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Old 02-26-2010, 10:30 PM   #1
jaobrien6
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Jun 2007
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So right now, I don't do any pumping of anything, and i've been doing some reading to learn what's what. One thing that confuses me is that the march pumps can't be run dry. So when you start pumping, i get that, you gravity prime it. However, what about when you're done pumping? I'm especially thinking about using it to pump out your mash/sparge water. You can't see when the liquid is going to run out, because of the grain bed, so how do you know when to stop pumping? Right now, I stop when the liquid stops flowing. If I'm pumping, though, and I wait for the liquid to run out, won't that damage the pump 'cause I'm now running it dry?

 
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Old 02-26-2010, 10:39 PM   #2
boo boo
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Not speaking from experience, but as I understand it, if you don't run it for a prolonged peroid of time, you should be OK. If you stop the pump when it starts to run dry ( you should hear the sound/pitch of the pump change ) there will still be enough lubricating water/liquid left in there to stop any harm from comming to the pump.
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Old 02-26-2010, 10:56 PM   #3
pickles
 
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Even after setting for a few months without running my pumps still have a bit of water in them. Just dont run them bone dry for any length of time.

 
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Old 02-26-2010, 11:26 PM   #4
willynilly
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"Dry" means BONE dry.

The pump uses the medium you are pumping for lubrication. As long as the impeller is "wet" it is lubed. They remain wet long after your brew session is over.

This is from experience, dont fear it.

 
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Old 02-26-2010, 11:28 PM   #5
jaobrien6
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Ok, cool. Thanks guys, that makes sense.

 
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Old 02-26-2010, 11:33 PM   #6
willynilly
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I would recommend the Little Giant pumps over the March any day though. Much nicer pump. The model 3-MD-HC are great for brewing.

 
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Old 02-26-2010, 11:36 PM   #7
MrH
 
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Yet another reason to get a Little Giant 3-MD-HC. They're rated for up to 8 hours dry running. I've run mine dry plenty of times and it's still running strong after 15 years...


MrH

 
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Old 02-26-2010, 11:43 PM   #8
willynilly
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They prime much easier than that March and have 2x the flow. They are spectacular.

 
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Old 02-26-2010, 11:55 PM   #9
BrewBeemer
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Quote:
Originally Posted by MrH View Post
Yet another reason to get a Little Giant 3-MD-HC. They're rated for up to 8 hours dry running. I've run mine dry plenty of times and it's still running strong after 15 years...


MrH
Just because March pumps are the only pumps available at your LHBS plus posted on many forums people believe this is the only pump that will work for home brewers. A bunch of sheep paying good money just to own a March pump. Open your eyes and expand the mind to alternative pump options, LG is a hands down winner in hp, flow as well a ball bearing vs a cheaper bushing motor. I see member MrH your running a LG pump for 15 years, i'm running one just past 3 years now at 24/7, I bet in total hours i'm running many more hours at 3 vs your 15 years brewing. This plus 100% trouble free, granted i've been inside it cleaning off algae once ot twice a year. At over 27,500 hours running time i'm quite happy with it no problems yet. The best deal was pulling off selling my two march pumps with one only used for less than 2 minutes, sold both for what I paid for them, lesson learned. Like electric element heating, back in 77 my journeyman friend was a homebrewer that had elements heating his brewery years before we became brewing friends. Nothing new just used all manual control switching and relays from job site dumpsters.
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Old 02-27-2010, 12:42 AM   #10
lustreking
 
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Quote:
Originally Posted by BrewBeemer View Post
Just because March pumps are the only pumps available at your LHBS plus posted on many forums people believe this is the only pump that will work for home brewers.
I think we know that the March 809 isn't the only pump that's suitable for brewing, but it is the least expensive suitable pump.
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