who knows about flow?

[CMcNeil]

im trying to fing out how many gph that an opening of 15sq" will flow.or should i say how many gph will the openings allow to flow?

 

[ichthyman]

http://www.reefcentral.com/calc/drain.php

You'll have to work backwards.

 

[CMcNeil]

thanks

 

[CMcNeil]

for 2500gph it says 2.06 "diameter pipe,15sq"of openings is more suface area than a 2" pipe so i assume this would be enough overflow area to cover a dart as a return pump?

 

[Ah64av8tor]

Chris,

My overflow is 12" X 6" or 18 liner X 1" + tall (18sq"+a little) with most of the teeth cut out, it is plenty for the dart at a 5' head, with 3/8" to spare from the top of the teeth or 1/2" from the euro-brace.

15 sq" might be pushing it.

 

[guntercb]

Does someone have the theory/math behind those numbers in the drain calculator?

Thanks,
Chris

 

[mflamb]

I can tell you when I get home. I have a book on fluid dynamics.
It has the principles for water flow per psi per area.

 

[CMcNeil]

mike that would be great.im trying to figure out what size overflow cuts i will need to run a dart as a return pump for the 180.i have drawn them at 1"x5" with three slots so that gives me appox 15sq" of open surface.

 

[ReefArtist]

Velocity in feet per second = (0.408 x GPM) / Inside diameter of pipe in inches, squared

 

[CMcNeil]

uhhhhhhh yeeeeah. lol

 

[CMcNeil]

here are some pics of a sample joint i did tonight out of 1" thick acrylic

there are a few air bubbles but i found out i can get weld-on #42.it is a 2 part that is in one tube with a special mixing tip so no air.

 

[ReefArtist]

Are you thinking about going 1"?

 

[CMcNeil]

no 3/4" but i didnt have any laying around so i just used the 1" so i could do a big joint.

 

[mflamb]

Holy cow...building his own tank. Wow!!!

 

[CMcNeil]

i already priced out the sheet.i can make the tank for about the same price as the glasscages tank.plus i can do external everything plus easy drilling

 

[ReefArtist]

Oh did we forget easy scratching

 

[CMcNeil]

no i know it scratches easy,but any scratches can be buffed out.if you scratch glass you are screwed.

 

[mflamb]

Chris, I can't find anything in the fluid dynamics to help your overflow situation.
Have you considered a coast to coast external overflow?
http://reefcentral.com/forums/showt...36&highlight=coast+to+coast+external+overflow
http://reefcentral.com/forums/showt...64&highlight=coast+to+coast+external+overflow

 

[ReefArtist]

Well checkinhawk - I can tell you that in the 26 years I've had glass aquariums - never a scratch. You CAN buff out scratches in glass- I'm a glass artist and do this all the time. You just have to have the proper tools and know how to do it . Is it easy - no and not very many people scratch glass so the need isn't there to make the product for aquariums. Just like acrylic it also depends on the depth of the scratch - how easy/hard it is to get out.

 

[CMcNeil]

<a href=showthread.php?s=&postid=9716989#post9716989 target=_blank>Originally posted</a> by mflamb
Chris, I can't find anything in the fluid dynamics to help your overflow situation.
Have you considered a coast to coast external overflow?
http://reefcentral.com/forums/showt...36&highlight=coast+to+coast+external+overflow
http://reefcentral.com/forums/showt...64&highlight=coast+to+coast+external+overflow

mike that is basicly what i want to do for the overflow,but i dont want to cut them too big and have a low water level in the tank.