bwah Posted October 29, 2010 Share Posted October 29, 2010 Anyone running one of these? in-particular this design below.. http://www.aquariumlife.net/projects/diy-overflow/120.asp Link to comment Share on other sites More sharing options...
Josh Posted October 29, 2010 Share Posted October 29, 2010 What do you mean by " you cant get it to work " ? Dose it not start, stop, syphon at all? Josh Link to comment Share on other sites More sharing options...
bwah Posted October 29, 2010 Author Share Posted October 29, 2010 well, it starts.. flow rate is ridiculous (1" pipe) until i block of the syphon break, and then it flows properly but by blocking off the syphon break, it will not stop syphoning in case of a powerout thus defeating the purpose i dont think it is the best design for high flow applications.. my return pump is rated 4500lph should of done more research before building it oh well back to the drawing board.. Link to comment Share on other sites More sharing options...
dogboy Posted October 29, 2010 Share Posted October 29, 2010 so are you running the pump during these tests??? the idea is that it doesnt siphon the water but acts as a waterbridge to allow the tank to "overflow" as it fills. it should drain at the same rate as the water levels rise when the pump is working thus keeping the water levels in the tank constant. Link to comment Share on other sites More sharing options...
bwah Posted October 29, 2010 Author Share Posted October 29, 2010 yeah pump was running and i thought the same thing.. but my design is poor and doesn't do this i made what is called a horizontal flow setup i should of gone for a vertical flow setup with larger pipe diameter Link to comment Share on other sites More sharing options...
pjmowens Posted October 30, 2010 Share Posted October 30, 2010 Mate i ran two exactly the same for 2 years. i used 32mm pipe. One seemed to be able to cope with my or3500 but i installed a second just for piece of mind. Never had a drama. There is another site that has alot threads full of questions, answers and modifications on it. If you would like to know pm me. Link to comment Share on other sites More sharing options...
bwah Posted October 31, 2010 Author Share Posted October 31, 2010 just finished another one.. different design, made from 40mm pipe flows match pump, which is excellent! the design in the link on my first post is inferior for high flow applications i dont know how much a or3500 flows, im assuming 3500Lph.. with no head? i would be very surprised if the overflow kept up assuming it was the same design Link to comment Share on other sites More sharing options...
pjmowens Posted November 2, 2010 Share Posted November 2, 2010 taking into account head at a guess my pump ran 2500-2800lph. had it up and running so im not very surprised with it. Link to comment Share on other sites More sharing options...
bwah Posted November 2, 2010 Author Share Posted November 2, 2010 good to hear.. extra pipe size definatly helped u i think maybe i needed to extend the vertical lengths on my original design to reach max flow rate but it still would of been way underpowered with 25mm pipe Link to comment Share on other sites More sharing options...
pjmowens Posted November 3, 2010 Share Posted November 3, 2010 the overflow is not exactly the same as mine. shape and design are similar but my 'tee' sits much lower. this allows greater flow through a greater suction created. also my intake went all the way to the bottom and back up. this ensured to maintain the syphon in case of power outage etc... Link to comment Share on other sites More sharing options...
bwah Posted November 3, 2010 Author Share Posted November 3, 2010 the overflow is not exactly the same as mine. shape and design are similar but my 'tee' sits much lower. this allows greater flow through a greater suction created. also my intake went all the way to the bottom and back up. this ensured to maintain the syphon in case of power outage etc... ah well that explains it, the overflow in the link that i posted relies on horizontal flow rates which are inferior compared to vertical flow rates which are present in this design that ive just made which im assuming is similar to yours Link to comment Share on other sites More sharing options...
pjmowens Posted November 4, 2010 Share Posted November 4, 2010 spot on. any reason for reducing down after the tee? you can also experiment with putting a cap on the vent and drill a small hole in it to limit noise. never did it but its the same concept as used in a durso standpipe design. Link to comment Share on other sites More sharing options...
bwah Posted November 4, 2010 Author Share Posted November 4, 2010 because the overflow rate is determined by the 40mm pipe, once it gets to the 25mm pipe it is basically in full siphon and 25mm pipe under full siphon conditions can easily keep up with the flow rate acheived by the 40mm overflow as for the cap, you are right.. it stops the gurgling sound Link to comment Share on other sites More sharing options...
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