Browse Forums General Discussion Re: Water Tank Charged System Head 2Nov 04, 2021 4:46 pm Architectural Homes & Duplexes - specialising in custom designing homes to your budget Get a Free Onsite Consultation Today or send a PM for information, questions or advice. Re: Water Tank Charged System Head 4Nov 05, 2021 5:19 am Architectural Homes & Duplexes - specialising in custom designing homes to your budget Get a Free Onsite Consultation Today or send a PM for information, questions or advice. Re: Water Tank Charged System Head 5Nov 05, 2021 3:16 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 Tank Charged System Head 8Nov 07, 2021 5:54 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 Tank Charged System Head 11Nov 10, 2021 8:42 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 Tank Charged System Head 13Nov 11, 2021 9:08 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 Tank Charged System Head 16Dec 11, 2021 10:05 pm Sorry for the late reply, I didn't see your post until earlier this week and I have been unavoidably delayed since then. I'll answer your queries in order without quoting because the Qs are within my last post unfortunately. I call it a low restriction inlet because it has a less restrictive straighter flow path with more head amd less pipe and fittings. It is very simple and super effective but can only be used if leaf diverters or our Supadivertas are fitted. Re 3 DPs supplying a 150mm pipe & low restriction inlet, you are on the right track...I'll comment in detail later. Re Tankvac and 100mm overflow. The Tankvac would have to be fitted below the 100mm invert (bottom of pipe) which will reduce the tank's storage capacity. I have been experimenting with a simple, low cost DIY bottom syphon system that I will detail on our new website (coming soon) that people can fit to their tank at very low cost and have found the following during my research:
You also have to be aware of costs plus requirements to have rodent and mosquito proof mesh fitted to the tank's overflow outlet or pipe. I strongly suggest you don't fit mesh to the outllet for more than one reason! Next Q...see above answer. The Supadiverta has an internal 750mm 50 degree sloped filter but it is not suitable for your situation. Tankvac and air gap...yes. Don't try using a meshed tank outlet with a Tankvac but be aware of mandated rodent and mosquito proofing requirements for water storage tanks. TANK 1. 760 lpm during a minimum 1:20 ARI. Having leaf diverters allows you to divert directly into the tank. Do you know approximately the roof areas that each DP drains? IF hypothetically all DPs drained equal roof areas, each would drain 60 sq m and drain 152 lpm during a bare minimum 1:20 ARI. Two left DPs. A 104mm ID pipe flowing at 304 lpm has 0.35 meters of friction loss over 100m but you need to design for more than 304 lpm. Regardless, offsetting this is the fact that there isn't 100 metres of pipe and the DP nearest the tank recharges the carrier pipe at that station (important to use a 45 degree junction) plus the flow rate between the upstream leaf diverter and the downstream one is slower (less friction loss) than the section of pipe between the downstream leaf diverter and the tank. If this pipe diverted to a 100mm inlet at the top of the tank's wall, am I correct in assuming that you woud have an additional 150mm of head? Also, approximately how long is the ground level pipe? It is easy enough for me to add the fittings' friction losses as equivalent pipe lengths plus the riser etc and do calculations if I know the other lengths and roof areas. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ https://www.nationalpump.com.au/calculators/friction-loss-calculator/ Three right DPs. This pipe run needs a more accurate calculation but our hypothetical calculations denote 456 lpm during a minimum 1:20 ARI. The DP nearest the tank is very close and 456 lpm is a velocity of 0.9 metres per second but you need to design for more flow than this. If I know the distance between the DPs and the approximate area of each roof area, I can do some quick calculations. Upsizing to 150mm pipe before the DP closest to the tank will be vital. The 150mm SN4 has an ID of 151.6mm. We'll do some calcs and then look at a low restriction inlet. You will need two unmeshed 100mm high flanged overflow outlets connecting to a single 100mm DWV vertical overflow pipe but have the holes drilled lower than usual so that there is a bare minimum 100mm above the vertical pipes intakes. https://www.bunnings.com.au/rain-harves ... w_p4760110 TANK 2. 355 lpm during minimum 1:20 ARI. Having leaf diverters allows you to divert directly into the tank. It looks like you can plumb the corner DP as a dry system and have the other two DPs converge at a 100mm 88 degree junction (tee) and then a bend (elbow) at the bottom of a riser which either diverts to the tank's top meshed inlet or to a 100mm inlet at the top of the tank's wall. This would be the same level os the overflow and so there would be no reduction in storage capacity.. A single 100mm unmeshed overflow with a high intake elbow will suffice but have the hole drilled lower than usual so that there is a bare minimum 100mm above the vertical pipe's intake. https://www.bunnings.com.au/rain-harves ... w_p4760110 Holes for high flanged outlets...the top of the intake (crest) will be about the level of the bottom of a horizontal outlet. These fittings are foolishly promoted to increase a tank's storage capacity but done so by not warning consumers about the need to ensure that the tank's overflow capacity is not severely compromised. https://rainharvesting.com.au/products/ ... xtra-high/ Leaf Eaters are not essential for a dry system. Inform the tank dealer about using high flanged overflows. If considerig (or needing) a 150mm low inlet, it is best to ask the manufacturer and also get prices plus ask about availability of flexible hose. It would be the ideal solution. Tankvac's outet is at the top and it responds to the water level. The 80mm pipe diverts into a larger pipe and the syphon breaks at that point. Don't be fooled that it cleans the entire floor, a pool vac is the go. Also see previous comments about Tankvac. My DIY sediment trap design is very effective at removing bed load from the carrier pipe, It is far more effective to improive the water quality in the wet system by reducing as much muck as possible from entering the tank. 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 Tank Charged System Head 17Dec 17, 2021 8:08 am I really appreciate your replies and i'm even slower than you in getting back! So i've dug and measured my pad heights and have exact measurements of fall etc. keen to post and update and hopefully nail down and configuration. Re: Water Tank Charged System Head 18Apr 03, 2023 6:01 pm Thanks everyone, I just had some questions about charged systems, found this page and seems I will end with a whole trade qualification from here. Excellent information from people who know what they are talking about! Cheers. Aspiring builder trying to focus on doing the right thing! There must be such a thing as a good builder that I have not found yet! Trying to create it then! Re: Water Tank Charged System Head 19Apr 10, 2023 8:44 am SaveH2O Re Tankvac and 100mm overflow. The Tankvac would have to be fitted below the 100mm invert (bottom of pipe) which will reduce the tank's storage capacity. I have been experimenting with a simple, low cost DIY bottom syphon system that I will detail on our new website (coming soon) that people can fit to their tank at very low cost Have you had a chance to finalise the cheap, DIY bottom syphon system? I'm keen to start experimenting but might not need to if someone has already perfected it Re: Water Tank Charged System Head 20Apr 16, 2023 6:04 pm Unfortunately, the new website has been substantially delayed but the DIY tank vacuum system to be included is a simple DIY solution that uses low cost off the shelf fittings that I can detail here. The figures below may need refining after testing is resumed. Note that this method will not give the tank a total clean but it will clean the strategic areas chosen. 1. A drain hole needs to be drilled close to the bottom of the tank. The hole size will depend on the tank's size and height, the tank's floor area and the length of the vacuum pipes. A large tank will require a longer length drainpipe with a larger diameter. 2. There are YouTube videos that show how to lower a tank's outlet fitting into the tank and work it through the hole. The difference will be that you will also need to attach a short flexible hose to the fitting and attach the other end of the hose to a tee's branch. It is usually best to use a faucet tee (female thread in the tee's branch) but there are various options you can explore. Alternatively, you can plumb a single straight suction pipe but with a branch pipe that suctions the area around the tank's outlet that supplies the pump. 3. You must also connect pipes to the tee's two sockets and to do this, you usually need to connect one of the pipes to the tee once the tee is inside the tank. You can mark the pipe and the tee with pencil lines to ensure that the pipe joins the tee at the correct position. PVC pressure pipe can be curved a little by applying heat with a heat gun. Don't let the heat sit on one spot, keep it moving to avoid the pipe being burnt and keep it away from the ends. You must have the pipes shaped beforehand for obvious reasons and for equally obvious reasons, the end of the pipes must be capped but you can drill a hole in each cap. 4. Calculate the cross-sectional area of the pipe you are using and try to buy class 9 or class 6 pressure pipe because they have larger internal diameters than class 12 pressure pipe. 5. Drill 8mm holes at 4:30 and 7:30 o’clock. The 90-degree angle between the holes is considered optimal. You can also drill some 8mm holes in the tee. The cross-sectional area of an 8mm hole is 50.3mm. For larger tanks where a larger drainpipe is used, the holes furthest away from the drain outlet need to be increasingly larger. If all the holes in the pipe are the same size, the water and sediment closest to the pipe's outlet will be drawn towards the pipe more quickly than the water and sediment further away from the outlet. 6. The velocity through the holes must be between 0.5 m/s and 1.0 m/s. This flow velocity is high enough to effectively draw sediment towards the vacuuming pipe, but not so high that it causes excessive water turbulence and wastage. It also allows the total cross-sectional area of the holes to be up to 1.3 times the drainpipe’s cross-sectional area. This is known as the Open Area Ratio. 7. Open the drain valve when the tank is nearly full and rain is expected. You should not need to open the drain valve for more than 40 seconds or else close it once the discharge water is clear. A higher water level will produce greater discharge flow rates but coversely, the higher the water level is, the greater the flow rate required to effectively draw sediment towards the pipe. This is because an outlet draws water from above, the reason for the formation of free surface vortices in some other situations. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. If you can calculate the reasonable charged head from let's say 100mm below the gutter to the top of where the vertical riser's horizontal discharge pipe will be, that… 11 17530 Once you know the basics, the rest is easy. Read my post in the thread linked below. viewtopic.php?p=1919271#p1919271 2 19516 18 90481 |