how to make it quiet

I run a herbie and will NEVER go back. With a full siphon the flow is going to be much faster than the stand pipe is originally rated for.

 

After thinking about this abit I realised that most ppls overflows are overkill and I could run 2 herbies and I would be runninng them at their max NECESSARY flow rate. And I would still use 2 inch emergency drains ... now I hafta buy 2 gate valves ....I just ordered my other valves from usplastics darn coulda saved on the shipping

 

Sorry about my post... stupid predictive text on phone....

So what flow are you worried about?

Let's look at it this way... for a 100g tank a 1" overflow is plenty.... so dual 1" for a 210 is plenty.... yet you want dual 2" overflow.... double what you need. (actually a 2" pipe will flow more than 2x1" pipes) So let's say dual 1.5" Herbies.

Part of that 1.5" is restricted by the gate valve... so not true 1.5" flow... but there is no air so probably where you will have it set will be close to a 2" Durso (with air in it). Since you are going custom you do a 1.5" emergency drain.... total redundancy in drain capacity and you will never ever have to worry about a overflow.

Bottom line a 1" drain will do 600 gph... a 1.5" will actually do 1000 so you have 2000gph of flow for a 210.... and all you really need for your fuge and skimmer is half of that. Dude... your set.

 

Im a big proponent of excessive redundancy bc things have a funny way with me nd my luck. I already have the cutter for for the 2 inch schedule 80 bulk heads so ordering up 2 more bulk heads is cheaper and safer then ordering a new cutter nd 2 bulk heads.

 

You can look it up, but I would say a single two inch is plenty for two hundred. Duals would be redundant redundancy. You would be good to go.
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Yup that's the plan lol plus if for wat ever reasson I want to change the set up its easier to do with the holes already there

 

Crap Racer...so if you are ordering... you don't need 2 gates, you need one bigger one. For duals you can't adjust both cause you fight one or the other. You have to tie your dual mains into one bigger line and regulate that with a gate. You can still run the single emergency drains single into the sump and maintain all that drain capacity.

So tiing two 2" lines in to a single.... you will need to join them into a 2.5" line at least or possibly a 3" line so that single can handle all the capacity of the two singles.

Now realistically... with dual 2" drains.... you will have the gate valves closed say 1/3... a guess. So you are dealing with 2x2" drains flowing at 2/3s capacity. So you need to dump them into a line that can handle the combined flow of that. You just can't adjust two Herbie overflows with two valves and achieve any kind of consistency. All dual Herbie users ended up tieing them together and all was good. Does that make sense?