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larrysand
Joined: 13 May 2016 Posts: 25
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Link Posted: Mon Apr 01, 2019 3:58 pm Post subject: MLT flow rate through 50' 1/2" ID HERMS coil |
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I'm testing my build with water and am interested to know if anyone has measurements of re-circulation through a 1/2" ID 50 foot coil with the thick 1/2" ID silicone tubing and full bore camlocks and ball valves? I measured an average of 1.2 gallons per minute with a head of 1.5 feet.
The reason I'm asking is that i have to have the HLT about 3 degrees F higher than the MLT to maintain the mash temp. HLT flow rate is about 6 GPM.
Thanks.
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11121 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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larrysand
Joined: 13 May 2016 Posts: 25
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Link Posted: Mon Apr 01, 2019 4:15 pm Post subject: |
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Thanks Kal,
I've done everything on the list.
I have not tried to mash yet. Just testing with water and everything stabilizes. So I was wondering about flow rates. I don't use your quick disconnects but big C camlock should have less restriction.
It's not a big deal because i can measure it and compensate the process.
Thanks again,
Larry
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larrysand
Joined: 13 May 2016 Posts: 25
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Link Posted: Mon Apr 01, 2019 4:16 pm Post subject: |
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I use thermapens. I love those things and give them as gifts all the time.
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11121 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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Link Posted: Mon Apr 01, 2019 10:03 pm Post subject: |
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larrysand wrote: | I've done everything on the list. |
Well then that's curious! It's a question that's been asked often enough that I've compiled the list to help people who are curious why there's a difference. If you've done everything on the list then it has to be something not on the list. If/When you find it, please let me know what it was and I'll update the list.
So just to be 100% sure, you are:
- Using the same March pumps with center inlet heads I recommend and not something else?
- Using the same thicker hoses with 7/8" outer diameter I recommend and not 3/4" outer diameter?
These seem to the two that make the difference for others. Most people go with cheaper pumps. Very few sellers sell 7/8" OD hose.
You do have different disconnects but I doubt that makes any difference.
Quote: | big C camlock should have less restriction. |
Why?
Kal
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dp Brewing Company
Joined: 08 Jul 2013 Posts: 664 Location: Midwest
Drinking: Chocolate Taco, Raspberry Mango Cider, American X, Sandy Dunes
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Link Posted: Tue Apr 02, 2019 12:04 pm Post subject: |
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Big C camlocks have a larger bore. I think that is what he meant about less restriction
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11121 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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dp Brewing Company
Joined: 08 Jul 2013 Posts: 664 Location: Midwest
Drinking: Chocolate Taco, Raspberry Mango Cider, American X, Sandy Dunes
Working on: Nothing
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Link Posted: Tue Apr 02, 2019 12:25 pm Post subject: |
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kal wrote: | Thanks - that's what I figured he meant. For what it's worth my QDs are not full bore and I've never had issues with flow rate. Having full bore certainly won't hurt anything however.
Kal |
I think your QD's have a larger bore than the standard Camlocks. That is if you use the two fittings on the female side like you do. The QD's that have the barb on the female side have a smaller bore than camlocks do.
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larrysand
Joined: 13 May 2016 Posts: 25
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Link Posted: Tue Apr 02, 2019 7:23 pm Post subject: |
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Yes, DP is correct. I was just looking for a cause. I will let you know what I find out.
Larry
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dp Brewing Company
Joined: 08 Jul 2013 Posts: 664 Location: Midwest
Drinking: Chocolate Taco, Raspberry Mango Cider, American X, Sandy Dunes
Working on: Nothing
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Link Posted: Tue Apr 02, 2019 7:50 pm Post subject: |
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This is a long shot but see what your PID values are at. Kal gave me a baseline to start from and then do the auto tune. Worked wonders for mine being off by about 2 degrees and the HLT overshooting set temps.
P 40
I 350
D 2
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11121 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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larrysand
Joined: 13 May 2016 Posts: 25
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Link Posted: Tue Apr 02, 2019 10:21 pm Post subject: |
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DP,
The PID is set to those default values and the HLT does not have any trouble maintaining it's temperature. I calibrated the RTD with my thermapen.
Thanks,
Larry
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dp Brewing Company
Joined: 08 Jul 2013 Posts: 664 Location: Midwest
Drinking: Chocolate Taco, Raspberry Mango Cider, American X, Sandy Dunes
Working on: Nothing
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Link Posted: Wed Apr 03, 2019 12:12 pm Post subject: |
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larrysand wrote: | DP,
The PID is set to those default values and the HLT does not have any trouble maintaining it's temperature. I calibrated the RTD with my thermapen.
Thanks,
Larry |
Could you possibly post up a photo of your system? I would like to see where your temp probes are at and curious if you checked the temp with your thermapen at that spot or somewhere else.
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larrysand
Joined: 13 May 2016 Posts: 25
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Link Posted: Fri Apr 05, 2019 7:58 pm Post subject: |
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The temp probe is exactly as in Kal's build, Kettle, Valve, close nipple, T.
Anyway the problem was several things. My space is on the cool side, about 65F. I had the kettles sitting on a terry towel on a stainless table and the towel was wet. I upgraded that to something better and replaced the thrust washer and impeller in the pump. That took care of the problem.
Thanks,
Larry
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