Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

11 posts


# 260102 10-Nov-2019 21:20
Send private message quote this post

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. 



Create new topic
291 posts

Ultimate Geek


  # 2351300 10-Nov-2019 21:28
One person supports this post
Send private message quote this post

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. 

11 posts


  # 2351327 10-Nov-2019 22:56
One person supports this post
Send private message quote this post

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.

Create new topic

Twitter and LinkedIn »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

Ring launches indoor-only security camera
Posted 23-Jan-2020 17:26

New report findings will help schools implement the digital technologies curriculum content
Posted 23-Jan-2020 17:25

N4L to upgrade & support wireless internet inside schools
Posted 23-Jan-2020 17:22

Netflix releases 21 Studio Ghibli works
Posted 22-Jan-2020 11:42

Vodafone integrates eSIM into device and wearable roadmap
Posted 17-Jan-2020 09:45

Do you need this camera app? Group investigates privacy implications
Posted 16-Jan-2020 03:30

JBL launches headphones range designed for gaming
Posted 13-Jan-2020 09:59

Withings introduces ScanWatch wearable combining ECG and sleep apnea detection
Posted 9-Jan-2020 18:34

NZ Police releases public app
Posted 8-Jan-2020 11:43

Suunto 7 combine sports and smart features on new smartwatch generation
Posted 7-Jan-2020 16:06

Intel brings innovation with technology spanning the cloud, network, edge and PC
Posted 7-Jan-2020 15:54

AMD announces high performance desktop and ultrathin laptop processors
Posted 7-Jan-2020 15:42

AMD unveils four new desktop and mobile GPUs including AMD Radeon RX 5600
Posted 7-Jan-2020 15:32

Consolidation in video streaming market with Spark selling Lightbox to Sky
Posted 19-Dec-2019 09:09

Intel introduces cryogenic control chip to enable quantum computers
Posted 10-Dec-2019 21:32

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.