Browse Forums General Discussion 1 Jul 29, 2013 3:17 pm want advice on size of poly water pipe to run 130metres from water main to house with 3 basins, 2 laundry sinks, 2 showers, 1 bath, 1 kitchen sink and 2 toilets. would DN20 or DN25 be best between mains and house and then DN20 for the house. Re: plumbing pipe size 130m length 2Jul 29, 2013 3:50 pm There is no straight forward answer it depend on the flow you want and the pressure you have currently got. DN 20 should be good for around 0.7L/sec but you will lose around 80m of head at that flow. DN25 should be good for around 1.2L/sec and you will lose around 55m of head at that flow. So I would tend to go for the bigger pipe. If you are struggling for pressure it might even be worth considering DN32. The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: plumbing pipe size 130m length 3Jul 29, 2013 7:56 pm A qualified person who is licensed to do this work and issue the necessary compliance certificate would be able to advise if they chose to do so. Different fixtures have different mandated minimum flow rate deliveries. The maximum flow velocity allowed is 3 metres per second. A pipe's internal diameter is not always its nominal size. You need to know the head. I am not prepared to give detailed advice to a person who may be intending to do unlicensed plumbing work but if you read John Hearfield, you will access some of the best basic advice available. http://www.johnhearfield.com/Water/Water_in_pipes.htm http://www.johnhearfield.com/Water/Water_in_pipes2.htm 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. DIY, Home Maintenance & Repair 3 pipes are coming from upstairs bathroom. 40mm from bathroom sink, 50mm from shower and another 50mm from the bathtub. Highly unlikely that any of these will be open at… 2 844 yep sounds good make the footing bigger to to allow for the pipe in the middle 3 7320 Plumbers 'can be' plumbers, made all the worse by self certification which the building surveyor invariably accepts as proof of compliance! The good thing is that you know know. 3 4860 |