Browse Forums Building A New House 1 Mar 30, 2019 8:27 pm Hi, To all the experts. I like to get your comments. Today in Melb. we have heavy rain so I thought great, lets take this opportunity to check the down pipes to ensure all is good before my PCI. Please refer to the 2 videos below: Water seems to be spewing out from the connectors. Could this be because the square connectors are not wide enough to let the water flow smoothly? Or worst case the down pipe below is partially blocked? The 1st video also showing water streaming down from above. I guess gutter connection above is also leaking? Sigh. didn't notice it until I watch the video. Only notice this on 2 down pipes. These are small files videos: https://ufile.io/as864 https://ufile.io/2l3gi Thanks Re: Downpipe connection spitting out water. 2Mar 31, 2019 12:40 am The "connectors" are 100mm x 50mm x 90mm downpipe adaptors and their role is to transition the rectangular pipe to a round 90mm pvc stormwater pipe. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Next time you are in Bunnings and if you remember, go to the plumbing department and look inside one of these adaptors. What you will see is a substantial flow path restriction as shown in the second photo. Basically, water flows down the downpipe's inner walls and then dead ends at the bottom because the adaptors are made as compact as possible to save on manufacturing as well as transport costs. If you look at the third photo, you will see that this one transitions a lot better and is less prone to blockages because of the design but it is also higher and so it costs more to make and transport. Getting back to the ones you have, they are very compact (standard fare cheap) and so a large amount of the water will be 'dead ending' and splashing up the short distance between the adaptor and the rectangular downpipe. This is much more likely if the downpipe no longer fits all the way into the adaptor because the sub surface pipes have settled a bit. The gap between the adaptor and the downpipe must never be sealed because it provides the water with an outlet should there ever be a blockage or a stormwater surcharge during heavy rain. The adaptors are actually non compliant because the downpipe's flow path is restricted and prone to blockages, a twig for example can easily lodge on the ledges across the flow path but the non compliance is ignored. If you do ever get a blockage, you can tell by tapping on the downpipe. MyFirst Water seems to be spewing out from the connectors. Could this be because the square connectors are not wide enough to let the water flow smoothly? Or worst case the down pipe below is partially blocked? So...the answers are yes and possibly (but not probably) yes. A blockage would invariably be on the adaptor's internal flow path restriction, not in the lower pipe. 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: Downpipe connection spitting out water. 3Mar 31, 2019 9:57 am SaveH2O The "connectors" are 100mm x 50mm x 90mm downpipe adaptors and their role is to transition the rectangular pipe to a round 90mm pvc stormwater pipe. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Next time you are in Bunnings and if you remember, go to the plumbing department and look inside one of these adaptors. What you will see is a substantial flow path restriction as shown in the second photo. Basically, water flows down the downpipe's inner walls and then dead ends at the bottom because the adaptors are made as compact as possible to save on manufacturing as well as transport costs. If you look at the third photo, you will see that this one transitions a lot better and is less prone to blockages because of the design but it is also higher and so it costs more to make and transport. Getting back to the ones you have, they are very compact (standard fare cheap) and so a large amount of the water will be 'dead ending' and splashing up the short distance between the adaptor and the rectangular downpipe. This is much more likely if the downpipe no longer fits all the way into the adaptor because the sub surface pipes have settled a bit. The gap between the adaptor and the downpipe must never be sealed because it provides the water with an outlet should there ever be a blockage or a stormwater surcharge during heavy rain. The adaptors are actually non compliant because the downpipe's flow path is restricted and prone to blockages, a twig for example can easily lodge on the ledges across the flow path but the non compliance is ignored. If you do ever get a blockage, you can tell by tapping on the downpipe. MyFirst Water seems to be spewing out from the connectors. Could this be because the square connectors are not wide enough to let the water flow smoothly? Or worst case the down pipe below is partially blocked? So...the answers are yes and possibly (but not probably) yes. A blockage would invariably be on the adaptor's internal flow path restriction, not in the lower pipe. Thanks for your explanation. Will speak to ss on Monday if he can replace the connectors etc. Re: Downpipe connection spitting out water. 4Mar 31, 2019 10:02 am MyFirst SaveH2O The "connectors" are 100mm x 50mm x 90mm downpipe adaptors and their role is to transition the rectangular pipe to a round 90mm pvc stormwater pipe. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Next time you are in Bunnings and if you remember, go to the plumbing department and look inside one of these adaptors. What you will see is a substantial flow path restriction as shown in the second photo. Basically, water flows down the downpipe's inner walls and then dead ends at the bottom because the adaptors are made as compact as possible to save on manufacturing as well as transport costs. If you look at the third photo, you will see that this one transitions a lot better and is less prone to blockages because of the design but it is also higher and so it costs more to make and transport. Getting back to the ones you have, they are very compact (standard fare cheap) and so a large amount of the water will be 'dead ending' and splashing up the short distance between the adaptor and the rectangular downpipe. This is much more likely if the downpipe no longer fits all the way into the adaptor because the sub surface pipes have settled a bit. The gap between the adaptor and the downpipe must never be sealed because it provides the water with an outlet should there ever be a blockage or a stormwater surcharge during heavy rain. The adaptors are actually non compliant because the downpipe's flow path is restricted and prone to blockages, a twig for example can easily lodge on the ledges across the flow path but the non compliance is ignored. If you do ever get a blockage, you can tell by tapping on the downpipe. MyFirst Water seems to be spewing out from the connectors. Could this be because the square connectors are not wide enough to let the water flow smoothly? Or worst case the down pipe below is partially blocked? So...the answers are yes and possibly (but not probably) yes. A blockage would invariably be on the adaptor's internal flow path restriction, not in the lower pipe. Thanks for your explanation. Will speak to ss on Monday if he can replace the connectors etc. You said non compliant however I see many houses uses it? I know doesn't make it right. Re: Downpipe connection spitting out water. 5Mar 31, 2019 11:50 am MyFirst Will speak to ss on Monday if he can replace the connectors etc. They won't change the adaptors for you because they are what they are, I explained their design failings to give you a better understanding of why blockages can happen and to warn you not to seal the gap. Practically all sizes of downpipe adaptors are effectively not compliant because they affect a restriction in the downpipes minimum cross sectional flow path area but some are more severe than others. This happens when free rein is given to the mass fitting of initially compliance questionable products and in the case of the 100mm x 50mm x 90mm downpipe adaptors, some manufacturers now make them a lot more compact (lower) as the result of prior non compliance acceptance and to do that, the inside 'ledges' have become flat to reduce the height as yours are. If manufacturers can cut manufacturing and transport costs, they will. If they don't, their competitors will. Damned if they do, damned if they don't. PVC downpipes not certified to AS 4020 for products for use in contact with drinking water are also non compliant if the roof water is harvested for potable use but a blind eye is turned to that as well for practical reasons. Your 100mm x 50mm gutter pops are really 95mm x 45mm and are also not compliant because they are smaller than the downpipes they fit into but that is also overlooked for practical purposes. If the house was deemed to need a minimum size of 100mm x 50mm rectangular downpipes and you fitted 95mm x 45mm downpipes, they would be deemed not compliant and the same goes if you were to fit a downpipe designed with the same size flow path restriction somewhere along its length that the adaptors present. Just take the additional information as added interest. 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: Downpipe connection spitting out water. 6Mar 31, 2019 2:10 pm SaveH2O MyFirst Will speak to ss on Monday if he can replace the connectors etc. They won't change the adaptors for you because they are what they are, I explained their design failings to give you a better understanding of why blockages can happen and to warn you not to seal the gap. Practically all sizes of downpipe adaptors are effectively not compliant because they affect a restriction in the downpipes minimum cross sectional flow path area but some are more severe than others. This happens when free rein is given to the mass fitting of some products and in the case of the 100mm x 50mm x 90mm downpipe adaptors, some manufacturers now make them a lot more compact as the result of free design licence and to do that, the inside 'ledges' have become flat to reduce the height as yours are. If manufacturers can cut manufacturing and transport costs, they will. If they don't, their competitors will. PVC downpipes not certified to AS 4020 for products for use in contact with drinking water are also non compliant if the roof water is harvested for potable use but a blind eye is turned to that as well for practical reasons. Your 100mm x 50mm gutter pops are really 95mm x 45mm and are also not compliant because they are smaller than the downpipes they fit into but that is also overlooked for practical purposes. If the house was deemed to need a minimum size of 100mm x 50mm rectangular downpipes and you fitted 95mm x 45mm downpipes, they would be deemed not compliant and the same goes if you were to fit a downpipe designed with the same size flow path restriction somewhere along its length that the adaptors present. Thanks for your reply. Building Standards; Getting It Right! It's all good. You can get both wye piece and the coupling with or without thread. The cost difference is negligible and means the plumber only has to carry the single… 1 3819 Hi all I'm currently building a duplex in Sydney and we need to do a new water connection to the second unit. The water main is on the other side of the road so we need… 0 3192 |