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Author Topic: Drying thick pecan in Nyle L200  (Read 1818 times)

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Offline KenMac

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Re: Drying thick pecan in Nyle L200
« Reply #20 on: February 13, 2021, 10:27:28 AM »
If customer is unwilling to pay for fungicide I'm curious what you are charging for kiln drying for a few of months? How many Bf is in the kiln? Are you charging by the BF of by the amount of time? I wish you all the best but I don't see this ending well.
I guess it's hard for anyone to understand why I'm doing this and I get that. My kiln has sat idle for several years waiting until I got a mill to put it back to use. That plan hasn't panned out either since the only customers interested in drying lumber only had a few board feet. I currently have no place to store dried lumber, so I haven't sawn lumber to stock. This opportunity (or travesty) came along and it just felt right to do. Maybe it's Divinely inspired, or not, but it just seems like something I need to do for the owner. We will both learn a lot and hopefully he will get enough usable wood to build what his wife wants from this majestic tree from her family's homestead. (Her description).
 My sawmill operation does not have to provide a living for me. I'm certainly not rich but I've found that I can be happy with SSI. My mill does allow me to have the tools and goodies that I need (want). 
 The owner is going to pay all expenses related to drying his wood and we will settle up for my time at some point. This whole endeavour is an experiment I guess. Had I been more in the know I would have suggested air drying first, but after the kiln was loaded the owner wants to leave it as is and proceed as best we can. I know no one in his right mind would take on this project but I'm content with it. I've never been accused of being in my right mind, :) By the way there are 17 4x4x12's and 7 3" slabs 25" or so and 2 2" slabs about 18" wide, all 12' long. He said 1800 bf. I haven't tried to figure it up.
 Besides, y'all need someone to criticise and ridicule. Maybe that's my biggest contribution to the Forum! I'm ok with that. :D I do appreciate everyone's interest and advice.
 I was wondering if Clorox would damage the wood if used to kill mold? Any ideas on that?
Ken
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Re: Drying thick pecan in Nyle L200
« Reply #21 on: February 14, 2021, 11:48:45 AM »
Ken, based on your most recent post I think that I would reduce the kiln temp to 70f in order to further slow down the drying rate and also to retard the development of mold. 

Id probably keep the RH% above 90, ad make sure that I had no more than 200 FPM of air flow thru the stacks and 100 FPM would be better.

In a few months when the ambient temps outside start getting warmer, increase the kiln temp to 80 and a month or so later back up to 90.

Mold will be less of a problem in a few months after the wood has dried part way, and 70f will result is less mold development as well as a very slow drying rate at the present time, which is what you need.
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Offline KenMac

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Re: Drying thick pecan in Nyle L200
« Reply #22 on: February 14, 2021, 01:25:11 PM »
Ken, based on your most recent post I think that I would reduce the kiln temp to 70f in order to further slow down the drying rate and also to retard the development of mold.

Id probably keep the RH% above 90, ad make sure that I had no more than 200 FPM of air flow thru the stacks and 100 FPM would be better.

In a few months when the ambient temps outside start getting warmer, increase the kiln temp to 80 and a month or so later back up to 90.

Mold will be less of a problem in a few months after the wood has dried part way, and 70f will result is less mold development as well as a very slow drying rate at the present time, which is what you need.
Thanks for your advice once again. The controller on my kiln has a low setting of 80 degrees for the compressor to operate, but I can leave it off and just run the fans with a separate heat source as needed to maintain 70 degrees. The 4 heat lamps should easily do that. RH has been above 90% since first checked, so hopefully that won't be an issue. Thanks again for understanding and being willing to help.
Cook's AC3667t, Cat Claw sharpener, Dual tooth setter, and Band Roller, Kubota B26 TLB

Offline KenMac

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Re: Drying thick pecan in Nyle L200
« Reply #23 on: February 20, 2021, 06:15:49 PM »
As an update to my ongoing saga, I turned the compressor and heater off on the 15th I think it was. The temp then was 93 and rh was 91ish. Fans were left on as recommended. As of 3:00 pm today the temp is 73 and rh is 93%. The stack has shrunk about 1/4 inch with no visible splitting or degrade yet. Mold seems to be no worse.
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Re: Drying thick pecan in Nyle L200
« Reply #24 on: March 28, 2021, 04:46:39 PM »
To update my load of pecan:
After turning all heat sources off and leaving fans (2) running the temp came down to 76 after several days while RH has stayed above 90%. Now the temp is back up to 84 and RH is 91%. My Electrophysics moisture meter shows readings of 99% to about 86% but may well be inaccurate even though Electrophysics says it is accurate to 99%.
Wood shows no visible degrade at this time, but stack has lowered about 3/4". Previous mold is no worse. Thanks again to everyone who gave advice on best way to proceed.
Cook's AC3667t, Cat Claw sharpener, Dual tooth setter, and Band Roller, Kubota B26 TLB

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Re: Drying thick pecan in Nyle L200
« Reply #25 on: June 19, 2021, 04:24:12 PM »
Just to update my saga of pecan slabs in my kiln: I have monitored kiln temp and RH since January and as outside temp has risen so has kiln chamber temp. As of this morning temp was 96.8 and RH was 82.4. RH is consistently dropping .1 to .2% a day. The slabs and 4x4's show no sign of degrade at this point and stack has shrunken in height by over an inch. I do not know MC of wood at this point, but am going as slowly as possible. I'm thinking that soon I will turn compressor on for about 5% of the time and try to move the process along. I am going to try to get an MC but am uncertain if it will be realistic. My Electrophysics moisture meter claims to read up to 99%, but I doubt its' accuracy. We'll see how this goes. Thanks again for all of the advice and please keep it coming when you think I should do differently than my plan.
Cook's AC3667t, Cat Claw sharpener, Dual tooth setter, and Band Roller, Kubota B26 TLB

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Re: Drying thick pecan in Nyle L200
« Reply #26 on: June 20, 2021, 11:43:02 AM »
I would recommend a Delmhurst J2000 moisture meter. Need to know what your moisture is to be able to give the best advice.
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Re: Drying thick pecan in Nyle L200
« Reply #27 on: June 20, 2021, 08:02:09 PM »
I would recommend a Delmhurst J2000 moisture meter. Need to know what your moisture is to be able to give the best advice.
I have the Delmhorst J2000 but it only reads to 36 or so percent I think. Even if the Electrophysics (which I bought from Nyle with the kiln) is inaccurate I thought it would possibly show a rate of decrease in MC. That was my thinking anyway. Thanks for your input.
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Re: Drying thick pecan in Nyle L200
« Reply #28 on: June 25, 2021, 08:30:40 PM »
Even though I figured I'd be wasting my time, this morning I checked the pecan slabs and 4x4's with the Delmhorst J2000 meter. To my surprise with the hammer pins driven in completely it showed the slabs to be in the 19% range and the 4x4's at 22.2 to 23.6%. There has been no heat or compressor running since the first week the kiln was loaded. I can see no cracking or degrade on any piece. Granted I can only check exposed areas but I never imagined MC would be this low. Temp is 97 and RH is 81.6%. I'm thinking I should let it ride as is for a while longer even though I'm tempted to run compressor at 5%. Anyone have a suggestion on what to do now? Thanks in advance for your input.
Cook's AC3667t, Cat Claw sharpener, Dual tooth setter, and Band Roller, Kubota B26 TLB

Offline WDH

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Re: Drying thick pecan in Nyle L200
« Reply #29 on: June 26, 2021, 07:04:50 AM »
I would run the compressor some.  Likely the core moisture is higher but you could ramp the drying up one notch.  
Woodmizer LT40HDD35, John Deere 2155, Kubota M5-111, Nyle L53 Dehumidification Kiln, and a passion for all things with leafs, twigs, and bark.  hamsleyhardwood.com

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Re: Drying thick pecan in Nyle L200
« Reply #30 on: June 26, 2021, 07:12:49 AM »
Also check your moisture meter and make sure you have it set for insulated pins when using the hammer.
Two LT70s, Nyle L200 kiln, 4 head planer, 30" double surface planer, Lucus dedicated slaber, Slabmizer, and enough rolling stock and chainsaws to keep it all running.
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Re: Drying thick pecan in Nyle L200
« Reply #31 on: June 26, 2021, 05:44:10 PM »
Also check your moisture meter and make sure you have it set for insulated pins when using the hammer.
Thank you. I will check that and recheck Monday.
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Re: Drying thick pecan in Nyle L200
« Reply #32 on: June 28, 2021, 05:43:19 PM »
Well, I have determined that either I am not blessed with the Delmhorst smart gene or the J2000 is not intuitive or user friendly. To the best of my ability I set the meter for insulated pins and checked several slabs and 4x4's. MC ran from 22.3 to 23.6. I am still surprised at this but I guess it is true. My plan is to start compressor at 5% for a while and monitor unless you kiln guru's advise otherwise. 
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Re: Drying thick pecan in Nyle L200
« Reply #33 on: June 30, 2021, 05:22:12 AM »
What part of the slabs are you sticking the meter? How deep are you driving the pins?
Two LT70s, Nyle L200 kiln, 4 head planer, 30" double surface planer, Lucus dedicated slaber, Slabmizer, and enough rolling stock and chainsaws to keep it all running.
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Re: Drying thick pecan in Nyle L200
« Reply #34 on: June 30, 2021, 07:09:21 PM »
What part of the slabs are you sticking the meter? How deep are you driving the pins?
I'm checking exposed areas on the surface obviously near the edges. Some are on the air inlet side and some on the outlet side. Pins are driven in as far as possible- to the connector. Thanks for responding. Checked a second time and readings were very similar with one slightly higher and the rest slightly lower- maybe 0.2 either way.
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Re: Drying thick pecan in Nyle L200
« Reply #35 on: July 01, 2021, 06:04:35 AM »
When drying slabs I like to have a couple of a places where a narrow slab is above a wider one. This lets me check closer to the core in the face of the slab. I find that the edges and ends dry faster than the core. Try to have your probes in heart wood as it will normally read higher than sap wood. Also be careful driving the pins in all the way. Your meter might be reading the surface moisture if the face is making contact with the lumber. I only go in about half the thickness of the slab.
Two LT70s, Nyle L200 kiln, 4 head planer, 30" double surface planer, Lucus dedicated slaber, Slabmizer, and enough rolling stock and chainsaws to keep it all running.
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Re: Drying thick pecan in Nyle L200
« Reply #36 on: July 01, 2021, 08:13:39 PM »
Thanks Jake. I will alter my process and keep checking. Is the Relative Humidity reading reliable in telling MC at this point or is that only applicable after drying is pretty much complete? 
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Re: Drying thick pecan in Nyle L200
« Reply #37 on: July 03, 2021, 10:57:25 AM »
It tells you the drying force on the outside of the slab, not what is inside.  
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Re: Drying thick pecan in Nyle L200
« Reply #38 on: July 03, 2021, 02:07:47 PM »
It tells you the drying force on the outside of the slab, not what is inside.  
Thank you Mr. Hamsley. I'm slowly learning this stuff, but will probably never get proficient at drying or sawing. :-[
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Re: Drying thick pecan in Nyle L200
« Reply #39 on: July 03, 2021, 05:48:51 PM »
Doing is how we learn best. 
Woodmizer LT40HDD35, John Deere 2155, Kubota M5-111, Nyle L53 Dehumidification Kiln, and a passion for all things with leafs, twigs, and bark.  hamsleyhardwood.com


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