Algae Posted November 7, 2011 Share Posted November 7, 2011 Anyone know what the optimum/required drop angle for a horizontal run of pipe is? I have heard it is a minimum of 45 degrees. I know the head pressure can determine the angle. I'll be running an effective 1300 gph and the pipe is 1 1/2" and I want to achieve "full siphon" which is well within the capacity of the pipe/overflow. Oh yeah, this is for a return to the sump, if you haven't already guessed.(laugh) Thanks! Link to comment Share on other sites More sharing options...
Smann Posted November 7, 2011 Share Posted November 7, 2011 Haven't read anything on that, mine is 1 1/4", I used Flex PVC, it runs straight down for about 16" then curves to horizontal for a few feet into the gate valve then curves down into the sump/sock. From what I've experienced with water flow once a siphon is running well below the start point it could run up hill as along as it stayed below start point Link to comment Share on other sites More sharing options...
Algae Posted November 7, 2011 Author Share Posted November 7, 2011 Haven't read anything on that' date=' mine is 1 1/4", I used Flex PVC, it runs straight down for about 16" then curves to horizontal for a few feet into the gate valve then curves down into the sump/sock. From what I've experienced with water flow once a siphon is running well below the start point it could run up hill as along as it stayed below start point[/quote'] Steve, I know what your saying. Since I will be running a Bean Animal I think the issue is starting up again after a power loss. It may want to cycle between going through the full syphon and "open channel"? How far is your horizontal run. Oh, bye the way, thanks for the link to the discount flexible PVC seller. A lot cheaper than anything local. Link to comment Share on other sites More sharing options...
Smann Posted November 7, 2011 Share Posted November 7, 2011 during start up the siphon should work fine, mine is a little different from his original design, I had to lower the siphon pipe then raise the water level to avoid the whirlpool/air then set the secondary at that level the siphon is left then secondary then emergency, with the larger pipe you have to raise the water level with the gate valve or you will suck air so my siphon starts the whole sequence while the water rises in the over flow here is a shot of the line and gate valve Link to comment Share on other sites More sharing options...
Algae Posted November 8, 2011 Author Share Posted November 8, 2011 Nice setup, Steve! Does your siphon start up quickly after a power outage? Does your siphon have a T on it to eliminate the vortex effect too? Link to comment Share on other sites More sharing options...
Smann Posted November 8, 2011 Share Posted November 8, 2011 Since the siphon is lower it gets the water first, takes several minutes to get up and running but always balances out to exactly the same level (marked). I didnt put the T on this one or my Temp system, not sure why, seems I just liked the straight shot to the siphon plus raising the water level in the over flow makes it quiet, who knows! Link to comment Share on other sites More sharing options...
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