Return pipe at 90degree question

[linkedsilas]

my return doesn’t have a real straight path to get to my sump.
Is there any reason why a return pipe should not have a 90 turn into the sump. I have a Durso and holes are drilled at the top
Wanted to ask before I glue!
Thanks

 

[That Crusso Kid]

my return doesn’t have a real straight path to get to my sump.
Is there any reason why a return pipe should not have a 90 turn into the sump. I have a Durso and holes are drilled at the top
Wanted to ask before I glue!
Thanks

90's cut down on the flow back to the tank. Depending on the system size and return pump you're running, you may be fine with 1 or 2 90's. Again, depending on your system; any way to use flex PVC or flex PVC with a 45?

 

[Reef-junky]

I think Op is taking about the pipe going to the sump. Are you adding a run of horizontal pipe? It would be better to use 45’s and not have horizontal pipe if you can.

 

[eggplantparrot]

Whatever the case, BRS did a video that showed 90deg induced no real additional loss over 45deg and changing to 2 x 45deg did not yield more gph, so it does not matter if you use 90 or 45. Anytime a turn is introduced, flow will be decreased.

 

[Reef-junky]

It not flow it’s air pockets and the pipe being able to plug easier that I would worry about. On the return side from the pump it doesn’t matter but from the overflow. If it’s a small run you can get away with it but it’s better to have the pipe as vertical as possible.

 

[linkedsilas]

This is the pipe from the tank to the sump not the return pump
I’m aware of head pressure loss and will combat that with 45 degree turns
I was worried about air getting trapped in the 90 degree but it goes right into the sump under the water line
Not too worried about it but didn’t know if I was making a major faux pas

 

[Rjukan]

It's no biggie to have a 90* at the end of your drain line. The problem is when you have a 90* into a section of drain line that is horizontal. Normally if you're dealing with drains in the cabinet it's fine to run a little horizontal pipe because the drop from the overflow is able to push the water through with limited back pressure. It's when you run it for several feet or more that you will have a problem.