Hi guys,
I am looking at getting a Grundfos Scala 2 for my 4 bedroom home running off tank water.
It has 2 bathrooms and garden will be running off a separate pump.
Will the Scala 2 give me enough pressure for my home?
Browse Forums General Discussion Re: Water pump size for no town water? 2Jan 18, 2017 8:27 pm 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: Water pump size for no town water? 3Jan 19, 2017 7:53 am 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Water pump size for no town water? 5Jan 19, 2017 2:39 pm 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Water pump size for no town water? 7Jan 19, 2017 8:21 pm 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Water pump size for no town water? 10Jan 22, 2017 5:22 pm 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Water pump size for no town water? 12Jan 22, 2017 10:48 pm 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Water pump size for no town water? 15Jan 23, 2017 4:44 pm chrismarshall3 Its listed under protective features rather than a restriction. Yes, you are right. I was wondering whether it was a safety feature to protect the 'magnetic' motor (something that I don't know about but is it a DC?) from continuous running at a particular speed but it seemed strange, I should have contacted Grundfos and inquired earlier. I have been told that the Scala2 comes from the factory with the 30 minute maximum continuous running feature OFF and the purpose of the feature is to enable a maximum 30 minutes running time to be set in case of no one being in attendance and a hose or pipe failing. Without the feature enabled, the pump would keep draining the tank. There is no problem with continuous running otherwise. chrismarshall3 Does it matter that the pump's inlet and outlet is 25mm or 1" rather than 32mm. Running 25mm to 32mm converter would add a bit of a bottleneck wouldn't it? No, the flow restriction from 32mm to 25mm is a separate minor calculation and there is an increase in velocity but it doesn't alter the friction losses through the larger pipe at varying lower velocities. Just a note on the 32mm (black) poly pipe. Low Density Poly Pipe (LDPE) usually has a 300 kPa pressure rating and it is much cheaper than the rural (Green Stripe 800 kPa) poly pipe or the metric (Blue Stripe) poly pipe. http://sunshoweronline.com.au/netafim-l ... -poly-pipe currently have the Netafim 32mm low density poly pipe on sale for $135.65 for a 100 m roll. The Netafim brand has a 400 kPa pressure rating and it is a bargain price. LDPE poly pipe has an internal diameter that is very close to the nominal diameter (DN) but the Blue Stripe is measured as an outside diameter (OD) and it also comes in different pressure ratings. For example, the 32mm PN 12.5 (1,250 kPa) has an ID of 27mm and the PN 6.3 (630 kPa) has an ID of 29mm. This is often overlooked. The rural Green Stripe poly pipe is measured as an ID but the fittings are different to Blue Stripe and cost more. The 32mm Green Stripe poly pipe has an ID of 31.5 mm. It is often a juggling act between the best pipe size, the size of the pump and the related costs. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Water pump size for no town water? 16Jan 23, 2017 8:47 pm so the plain black ones are not great for long distances under high pressure such as coming from the pump to the backyard 30m away? I was thinking of using the expensive striped compression piping for long distances connecting the pump to the solenoids. Then the cheaper plain piping where the sprinkler heads are. Or should i just use the expensive stuff all around? Re: Water pump size for no town water? 17Jan 23, 2017 8:55 pm It really depends on the pump. EDIT: Have a look at the video that I have linked below. It is well explained by keeping it uncomplicated by assuming a dead straight run of pipe. If you also pause on the pipe's friction loss chart, you will notice ID and OD as well as the type of pipe. Note that they are also correctly stating ID. https://www.youtube.com/watch?v=KTPKpJg6PsM 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Water pump size for no town water? 18Jan 24, 2017 11:00 am Getting very confused about all this now.. Re: Water pump size for no town water? 19Jan 24, 2017 11:43 am Just understand what is in the video I linked. The 3 different poly pipes have different IDs and pressure ratings but the Blue Stripe is available in several different pressure ratings...and IDs. You size the pipe plus some other allowances expressed as additional pipe length to the pump. It is easy to significantly decrease friction loss by choosing a pipe that has a larger ID. It requires X4 the head to double the flow rate through the same size pipe, it is much cheaper to buy a bigger pipe. The pump's pressure should not exceed the pipe's pressure rating. You also have the choice of using (the more expensive) uPVC pressure pipe. A class 9 (900 kPa) 32mm pressure pipe has an ID of 38.5mm and even the class 9 25mm pressure pipe has an ID of 30.5mm. Pressure pipe is commonly used for irrigation systems and its straight run has less friction loss than undulating poly pipe but flow rate calculators cannot factor this. If you look at this option, the irrigation outlets usually have cheaper pipe than the big green shed and buying 6 metre lengths is the most economical option. Class 9 pressure pipe is cheaper than class 12. You also have to compare the cost of the rolls of the poly pipes and their fittings, Blue Stripe is sold in shorter lengths cut off a roll but you will pay a premium per metre. You will find most irrigation outlets helpful and there is also a lot of information available online. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Water pump size for no town water? 20Jan 25, 2017 8:27 pm Chris, re your current house water pressure; If you will be there for a while yet, you could (possibly) have the Scala2 hooked up to the mains water at the house for use as a booster pump. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Dear Members I have to decide the Facade column size. My custom builder standard is 350mm with rendering, but i asked for 470mm plus stone or tiles and yet to get… 0 7609 |