Did I screw up? Drain is limited

[hkgar]

I think

I recently moved my sump to the basement, and because of the amount of back pressure created by 8 feet of vertical and 15 feet of horizontal rums with about 14 90's

I have two Herbie style drains (two corner overflows) with 1" bottom bulkheads. These tee into a single 1" drain below the tank and than through the floor on the way to the sump.

I have an Iwaki 100 and should get 1345 GPH based on the calculator on the home page. If I push it beyond 800 gph the water level in the overflows begins to rise as if the system cannot take any more flow. The plumbing to the basement run through a drywall finished ceiling, so I will have to live with what I have.

Any ideas to get more flow within the limits I have spelled out?

 

[rynoe]

Having the drains tee into one is likely your issue. You should run two seperate drains all the way to the sump.

 

[Mark426]

I agree the about the "T". If you must use a "T" then I would up the pipe size after the "T". Second...fourteen 90 degree fittings is like a record! :fun4:

 

[hkgar]

In hindsight I know that, now. But can't change it without tearing out the ceiling.

Would replacing the tee, which is a 90, with 45's help any? How about increasing the size of the siphon hole. The water entering the sump has a tremendous amount of air.

Also I said they were Herbie drains, my mistake. The drains are Durso.

 

[billdogg]

even worse then. I have dursos and have for years. They are tried and true, but ONLY within their limitations. A 1" durso (which is what you effectively have even though you have 2 drains) is limited to a max of about 300gph. Even that is pushing it. Either dial your return pump way back or buy another pump closer matched to what you have. Neither is really a good way to go.

IMHO, the only fix is to redo it. If that means mucking up finished drywall, so be it. Convert to full siphon (herbie or BeanAnimal) and run separate drain lines.

 

[hkgar]

??????

I just check my flow and it is 960 GPH