au/uploads/...cifications.pdf

water filter link:
http/www.duralirrigation.com.au/onlinest...avigationID=517

with this cartridge: (20 micron pleated washable)
http/www.duralirrigation.com.au/onlinest...avigationID=520

no i didnt pay those prices i got everything off ebay at a steel just have to get it working.

 

[Peter Lovett]

I'm sorry to say you are going to find it hard to get a pump that will work with you pre filter as they desinged for primarily main pressure witch I think shout be 6 bar or 87 psi witch is about 61 metres of head.

However a pump similar to the one on the sheet in my last reply should do the job.

But I would need to know the pressure drop accross you pre filter to be sure and would probably need to double it for when it starts to get clogged.

If you can give me that info i'll see if I can size the pump for you. I will over size the pump so you have more flow than you require so you can open up a valve as things start to clogged.

 

[Cossack1977]

I'm sorry to say you are going to find it hard to get a pump that will work with you pre filter as they desinged for primarily main pressure witch I think shout be 6 bar or 87 psi witch is about 61 metres of head.

However a pump similar to the one on the sheet in my last reply should do the job.

But I would need to know the pressure drop accross you pre filter to be sure and would probably need to double it for when it starts to get clogged.

If you can give me that info i'll see if I can size the pump for you. I will over size the pump so you have more flow than you require so you can open up a valve as things start to clogged.

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the link i gave should bring a pdf up of the arkal disk filter. The arkal disk filter is actually used for irrigation purposes so mainly from damns or rivers. the canister filter is used for either mains pressure or tank water.


When you mean more flow do you mean l/ph or head height?

 

[Cossack1977]

would this pump do the trick?

http/cgi.ebay.com.au/Water-Pump-QB80-gar...1QQcmdZViewItem

http/www.china-chenglong.com/ecp-qb.html

 

[Cossack1977]

i can also pick this one up pretty cheap
model: FCP-750

http/www.china-chenglong.com/ecp-jet.html

 

[Tropjunky]

This is a complicated subject if u want to get into all the theory but basicaly don't buy a filer or pump and make it move water over the max head hight i.e. if it says max head hight or 4m then don't have the outlet more then 4m!