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11-27-2008, 02:55 AM
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#1
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Swing the BIG hammer
Join Date: Oct 2007
Location: Minnesota
Posts: 2,432
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Awesome pump or crappy false bottom?
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I just finished a brew today and when I went to clean the hops out of my boil kettle I was surprised to find that my "Northern Brewer" domed stainless false bottom had been "sucked" into a concave form on either side of the dip tube. I was able to pop it back into place but wow.... either my march pump really sucks or the false bottoms from NB do.
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North Saint Paul Brewshack
Quote:
Originally Posted by jmendez29
Mom was right. Never argue with an idiot. They just drag you down to their level and beat you with experience.
Where's my beer. I know I left it around here somewhere.....
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Kegged/Drinking:Nihilistic Integrity - Black IPA, #1 BIAB pale ale, Bells Two Hearted - yes a keg of the real stuff
Kegged/Conditioning:Wally N Seans Braggot, Emerald Eyes - Irish Red, Atomic Tsunami - brown
Primary:empty
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11-27-2008, 03:20 AM
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#2
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Tactical Prattlarian
Join Date: Jan 2008
Location: Oblivion
Posts: 37,892
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I had one from MoreBeer work great for me for nearly 2 year and then POW collapsed. From that point on it would collapse under even the lightest of grain bills.
If figure that it was too weak to mess with anymore and bought a Sabco FB.
Life is too short to have to deal with a collapsed FB under 28# of grain.
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11-27-2008, 09:09 AM
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#3
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Senior Member
Join Date: May 2007
Location: Fallston, MD
Posts: 2,017
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Heard some horror stories regarding those types of FBs. Indeed, dealing with a collapsed FB is one of the less glamorous points of brewing.
The March pump is only 1/25HP and has max flow of 8gpm...doesn't create that much suction.  |
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11-27-2008, 10:16 AM
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#4
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Bier Jagdwaffe
Join Date: Feb 2006
Location: , native islander
Posts: 3,505
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The March pump can pump up to what 8-12 feet of head pressure or close to 2.5 pounds suction on the low end. A 12" false bottom has 113 sq/in of area if it's fully plugged with 2.5 pounds of suction your looking at 282.7 pounds of vacuum force not accounting for the wet grain weight pushing down.
No little 1/8" legs welded around the bottom for support preventing this problem or stainless 10-32 screws with nuts for support legs?
I have seen a 6,500 gallon stainless food grade tank collapsed from being pumped off with a broken vacuum brake stuck closed.
It looked like a hand crushed bier can a $94,000 316 ss tank wasted.
It doesn't take much pressure or vacuum to create a large force over a large surface area.
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Bier Jagdwaffe... Bier 30 zeit.....~~=o&o>..........
Last edited by BrewBeemer; 11-27-2008 at 10:18 AM.
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11-27-2008, 12:29 PM
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#5
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Senior Member
Join Date: Jun 2008
Posts: 1,413
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Why not add support feet/bars? Of you weld, would be easy as pie.
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11-30-2008, 08:04 AM
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#6
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Junior Member
Join Date: Nov 2008
Location: Louisville
Posts: 17
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Hmm original poster, are you using whole hops in your kettle? The rest, add a grant to run off from your mash tun, pump out of that, suction in the bottom of the mash tun is not good...
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Put to bed: Barleywine, Eisbock, Flanders Red, Kriek, Framboise, Brandy Barrel Mead
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11-30-2008, 02:58 PM
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#7
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Senior Member
Join Date: May 2007
Location: Fallston, MD
Posts: 2,017
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Quote:
Originally Posted by BrewBeemer
The March pump can pump up to what 8-12 feet of head pressure or close to 2.5 pounds suction on the low end. A 12" false bottom has 113 sq/in of area if it's fully plugged with 2.5 pounds of suction your looking at 282.7 pounds of vacuum force not accounting for the wet grain weight pushing down.
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I'll trust your math, but is that going to happen with a pump with a magnetically-coupled impeller that slips when it can't pump? |
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11-30-2008, 03:08 PM
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#8
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Senior Member
Join Date: Apr 2006
Location: Buda, TX
Posts: 448
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I've got a SABCO false bottom with the SS bolts as supports and that puppy has worked well with a lot of #s of grain on it so I would bet that it'd work well in a boil kettle with hops.
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runhard, trainhard, raceEZ
Jeffrey
keg 1-Graham Sander's Tropical Flower Wit
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keg 5-empty
Fermenter #1-Graham Sander's Tropical Flower Wit
Fermenter #2-empty
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11-30-2008, 04:31 PM
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#9
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Senior Member
Join Date: Aug 2006
Location: Piscataway, NJ
Posts: 19,414
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You can make legs out of some stainless machine screws and a couple nuts.
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11-30-2008, 04:55 PM
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#10
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Senior Member
Join Date: Jul 2007
Location: College Station TX
Posts: 2,369
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mine from NB started collapsing as well, so I put a hose clamp and washer over my dip tube on either side of my false bottom. Have not had a problem since.
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