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Old 09-12-2003, 04:03 PM   #11
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not sure.. if the holes are 1" and 3/4"... does that mean you'll be using 3/4" and 1/2" pipe for your plumbing? the size of the pipe will determine the flow rates you can expect... and IMO the pump should always rate under your drain flow rate but 10-20%

IOW, if you had justDIY's 1200gph of drain flow rate I wouldn't go any higher than a total of 960 GPH return.

found anoter pic on that durso page that looks a LOT like your situation...

http://www.rl180reef.com/pages/stand...e-einstein.htm
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Old 09-12-2003, 04:17 PM   #12
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If I have 1 inch drilled holes, wouldnt that mean I would have 1 inch pipe? Or not nessasarilly?
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Old 09-12-2003, 04:29 PM   #13
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IIRC, pipe is measured by it's inner diameter. so a 1" pipe is actualy going to need a hole bigger than 1" in order to fit through it...

thats why i was thinking they would actualy be plumbed for 3/4" and 1/2" to fit the 1" and 3/4" holes... (asuming 1/8" thickness pipe wall)

is that right? anyone have some pipe and a ruler on hand?
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Old 09-12-2003, 05:15 PM   #14
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a 1" hole would accomidate a 1/2" bulkhead

a 1.25" hole accomidates a 3/4" bulkhead

a 2.58" hole accomibates a 1.5" bulkhead

IF you tank holes are actually that small, then you're in trouble! double check your measurements.... how big is this tank again?
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Old 09-12-2003, 10:47 PM   #15
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O.K. I went and measured the holes, the back 3 are 1 3/4 inch and the front two are 1 1/2 inch.

The tank is 150 gal
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Old 09-12-2003, 11:36 PM   #16
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hmm

those sizes seem "odd"

here's a link to "standard" pvc bulkhead sizes

http://www.plumbingworld.com/bulkhead.html
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Old 09-12-2003, 11:50 PM   #17
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I think I found what I need, tell me if I'm wrong.

1" Thread x Thread 1-3/4" Hole $7.50
3/4" Thread x Thread 1-1/2" Hole $6.75

I found these at www.marineandreef.com
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Old 09-13-2003, 12:14 PM   #18
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cool beans - sounds like you're good to go
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Old 09-13-2003, 05:44 PM   #19
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How about the size (gph) pump I need for my setup?
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Old 09-13-2003, 08:30 PM   #20
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will you have powerheads too, or do you want the main pump to do everything?

aim for 1200+ if you're going to have powerheads, or 2000+ if you want the main pump to do it all.
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