overflow question

golf nut · #1 04-13-2009, 10:44 PM

If the Herbie style is a siphon type feed rather than a Durso type, providing the diameters are the same there should be substantial increase with the Herbie

Which exact pump do you have? may as well know its capacity to form an educated opinion.

mark · #2 04-13-2009, 11:00 PM

Quote:

Originally Posted by Mr OM

Which exact pump do you have? may as well know its capacity to form an educated opinion.

Don't think Canuck was looking for an opinion on the pump, just if a Herbie of the same diameter would flow the same/more/less.

e46er · #3 04-13-2009, 11:43 PM

never ran a herbie but took some physics years ago and it would tell me that a herbie (creating a full syphon with ZERO air) will drain much better than a durso style drain (air takes up space) a 1" durso gives you 600 gph a herbie style drain 1" would not surprise me if it was capable of 900-1000 gph(this was just a guess) i wish i went herbie style so its silent

Canuckgod420 · #4 04-14-2009, 12:37 AM

I guess the best way to know is to do it.
I'm re-doing my entire setup anyways....so good time as any.

sphelps · #5 04-14-2009, 12:57 AM

the main reason a Herbie flows more is head pressure, a standard durso or other standpipe operates at essentially zero head pressure while a Herbie has head pressure equal to the height of the overflow.

Out of curiosity why not share the model number of that pump?

Also when you branch of a line you don't look at it as a single system, for example, ignoring pipe friction, if you have two lines going up 8' you only have 8' of head pressure not 16'. So with your system you haven't analyzed it properly, you have less head pressure than you think.

golf nut · #6 04-14-2009, 01:05 AM

Quote:

Originally Posted by sphelps

if you have two lines going up 8' you only have 8' of head pressure not 16'. So with your system you haven't analyzed it properly, you have less head pressure than you think.

beat me to it, providing it is done properly.

Canuckgod420 · #7 04-14-2009, 01:21 AM

There is no model no on the pump...its an OEM replacement pump for a jetted tub.
The only thing that is on the pump is HP: 1/3. Jetted tub manufacturer, and pump manufacturer(Pentair). I called the tub maker, they in turn gave me the # to the people they talk to about their pumps, and I called them.

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?