PVC pipe sizes?

[rigby]

I'm looking for advice on what size PVC pipes to get for my sump. I'm going to be using gravity for intake and a Mag-Drive Supreme 9.5 950 GPH Water Pump back to the tank. If I use the same size PVC for both directions will the pump go faster than the intake? The water has to travel back straight up four feet if that makes a difference. Thanks

 

[bigmac]

Originally posted by rigby
I'm looking for advice on what size PVC pipes to get for my sump. I'm going to be using gravity for intake and a Mag-Drive Supreme 9.5 950 GPH Water Pump back to the tank. If I use the same size PVC for both directions will the pump go faster than the intake? The water has to travel back straight up four feet if that makes a difference. Thanks
What do you mean by gravity for intake, how are you going to have it setup to drain to the sump? Are you going to have a bulkhead at the bottom of the tank and use a stand pipe?

 

[rigby]

I'm just going to use a siphon effect to get the water down (should i use a pump?) and into the sump. I have no idea what a bulkhead or a stand pipe is sorry, please explain.

 

[bigmac]

You might want to put some towels down, I see a wet floor coming soon to the tank near you.
So your just going to stick a hose in the tank a let it flow? What's going ot happen if and when the power goes out? The pump will stop but the siphon will keep on going. What happens if the siphon breaks? The pump will keep on going and flood the tank. Save your money and wet floor and get a HOB U tube overflow (not CPR)
Have you ever seen how an Overflow works? If not go find one and study it for a while. You could drill the tank and put a bulkhead in but flow would be real slow.
I might be missing something here. Your not to exact on how you plan to set it up.

 

[rigby]

Thanks for the help bythe way. What is a HOB U tube overflow? I figure I'll just put the syphon 2-3 inches deep into my tank, that way if the power goes out it can only suck up like 30 gallons of water and I'll have a 40 gallon sump. I realize i'm a bit uneducated so far but I'm trying.

 

[bigmac]

Hmmm, that will work unless the power comes back on. You'll loose siphon when it sucks air as the level drops and then when the pump kicks back on all the water from the sump will flow back into and over the sides of the tank.....
HOB stands for Hang On the Back.......I'd go study one before you set any thing up.
These things can seem hard to understand but there really not, you just have to see em

 

[rigby]

What if I divide the sump in 3 o 4 sections with 10 gallons (approx) in each. If I then loose the siphon the copartment will only have 10 gallons for the pump to pump. Would the pump burn up without water?

 

[bigmac]

It wont work for a lot of reasons...here's another.
You'll have to have the siphon flow exactly as fast as the return pump. not one ounce faster or one ounce slower. You might think you can do that but you can't..
There's a reason people have overflows......

 

[rigby]

Ok, I give in. What's a good overflow. I can't do any drilling, I already have the tank set up (65 gal). Are there any other options, I'm a poor student and an overflow is gonna be at least $50. Thanks so much

 

[dlc]

gravity for intake and a Mag-Drive Supreme 9.5 950 GPH Water Pump back to the tank. If I use the same size PVC for both directions will the pump go faster than the intake?
Pipe size has little to do with the pump speed. Inlet and outlet pipe sizes that are supplied on the pump should be fine for the installation. By increasing pipe size you reduce the friction losses (head loss) in the system.
The real question is how much head (pressure) does the pump produce? If it has to pump the medium 4 feet high then it will need to produce at least 1.7 psi for the height alone. That does not include line losses due to fittings and such.

 

[blu-thang]

I have a simular delema,my sump is to small for two sump pumps one for return and another for my skimmer pump 1 rio 2100 pump 2 mag 9.5