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Old 09-15-2011, 01:25 PM   #1
kds1398
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Default Chugger Pump inlet style

I've been looking @ purchasing one of the SS head pumps from them. I see all sorts of images on their site for a center inlet version of the pump.

My question to those of you who have both center inlet & the other inlet type (I guess side by side or top over bottom... not sure what to call it): What has been your experience with both styles? Is there a significant advantage for the center inlet? Is it worth it to wait until chugger comes out with the center inlet version?

I'm not really in a hurry, but I haven't heard when they are actually releasing them either.

What are the advantages/disadvantages of each version? From what I've read on the forums & product descriptions the center inlet has fewer cavitation problems & is easier to prime.


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Old 09-15-2011, 02:08 PM   #2
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I am also interested since the SS chugger pump is so affordable. Considering how many priming problems people had with march pumps due to orientation, I would like to hear how people orient their chugger pumps.

Has anyone used an auto air purge valve with the pump? I see pictures of march pumps with them and it couldnt hurt to have one on a chugger pump, right?

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Old 09-15-2011, 02:15 PM   #3
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The website is teasing me with all the center inlet images. I know that much.
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Old 09-15-2011, 05:39 PM   #4
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i only know on the march pumps that the "center inlet" versions offer a slightly increased flow rate over the side inlet model, apparently. that isnt necessarily related to the placement of the inlet though, could just be coincidence.

the basic design of the pump is the same for either orientation. they are all magnetic drive impeller pumps, so the fluid is dumped into the center of the impellar and the centrifical force pushes the fluid to the edge of the housing and exits the "out" port. all of these pumps dump the fluid into the center of the impellar. the only difference between a side input and a center input is that the center goes directly into the impellar, whereas the side input has a 90 degree bend before it dumps into the same area.

so theoretically, that 90 degree bend is where you would get restriction, and would be the only reason to use a "center inlet" over a "side inlet" pump. (how much "real world" difference you would see is debatable)
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Old 09-16-2011, 01:49 PM   #5
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The center inlet style pumps will have just over 1/2gpm more on the low speed pumps and just over 1gpm more then the inline style on the HS versions due to two things: First is what audger stated. The inline style forces the fluid to take a 90* bend before entering the pump. And it take another 90* when it gets whipped to the outside by the impeller... Second is the Center inlet style has a bigger ID then the inline style. The inline style has an opening of just under 1/2" where the center inlet style has an inlet opening of just over 9/16.

-Walter
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Old 09-16-2011, 01:53 PM   #6
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Quote:
Originally Posted by WalterAtMarchPump
The center inlet style pumps will have just over 1/2gpm more on the low speed pumps and just over 1gpm more then the inline style on the HS versions due to two things: First is what audger stated. The inline style forces the fluid to take a 90* bend before entering the pump. And it take another 90* when it gets whipped to the outside by the impeller... Second is the Center inlet style has a bigger ID then the inline style. The inline style has an opening of just under 1/2" where the center inlet style has an inlet opening of just over 9/16.

-Walter
If I'm not overly concerned about that bonus .5-1gpm, are all things fairly equal? What about cavitation? Is that less likely with center? Is priming easier?
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Old 09-16-2011, 02:09 PM   #7
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As long as the inlet side of the pump has a good size line feeding it, (1/2" ID or bigger) neither one should have priming or cavitation issues assuming there are no other restrictions due to elbows, or valves etc that may be smaller then the ID of the line you are using.

-Walter
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Old 09-16-2011, 02:18 PM   #8
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Does orientation make a significant difference? I see some setups with inlet on one side, output on the other an others that are vertical.

I'm also guessing that you end up with a bit extra wort loss that must be accounted for when the inlet stops draining.
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Old 09-16-2011, 02:18 PM   #9
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I have the inline version and priming has never been an issue. The only issue has been at near boiling temps the pump looses prime. So far it hasn't ruined any brew days (16+). Once the wert gets < 180F it works fine. I bought mine last December, old style.
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Old 09-16-2011, 03:15 PM   #10
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Quote:
Originally Posted by kds1398 View Post
Does orientation make a significant difference? I see some setups with inlet on one side, output on the other an others that are vertical.

I'm also guessing that you end up with a bit extra wort loss that must be accounted for when the inlet stops draining.
Well, I keep telling everyone that calls me that the outlet needs to be at the highest point to let all the air out of the pump head. If you kept the pump as is right out of the box, and placed it flat on a table in front of you, you would see the outlet is slightly higher then the pump body. You can clock the pump head every 90* to rotate the pump head if you wanted to mount the motor in a weird location. But just keep the outlet at the highest point. If you have long lines with a lot of slack in them then clock the pump head so the outlet is pointing straight up to the ceiling.
The next issue most brewers face is the lines running from the pump to the pot they are transferring to. If you have too much line, and you have a downwards dip before it goes up to the pot, then as you open the line and beer floods the pump head it will shoot through the pump and start to fill the output line. If you have that dip, and enough liquid gets in there, it can create an air trap situation between the pump head and the liquid sitting inside that low spot in the outlet line. Depending on how much head pressure you have, it may or may not be able to work all the air out of the pump head....and if not, when you go and start the pump up it will cavitate. Sometimes, if there is only small amounts of air in there, it will pass it and pump as normal...other times you may need to stop the pump...let the air rise to the top and start it up again.

-Walter


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