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Old 11-13-2012, 01:39 PM   #11
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I have a mag 9.5 hank.
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Old 11-13-2012, 01:45 PM   #12
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I'm aware. I think just cutting it back with a ball valve will do it...though it'd be really cut back? I'm not aware of how it being drilled rather than hob overflow would effect things in terms of loss, but don't see where it'd be an issue.
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Old 11-13-2012, 01:59 PM   #13
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Quote:
Originally Posted by Sniperhank
I'm aware. I think just cutting it back with a ball valve will do it...though it'd be really cut back? I'm not aware of how it being drilled rather than hob overflow would effect things in terms of loss, but don't see where it'd be an issue.
Aren't HOB overflows forced with a pump? The drilled holes are strictly gravity, so will only drain as much as the return pumps actually return, and as long as the diameter of the drains can handle the return gph.
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Old 11-13-2012, 06:21 PM   #14
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Centrifugal pumps can run with the exaust valve full closed...No harm because of that.
Actually it will run freely.Ask about that to anny ship engineer.
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Old 11-13-2012, 07:24 PM   #15
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Yes...these pumps were all designed to see some "head pressure." Commercial pumps all have this marked on them. My main pump lifts the water from my basement to the upstairs reef, which puts a lot of restriction on the pump. It has been running 24/7 for the past 20 years with zero maintenance.
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