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#1
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Pipe size vs flow rate
Hi,
I have been very confused over the relationship between flow rate and pipe/tube size. So I thought I would ask the group to see if anyone could explain it. For the sake of this discussion -- let's eliminate the pump (just assume a pump that is constant and it rated at 1000 gph at 1 ft lift). Let's also eliminate friction over distance (assume distance is "short" enough that it become negelagable). Thus let's just look at what the effect of going from 1/2" tubing to 3/4" would have (for example). Let's also consider the situation of going from 3/4" to 1/2" back to 3/4" (again, let's not worry about distance -- at this point) Thanks for the info Nasa |
#2
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Pipe size vs flow rate
I'm not sure exactly what kind of answer you're looking for, but as I got
help here when researching something for the KHA program, so shall you. I should have saved the one that helped the most. Dang! But I went to google and typed in Flow Rate Chart Pipe Size and came up with: http://eesc.orst.edu/AgComWebFile/EdMat/PNW290.pdf Page 2 has a pretty good chart on pipe sizes versus gpm flows. Of course a pipe under pressure can flow faster than gravity, so we compensate by making our gravity fed pipe size bigger. Do note that if you currently have a 2" pipe flowing at 50 gpm, a second 2" will only give you another 50 gpm or 100 gpm total, whereas replacing the 2" with one 3" will give you 110 gpm, or better 4" gives 200 gpm. Pressure and friction do play a big part. ~ jan On Sat, 07 Aug 2004 19:34:31 -0600, "Nathan A. Smith" wrote: I have been very confused over the relationship between flow rate and pipe/tube size. So I thought I would ask the group to see if anyone could explain it. For the sake of this discussion -- let's eliminate the pump (just assume a pump that is constant and it rated at 1000 gph at 1 ft lift). Let's also eliminate friction over distance (assume distance is "short" enough that it become negelagable). Thus let's just look at what the effect of going from 1/2" tubing to 3/4" would have (for example). Let's also consider the situation of going from 3/4" to 1/2" back to 3/4" (again, let's not worry about distance -- at this point) Thanks for the info Nasa ~Power to the Porg, Flow On!~ |
#3
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Pipe size vs flow rate
I'm not sure exactly what kind of answer you're looking for, but as I got
help here when researching something for the KHA program, so shall you. I should have saved the one that helped the most. Dang! But I went to google and typed in Flow Rate Chart Pipe Size and came up with: http://eesc.orst.edu/AgComWebFile/EdMat/PNW290.pdf Page 2 has a pretty good chart on pipe sizes versus gpm flows. Of course a pipe under pressure can flow faster than gravity, so we compensate by making our gravity fed pipe size bigger. Do note that if you currently have a 2" pipe flowing at 50 gpm, a second 2" will only give you another 50 gpm or 100 gpm total, whereas replacing the 2" with one 3" will give you 110 gpm, or better 4" gives 200 gpm. Pressure and friction do play a big part. ~ jan On Sat, 07 Aug 2004 19:34:31 -0600, "Nathan A. Smith" wrote: I have been very confused over the relationship between flow rate and pipe/tube size. So I thought I would ask the group to see if anyone could explain it. For the sake of this discussion -- let's eliminate the pump (just assume a pump that is constant and it rated at 1000 gph at 1 ft lift). Let's also eliminate friction over distance (assume distance is "short" enough that it become negelagable). Thus let's just look at what the effect of going from 1/2" tubing to 3/4" would have (for example). Let's also consider the situation of going from 3/4" to 1/2" back to 3/4" (again, let's not worry about distance -- at this point) Thanks for the info Nasa ~Power to the Porg, Flow On!~ |
#4
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Pipe size vs flow rate
Found this site a couple of weeks ago. very comprehensive listing of info. Details all the little things that effect how our pond filter systems perform. http://www.advancedaquarist.com/issu.../featurejp.htm -- /\/\ike Chagoi http://ourkoipond.com Nathan A. Smith wrote: Hi, I have been very confused over the relationship between flow rate and pipe/tube size. So I thought I would ask the group to see if anyone could explain it. For the sake of this discussion -- let's eliminate the pump (just assume a pump that is constant and it rated at 1000 gph at 1 ft lift). Let's also eliminate friction over distance (assume distance is "short" enough that it become negelagable). Thus let's just look at what the effect of going from 1/2" tubing to 3/4" would have (for example). Let's also consider the situation of going from 3/4" to 1/2" back to 3/4" (again, let's not worry about distance -- at this point) Thanks for the info Nasa -- /\/\ike Chagoi http://ourkoipond.com |
#5
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Pipe size vs flow rate
Found this site a couple of weeks ago. very comprehensive listing of info. Details all the little things that effect how our pond filter systems perform. http://www.advancedaquarist.com/issu.../featurejp.htm -- /\/\ike Chagoi http://ourkoipond.com Nathan A. Smith wrote: Hi, I have been very confused over the relationship between flow rate and pipe/tube size. So I thought I would ask the group to see if anyone could explain it. For the sake of this discussion -- let's eliminate the pump (just assume a pump that is constant and it rated at 1000 gph at 1 ft lift). Let's also eliminate friction over distance (assume distance is "short" enough that it become negelagable). Thus let's just look at what the effect of going from 1/2" tubing to 3/4" would have (for example). Let's also consider the situation of going from 3/4" to 1/2" back to 3/4" (again, let's not worry about distance -- at this point) Thanks for the info Nasa -- /\/\ike Chagoi http://ourkoipond.com |
#6
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Pipe size vs flow rate
On Sun, 08 Aug 2004 12:34:12 -0400, chagoi wrote:
Found this site a couple of weeks ago. very comprehensive listing of info. Details all the little things that effect how our pond filter systems perform. http://www.advancedaquarist.com/issu.../featurejp.htm Wow, Great website -- thanks Nasa -- /\/\ike Chagoi http://ourkoipond.com Nathan A. Smith wrote: Hi, I have been very confused over the relationship between flow rate and pipe/tube size. So I thought I would ask the group to see if anyone could explain it. For the sake of this discussion -- let's eliminate the pump (just assume a pump that is constant and it rated at 1000 gph at 1 ft lift). Let's also eliminate friction over distance (assume distance is "short" enough that it become negelagable). Thus let's just look at what the effect of going from 1/2" tubing to 3/4" would have (for example). Let's also consider the situation of going from 3/4" to 1/2" back to 3/4" (again, let's not worry about distance -- at this point) Thanks for the info Nasa |
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