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Old 12-01-2012, 06:27 PM   #1
spittingglass
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Default Mash tun cooler conversion/screen question.

I picked up a 10-gallon cylindrical rubbermaid cooler for Home Depot and put a weldless ball valve on it with a torpedo screen; the problem being, the torpedo screen didn't fit completely and I had to bend it a bit to make it lay mostly flat on the cooler bottom. Will this kink have an effect on performance? Pictures:

Top-down view:


Side view 1:


Side view 2:

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Old 12-01-2012, 06:29 PM   #2
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Anything sticking up will suck air before the wort is all out, losing the siphon. So I'd try to crimp the end, rolling it up, so it lays as flat as possible on the bottom instead of sticking up.

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Old 12-01-2012, 06:43 PM   #3
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Mine is the same way.
You need to bend, it but it needs to curl around the edge.

Don't worry about loosing siphon though. It's a screen and enclosed suction ends where the screen starts.
You can't maintain suction through a screen.

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Old 12-01-2012, 08:43 PM   #4
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Mine is the same way.
You need to bend, it but it needs to curl around the edge.

Don't worry about loosing siphon though. It's a screen and enclosed suction ends where the screen starts.
You can't maintain suction through a screen.
Didn't see this until I'd already enacted Yooper's advice, the screen is beyond that now; I bent and flattened it over with a channel lock:

Top-down:



Side 1:



Side 2:




Going to start grinding grain in a few minutes, I'll report back how she flies after the mash.
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Old 12-01-2012, 08:45 PM   #5
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Yes, that should work.

I don't know the reasoning behind 45_70s response, but in my experience when a bazooka sticks up, it starts sucking air before the wort is completely out, and breaks the siphon. Maybe it's not a true siphon, but I think it is. I've had that issue a number of times with a bazooka tube in my BK. Once you get to where the top is exposed, and start sucking air, the flow will stop. But if you keep it as low as possible, you'll get maximum extraction.

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Old 12-01-2012, 09:06 PM   #6
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As long as the bottom of the nipple that the screen is clamped to is lower than the liquid level, and the grain bed permits flow, it will flow fine.
You cannot get a siphon through an open screen.
If you have a spare bazooka screen, try placing half of it vertically in water and try sucking water through it.

Either way, you want as much surface area of it in the bottom of the tun as possible.
The more screen down low you have, the less chance of a stuck sparge.

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Old 12-02-2012, 12:50 AM   #7
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Worked like a dream. 80% mash efficiency, missed BeerSmith's predicted gravity by .002. Thank both of you for being awesome!

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Old 12-02-2012, 02:11 AM   #8
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I'm glad it worked out for you.

Now if I can find time to brew in the next couple days life will be good here also.

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Old 12-02-2012, 02:27 AM   #9
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I've used this screen without modification inside a round 10 gallon cooler before. You probably could have gone with the 6" version of the one you modified too.

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Old 12-02-2012, 02:40 AM   #10
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Quote:
Originally Posted by spittingglass View Post
I picked up a 10-gallon cylindrical rubbermaid cooler for Home Depot and put a weldless ball valve on it with a torpedo screen;.............]
PM me if you want a domed false bottom for that rig. Just upgraded some stuff and don't need it. You can get it for postage.
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