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Dry Kiln Control / Re: Sizing vents
« Last post by HencoV on April 20, 2014, 07:29:38 AM »
Rule of thumb: 0.03 square meter vents per cubic meter for softwood kilns. The total venting capacity is more important than size configuration....even more important is to have absolute control of the venting strategy.
Dry Kiln Control / Sizing vents
« Last post by SKieling on April 18, 2014, 04:26:20 PM »
I had the opportunity to talk to some folks recently who dried southern yellow pine. The subject of venting came up. They use only a few large vents on each side of a double track kiln. All the double tracks I've seen in the northwest, have several per side. It raises the question of what is better, a few large vents or several smaller ones. For example, would four 24"x60" vents be any more or less effective than ten 24"x24" or twenty 16"x18" ? We dry both DF and HF with conventional schedules, no high temp ones.

Drying Defects / Re: End of Log Sealing
« Last post by HencoV on April 13, 2014, 10:49:02 PM »
I have recently started up my micro sawmill, where I cut ± 30m3 per month of Euc. saligna, and dry it in my Hybrid kiln. Saligna is known to end split within hours to days after felling. I started experimenting with end coats with great success. I started with roof sealer paint directly after felling. It reduced the number of end splits forming, and exiting splits did not increase in size very quickly. I found roof sealer paint to be a bit expensive for the job, and are currently using a mix of cheap contractor PVA and tile adhesive in a ratio of 20litre PVA : 500ml tile adhesive. This works out about 1/3 the price of roof sealer, and looks like it is working.
Stacking/Sorting Wood / Re: Using Weights for Wood Stacking
« Last post by bmason on April 10, 2014, 08:02:20 AM »
We are located in south-east BC and dry some of our products down to 12-13% MC.  We use kiln weights on these products and it shows great results.  On another note, we have not been successful using weights over the winter months as it poses a huge safety concern with the weight being very unstable on the frosted/icy top tier.  We are going to try banding the weights to the load......any other creative ideas out there?
General Discussion / Ganged Coils in Kilns
« Last post by PaulBallard on April 04, 2014, 04:04:14 PM »
For those who have ganged coils in your kilns, have you been noticing corrosion eating out the bottoms of your coils?
Job Postings / Boiler Operator - Gaston, OR
« Last post by admin on April 04, 2014, 02:37:56 PM »
 Boiler Operator

Tracking Code
Job Description

    We are seeking a Boiler Operator with a commitment to safety and possess great problem solving skills. You will execute your role within a group that embrace innovation, continuous improvement and provides educational opportunities to continuously sharpen your professional skills.  Our boiler operators play a key role in operating and maintaining our high pressure wood fired boilers through excellent team work and focused execution.

    Your accountabilities…

        Utilize your knowledge of steam, instrumentation and controls to efficiently and safely operator our high pressure wood fired boilers
        Change kiln charges and operate them with our controls
        Understand environmental compliance related to operating and repair boilers
        Perform repairs and maintenance to boilers and related equipment as needed
        Proactively communicate with all departments to build and maintain working relationships to achieve department and plant goals.
        Identify and suggest new approaches or best known methods to foster our continuous improvement mentality

Required Skills

    Your qualifications…

        A minimum of 1 year experience operating a high-pressure wood fired boiler
        Proven experience or expertise in the following technical areas:
            Boiler instrumentation and controls
            Kiln operations
            Welding and mechanical skills
            Steam and opacity reading (preferred)

        An understanding of environmental compliance related to boiler and kiln operation
        Excellent verbal and written communication skills
        Team player and highly self-motivated individual
        Ability to operate rolling stock, including forklift certification

For More Information, Click Here and look at post number 280

NOTE: Job postings on are provided as a free service. We do our best to keep all postings current. However, if you discover a job listed on our forum is no longer available, please send us a message to that effect and we will remove from the board. Thank you.
General Discussion / Will the presence of amine discolor or stain lumber?
« Last post by bmason on April 03, 2014, 10:58:31 AM »
As the title states, we are looking at implementing a neutralizing amine as a corrosion inhibitor in our steam system; the system does have steam injection.  One of our water treatment suppliers has mentioned past experiences of lumber that was dried with the presence of amine being somewhat discolored, even after it has been planed.  The bulk of our business is high quality/high value products headed into the Japanese market, so color and appearance are very important.  Does anybody have experience (both good and bad) in dealing with this product in steam systems where steam injection is present?


General Discussion / Re: Proportionate venting
« Last post by HencoV on April 03, 2014, 07:36:23 AM »
After spending ± 200 hours with this kiln, I believe I fully understand what proportionate venting is about.

The controls on this kilns has many fancy settable features. In what seems to be fail safe mode, where the controls uses and average of dry bulb probes (on the enter and exit side of the stacks) to control temperature, and the average of RH sensors (on the enter and exit side of the stacks) to control humidity, the kiln controls according to the schedule "sort of"....running on EMC variance of -0.5% to +1.0% around set point. This way of control however, is not ideal or optimal, because in an attempt to reach average values, the condition of air entering the stack is extremely harsh. eg. trying to control on 85 Deg C with EMC of 5.6%, the actual condition of air entering is pushed to 95 Deg C + and EMC of ± 3. Especially during the beginning of drying this will only stuff up pine. There is a setting to have the kiln control the conditions based on the condition of air entering the stack, using only the probes on that side when fan direction is blowing into the stack. However, some fail safe internal programming causes the main steam to close when EMC goes too high. Of course after direction change, and now using the probes on the other side of the stack, from which the fans now blows, it is normal for EMC to be high for a few minutes....the main steam closes, vents open, temp drops and of coarse this causes EMC to increase even further. The result--the kiln shuts down due to a "too high EMC reading". Of coarse the local distributor of the kiln has never come across this, as they always set the kiln to use average values to control.

For complete and accurate control, you cannot use the average readings of probes on the opposite sides of a stack to control (air enter side and air exit side)...this renders the accuracy of modern control systems useless. 

To conclude: After sending all my findings, graphs and comments to the kiln supplier, and not getting a proper response in roughly 5 weeks, I can only conclude that they either just don't give a damn, or they don't understand the fundamentals of drying. The control is fancy enough to baffle with brilliance. It just lacks one thing and that is to actually control the drying process efficiently.

The Quebec Forest Industry Council (QFIC) Drying Workshop will take place in Quebec City on May 1st and 2nd. Exceptionnally the workshop will be preceded with a tour of the Hydro Quebec and Fpinnovations Experimental kiln and Lab in Shawinnigan on April 30th.

Great venue of speakers such as Steve Riley,  SCION, New Zealand Forest Research Institute and Bill Smith, State University of New York.
Registration and program on QFIC web site.

Ateliers-conférences sur le séchage du bois - 20e édition - Événements - Nouvelles et événements - Conseil de l'industrie forestière du Québec

Info contact Denis Rousseau 418-657-7916 ext467
Training / Events / 2014 NC State Dry Kiln Operator's Short Course
« Last post by admin on April 01, 2014, 10:24:19 AM »
May 13 - 16, 2014
North Carolina State University
Raleigh, North Carolina

This short course will provide practical knowledge about how lumber is effectively kiln dried and scientific background on related wood properties and processes.  It will have value for the beginner as well as experienced kiln operators and with supervisors, sales, and marketing personnel.  Instruction, by university faculty and industry experts, will be both in the  classroom and through hands-on lab exercises using our 1000 BF steam heated dry kiln.

For more information call or email Phil Mitchell at 919-515-5581,
Or, copy this link into your browser to download the brochure:
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