Herbie Question?

[mark]

As Todd said, you need two standpipes for a Herbie (primary and backup) as asking for flood without.

It's not that bulkheads flow less, just flow is balanced to return pump. Skimmin has Herbies, 2-1.5" drains, and flows ~2000gph so not like bulkheads running less (but must be closed to max'd for gravity).

[Kabong]

I got it.
So Technically it would probably work, But I'd just be begging for a flood without a back up pipe.

It's not that bulkheads flow less, just flow is balanced to return pump. Skimmin has Herbies, 2-1.5" drains, and flows ~2000gph so not like bulkheads running less (but must be closed to max'd for gravity).

According to the RC drain size calc you need a minimum 1.85" for 2000GPH Giving a difference of 1.15" So it's got a fair bit of spare.

Any one else running a Herbie setup could you give your drain size + your Aprox flow.

[untamed]

Originally Posted by Kabong

I got it.
So Technically it would probably work, But I'd just be begging for a flood without a back up pipe.

Any one else running a Herbie setup could you give your drain size + your Aprox flow.

Yes, you can silence a single overflow pipe using a gate valve and run a Herbie using only 1 pipe. But it would be stupid.

My system uses twin Herbies (4 actual drains). Each is 1.5". Flow of about 800-1000 gph through each side.

Here's an idea that might work. Add a second overflow pipe that comes up from your primary overflow pipe that will flow if the overflow box level goes too high. In the picture below, the red dot is your gate valve. You would need to get the height of this emergency drain just right.

Call this the "Untamed" mod.

[mark]

Another modified Herbie/Durso here

[untamed]

That was such fun that I designed another one. This is one that could be done with a single "through the bottom" bulkhead overflow drain. It is a bit wild, but I do think it would work and be safe.


(Mind you...if something blocks your only bulkhead, you've got a problem whether you've done this mod or not!)

Untamed Mod II:

[Chin_Lee]

MOD II would work quite well and in fact it will be almost identical to a toilet being flushed. The siphon would be quite strong once the flow starts to go over. If you don't put a strainer on your bulkhead, i can't see too many things that can block up a bulkhead other than a plastic bag or BIG fish.

Originally Posted by untamed

That was such fun that I designed another one. This is one that could be done with a single "through the bottom" bulkhead overflow drain. It is a bit wild, but I do think it would work and be safe.


(Mind you...if something blocks your only bulkhead, you've got a problem whether you've done this mod or not!)

Untamed Mod II:

[Phanman]

Nice work untamed. I think ill be doing this mod 2 on my build thats coming up in the next month or 2.

[Todd]

I think that this mod is limited in its ability to quiet things down because:

In order to have the 'back up' drain work, the top of it would have to be lower then the high water level in the skimmer box - in order for it to flow as water level rose. Meaning that you would have to have your water level in your overflow box lower then normal. Thus alot of the benefit to having a quiet drain would be removed because you would have a louder overflow.