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11 posts


#260102 10-Nov-2019 21:20
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I'm about to take delivery of 2x 25,000L tanks which will be installed on a hill with about 30m of vertical head between them, about 60-80m away. I will have a shed about 5m above the lower tank, collecting rainwater to the lower tank, and will pump up to the top tank to supply the property with decent pressure via gravity.


The property is off grid, so the transfer to the top tank will happen by use of a petrol driven pump until there is a house feeding the top tank in a few years.


This post is mostly about sizing the polythene pipe. I'll buy about 100m of it and the price of the pipe doesn't vary a great deal between 32,40 or 50mm so my initial thought was to go for 50mm, but when I price out the various valves and fittings, there is an exponential impact on the price for fittings depending on the size so I don't want to go for significantly larger than I need, and I'm thinking a 50mm system is overkill for the price.


A good honda powered pump will handle the head at either 2" or 1.5" outlets, so I'll set up the system with some Tees, Ballcocks and camlocks (to connect the transfer pump when necessary). 


A couple of retailers are happy to sell me whatever I want, without much advice as such, so, what would a 'typical' pipe size be for a system like this, without greatly affecting transfer flow up much or supply flow & pressure down?  I'll buy 100m roll to do as much as I can, and reduce it down for supply at the shed. 



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Ultimate Geek


  #2351300 10-Nov-2019 21:28
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Go for the 50mm pipe. 


If you're worried about the cost of fittings, Fit a reducer at each end of the 50mm and do all the fit off in 25, 30 or 40 whichever gives you the economy.


and if you ever disappointed with the results you can take it out to 50, 


I would use 50 at the tank end as when pumping its going to have the lowest pressure, hence you want the best flow, 


at the pump you could get away with 30 or 40 as you have max pressure. 




Cheat on the fittings, not the pipe 


There are loss charts for that pipe available, start with the manufacturer. 

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  #2351327 10-Nov-2019 22:56
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Thanks for your reply Jeremy. I took at look at some loss charts and it is quite an eye opener how much better 50mm pipe is vs 40 or 32, so everything you say makes perfect sense, although I'm tempted just to suck it up and skip the reducers to go for 50mm fittings also. Cheers.

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