SCWD and output drop-off?
- Thread starter kevindub
- Start date
I've had mine for about two months now, and I'm happy with it so far. I had to reduce flow on my pump because my overflow can't keep up, so IME it does not restrict flow that much. As far as durability, I can't speak for that yet. They don't make any noise while changing current direction. Hope this helps.
30% before any friction loss in your piping.
No noise at all once its up and running. I have had mine going for about 2 years. When it gets cruddy, I take it outside and use the hose with a jet nozzle and shoot it in the botton to clean it out.
Use Stainless hoseclamps I have had no leaks.
I happen to have another laying around, I may just mod that baby!
No noise at all once its up and running. I have had mine going for about 2 years. When it gets cruddy, I take it outside and use the hose with a jet nozzle and shoot it in the botton to clean it out.
Use Stainless hoseclamps I have had no leaks.
I happen to have another laying around, I may just mod that baby!
ive got 1750 gph (blueline 70) going to two of them. They do make noise when you put alot of pressure on them. If you are handy, you can plumb them with pvc by threading the inputs and outputs with a threader to half inch.
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Ferrari 125 S
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Ferrari 125 S
Another issue that can cause system perfomance issues is poor system design. Its not a slam against anyone, because most folks do not understand piping design and fluid dynamics. We by a pump and hook that baby up, right?
Thats not really the best thing to do. Start with your system parameters, i.e. how much flow do you want? How many outlets do you want? How will the pump get flow in and out?
There are basic rules you can use to help you
1. inlet MUST be 1/2 pipe diameter larger than outlet.
2. Suction line into the pump must be AT LEAST 7 pipe diameters straight with no fitings. Thus, if your inlet is 1", you should have at least 7" of straight pipe before you turn the line up, or before it reached its first fitting.
3. Design your system plumbing first. Fewer fittings is better. Once you have your sustem designed, figure the number of fittings and calculate the friction loss for the entire system. Here is a link to some friction loss tables for popular fittings
http://208.234.19.147/catalog/_pumps/friction.html
All this is to keep your system flowing the way you want it too. Pumps are pretty simple machines, but they operate a specific way. Too much back pressure on the outlet can kill the flow just like a restricted inlet.
Thats not really the best thing to do. Start with your system parameters, i.e. how much flow do you want? How many outlets do you want? How will the pump get flow in and out?
There are basic rules you can use to help you
1. inlet MUST be 1/2 pipe diameter larger than outlet.
2. Suction line into the pump must be AT LEAST 7 pipe diameters straight with no fitings. Thus, if your inlet is 1", you should have at least 7" of straight pipe before you turn the line up, or before it reached its first fitting.
3. Design your system plumbing first. Fewer fittings is better. Once you have your sustem designed, figure the number of fittings and calculate the friction loss for the entire system. Here is a link to some friction loss tables for popular fittings
http://208.234.19.147/catalog/_pumps/friction.html
All this is to keep your system flowing the way you want it too. Pumps are pretty simple machines, but they operate a specific way. Too much back pressure on the outlet can kill the flow just like a restricted inlet.
Another thing aquarists tend to do is try to push water through the pipes at too high a velocity. The SCWD can handle a specific flow, above that, performance drops off, below that, performance drops off. To date, I have not been able to get any specific flow data from the guys at SCWD. It would probably be pretty costly to get that kind of testing done. Having a pump too big for your system is just as bad as having one too small, maybe worse. You can trash the pump, overheat the drive, etc by overworking it. You can also heat your water up quite a bit.
having 7 pipe diameters to the first fitting decreases the chances of cavitation and insures well distributed flow velocity and pressure at the inlet and throughout the pump and reduces the hydraulic excitations. 
Inshort, it makes the pump more efficent and more reliable. You don't have to follow this rule of thumb, but if your putting a new system together, its a good idea.
Inshort, it makes the pump more efficent and more reliable. You don't have to follow this rule of thumb, but if your putting a new system together, its a good idea.
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