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Lecture 17

Lecture 17. Flat Structures. Aeration for Flat Structures. Ideally - uniform air flow  "dead zones"  min. of .2 cfm design rate (this is double) fines concentrate under filling auger... Duct pacing and storage    less than or equal to grain depth

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Lecture 17

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  1. Lecture 17 Flat Structures

  2. Aeration for Flat Structures • Ideally - uniform air flow •  "dead zones"  • min. of .2 cfm design rate (this is double) • fines concentrate under filling auger... • Duct pacing and storage •    less than or equal to grain depth •    longest air path should be less than or equal to 1.5 times the shortest path •  max. slope to grain = 10%

  3. Aeration for Flat Structures • Duct Sizing • number of bushels • airflow rate • design velocity • Positive vs Negative pressure • 2,500 fpm = positive • 1,500 fpm = negative

  4. Grain Sampling and Inspection •  Tell Tale signs •    leaking grain •    bulging walls •    snow melting off the roof •  Prevention of dead zones... •    perforated flooring best •    when ducts are used: probe "dead zones

  5. Preventing spoilage • Preventing spoilage •   perforated floor best, but fines accumulate below the floor - good spot for insects • checking "dead zones" • ducts can have fines accumulate, however cleaning and treating is much easier. • "core" in center of bin (where grain unloads) prevents air movement- spreader • probe areas where the probing is more difficult • filling and unloading leads to stagnant grain • Stirring devices • use of a vapor barrier • sealing bottom ring to concrete

  6. Sampling equipment needed • Moisture tester • Sampling probe • Temperature probe • Measuring tape • Grain dividers • Scale to weigh foreign material

  7. Getting a good sample • Divide bin into 5 equal parts • use probe • Sample each section

  8. Still concerned? • Fan test...Musty odor? • Corrective Action •    Insects - fumigate •    Wet - dry •    Hot - aerate • Note- Value of sampler greater than value of sample

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