ozarowana Posted July 30, 2007 Share Posted July 30, 2007 Can anyone tell me how much a 25mm bulkhead will flow coming out the back of the tank and then down through about 1m of 25mm pipe? There will be a SS strainer as well. If you have a comparable setup/system, what is your pump size and the head that it delivers at. Link to comment Share on other sites More sharing options...
CThompson Posted July 30, 2007 Share Posted July 30, 2007 Give some details for what you want to do (what sized pump and how big is its outlet?). It would be unusual for a pump to have the same size outlet as 25 mm bulkhead. If it is half that size (power outlet), it should be fine to gravity drain through 25 mm sized plumbing. The only person I know who can put maths to such a question is Lee Miller. Link to comment Share on other sites More sharing options...
Ash Posted July 31, 2007 Share Posted July 31, 2007 can the 1m of pipe draining off the bulkhead be enlarged - cause that'll increase flowrate by dropping the back pressure exponentially created within the pipe I can't give you figures though Link to comment Share on other sites More sharing options...
ozarowana Posted July 31, 2007 Author Share Posted July 31, 2007 I am thinking of a two level system consisting of about 9 tanks (with one drain per tank) with a total volume of about 2000L. I'm looking at a 10,000L/hr pump which has a 25mm outlet. I may use a smaller pump if this is too much (it has a 25mm outlet as well), maybe 7400l/hr. Head will be about 1.5m. I can do a 32mm drain but if 25mm will work then I'll just use that. I guess my questions are: 1. Is 10,000L/hr too much turnover for this system? 2. Will 25mm drains/bulkheads be adequate for the 10,000L/hr pump? 3. Is 7,400L/hr better suited for the 25mm drains? 4. Will 32mm drains be adequate for the 10,000L/hr pump? Thanks for you input Link to comment Share on other sites More sharing options...
Ash Posted July 31, 2007 Share Posted July 31, 2007 I guess my questions are: 1. Is 10,000L/hr too much turnover for this system? 2. Will 25mm drains/bulkheads be adequate for the 10,000L/hr pump? 3. Is 7,400L/hr better suited for the 25mm drains? 4. Will 32mm drains be adequate for the 10,000L/hr pump? Thanks for you input 1. not too big, too small if anything - I'm running a 7500lph @ 0m (est 6000lph & 1.5m) head pump on a 3 tank 800l system & could go bigger pump wise - I reckon 10000lph at your 1.5m head height would be the go, so a 12/13000lph @ 0m head pump would be my choice 2. depends on the tank size & the proportion of the flow they are getting - if they are 9 equal size tanks then 25mm bulkheads will do, but if you have one or two larger tanks with more flow perhaps 32mm or 2x25mm for those tanks. 3. I have a 7500lph @ 0 head pump shared between 3 tanks, 2x 25mm & 1x 20mm bulkheads - all with upsized standpipes (standpipes with base drilled bulkheads, not weirs or side drilled) as with all 25/20mm plumbing they were too restrictive (only 3 remember) - so 9x25mm bulkheads with 10000lph should be fine I would imagine. 4. yes, though 9x25mm "may" be fine - but it is easier to have gone too big & have head room than to go back & change it later. I initially had about a meter of 25mm on 3 tanks & it couldn't keep up so I kept the bulkheads up upsized the piping. Please note - all of mine were base drilled so my flow experences may not be valid for your side drilled situation & if you go a bigger pump you might need bigger anyway Link to comment Share on other sites More sharing options...
ozarowana Posted August 1, 2007 Author Share Posted August 1, 2007 Thanks for your help Ash. It gives me alot to go off. Link to comment Share on other sites More sharing options...
robdog013 Posted August 1, 2007 Share Posted August 1, 2007 any pics for those low tech out there? Link to comment Share on other sites More sharing options...
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