overflow question

[golf nut]

Originally Posted by Canuckgod420

Explain your theory on the head pressure please, it would be nice to know for sure.
The way I see it, if I tee off a pump(any pump) the flow coming from either end of the tee would be half of what the flow is straight from the pump...correct?

You did ask this question did you not?

He gave you the correct answer and some free advice, why the hostility?

What is so secret about an OEM pump, I am going to guess that this is an Emerson replacement.

[Canuckgod420]

The so called hostility stems from the jerk comment he made at the beginning of the post....I was merely responding to mykas post.

Theres nothing secret about the pump...its just not what the thread was about, and I have no interest in explaining anything more about the pump,and you are incorrect on the emerson replacement? what ever that means.

Never did I say I wasnt grateful for the head pressure calculation. I still have a hard time believing all that when I see how much loss I get from the pumps I run right now....for example....quiet one 4000HH claims 800GPH @ 6'....but on my return to my tank after 6' up and 2 elbows the flow is minimal. I guarantee I am not even getting 400GPH right now.

[golf nut]

In order to get the best you can from any pump you need to maximize pipe diameters, every little helps, sometimes seeing is believing and unless you have done testing it is hard to believe, try running your return pump into a container and based on time and gallons do the math.

Here is what is hard to believe.

Since the birth of Christ, a Trillion seconds have not yet passed, ... do the math.

[Jack]

The herbie is not a syphon and you will not drain more.

[sphelps]

Originally Posted by Jack

The herbie is not a syphon and you will not drain more.

like I said before it's about head pressure. Herbie will flow more

[Jack]

Have you used one?

I have, it won't drain more.

[sphelps]

yes I have. Comparing a standard standpipe to a Herbie with the same bulkhead size the Herbie will typically flow more. For example if your overflow is about 2 feet tall and you run a Herbie you have 2 feet of head pressure on top of your drain input to help push more flow in. With a standpipe you don't have this. Just like running a pump at zero head compared to 2 feet of head, but it works in an opposite fashion with a drain, more head pressure will mean more flow.

Of course I say typically because for this to work you have to have the primary drain located at the bottom of the overflow and not have any kind of extension tube, otherwise you don't have the head pressure to push more flow. To demonstrate try an experiment, fill an old tall container will water and punch a small hole in the side near the bottom and you'll see a jet of water spray out. You'll notice as the water level decreases, which reduces the pressure at the hole, the water jet will not spray as far.

You can also note that the primary reasoning for a Herbie is noise reduction not increased flow. The idea is the system can take a large amount of flow and drain it whisper quiet.

[sphelps]

Originally Posted by Mr OM

Here is what is hard to believe.

Since the birth of Christ, a Trillion seconds have not yet passed, ... do the math.

Every year 100,000,000 sharks are killed by man