Siphon Questions

[imclownfish]

I am starting a sump soonand had some siphon questions,
1) how can you make a siphon that will never break, for example when the power runs out
2) to stop a reverse siphon, holes have to be made in the return line, but how does that work?
Thanks,

 

[beaslbob]

Originally Posted by imclownfish
http:///forum/post/3243809
I am starting a sump soonand had some siphon questions,
1) how can you make a siphon that will never break, for example when the power runs out
you "trap" the water in the siphon. With boxes to insure both ends of the tube are underwater and with on overflow to stop draining at some water level. Or use a pvc over flow similiar to my thread:
https://forums.saltwaterfish.com/vb/s...highlight=trap
2) to stop a reverse siphon, holes have to be made in the return line, but how does that work?
1) have the ends of the return line above the water line or 2) drill small holes in the return tubes just above the water line pointing down. Either work by allowing air to enter the return lines breaking the siphon.
Thanks,
You're welcome

 

[imclownfish]

im still not quite getting the pvc overflow. would you say this design will have a continuous siphon?

 

[beaslbob]

Originally Posted by imclownfish
http:///forum/post/3243899
im still not quite getting the pvc overflow. would you say this design will have a continuous siphon?
Under power out the tank level would drop to the horizontal part where the yellow and green meet. then stop draining. that is as long as the red over the top part is open to the air.
the siphon in the blue part would be maintained as long as the air line does not leak. Otherwise air would form there but even then the blue/yellow part would trap water in the pipe. so when power returns the air line could suck out air and restart the siphon.
It is basically the same concept as the ones in my thread.
And it can be confusing until you actually spend a few bucks and build one. When you see it running then all types of light bulbs come on.
my .02

 

[imclownfish]

thanks for all the help. Now i understand

 

[beaslbob]

Originally Posted by imclownfish
http:///forum/post/3244295
thanks for all the help. Now i understand
welcome Now you can explain it to me.

One thing about those designs is to be sure to incorporate some means of initially getting water in the blue-yellow water trap area. some who didn't do that spend long fustrating hours trying to get the water trap full of water.
my .02

 

[imclownfish]

lol, to fill the middle chamber, you just flip the elbow in the red section up. But now i have a problem. There is barely any flow. Im using 1/2" pvc and im guessing that should be roughly 200gph. I think im only getting about 50gph. ANy ideas why?