weight of pellets for a given volume?

wi-dogfish Posted By wi-dogfish, Sep 10, 2008 at 11:52 PM

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  1. wi-dogfish

    wi-dogfish
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    Jul 2, 2008
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    I would like to take a trailer and fill it full of softwood pellets . It's 5' x 8' x 22" tall. Can someone please tell me how much this load will weigh. Or just how much a cubic foot of pellets will weigh?

    Thank you very much.

    I've done some searching and couldn't find anything.
     
  2. DiggerJim

    DiggerJim
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    Jul 29, 2008
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  3. imacman

    imacman
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    Are you talking about filling it with loose pellets, or 40lb. bags?

    The pellets alone in that trailer, if they were loose and filled to the brim, would weigh 1 1/2 tons. Better make sure the Gross trailer weight can handle that plus the weight of the trailer too.
     
  4. wi-dogfish

    wi-dogfish
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    Thanks a lot. I can fill my trailer 3/4 full.
     
  5. BrownianHeatingTech

    BrownianHeatingTech
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    Oct 5, 2007
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    Loose pellets weigh 40 pounds per cubic foot.

    "Typical" bagged pellets weigh roughly 32 pounds per cubic foot.

    For a rough physical approximation, a ton of pellet will occupy a 4x4x3 space loose, or a 4x4x4 cube bagged.

    Joe
     
  6. DiggerJim

    DiggerJim
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    According to the Pellet Fuels Institute, PFI graded pellets must weigh a "minimum 40 pounds/cubic foot".

    Here's the link to the source: http://www.pelletheat.org/3/industry/index.html

    A cubic foot is an Imperial (non-metric) unit of defined volume (equivalent to a cube 1 foot - or .3048 meters - on a side) and does not change based on the container (or lack thereof).
     
  7. wi-dogfish

    wi-dogfish
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    Thanks guys,

    I am getting some bulk pellets and they do have a scale I can drive across to make sure I'm not overloaded.

    Take care
     
  8. BrownianHeatingTech

    BrownianHeatingTech
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    Bagged pellets take up more space, because there are air gaps between the multiple 40-pound or 15-kg bags (the two most common sizes).

    Joe
     
  9. DiggerJim

    DiggerJim
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    Guess I better call my pellet guy - I've got 3 pallets of pellets (Barefoot and Hamer) which are supposed to be 1 ton each and they do have 50 40-lb bags each but they're only 4 ft x 3.5 ft x 43 in. (a hair over 50 cu ft). They must have shorted the bags. Or maybe Stanley shorted my tape measure.

    Or maybe under the compressive force of a ton of weight, the bags squeeze into the air gaps and 20% of the space is not air after all. This pellet stuff is *so* confusing.
     
  10. BrownianHeatingTech

    BrownianHeatingTech
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    Guess you should. Probably also should check your pellets, as they may be over-dense. I've measured a lot of stacks of pellets, and they've never packed down to the same density as loose pellets - physics prevents it.

    The compressive force varies with the depth. The top bag is under none. Even the bottom bag is under only the weight of a few bags of pellets (whatever is vertically above it), not one ton of force.

    Joe
     
  11. DiggerJim

    DiggerJim
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    I guess my tape measure must be off then. Should teach me to trust my own eyes.

    Looks like Shortstuff in this thread (http://www.hearth.com/econtent/index.php/forums/viewthread/22987/) has the same problem measuring as his stacks also come out way small for 32lbs/cu ft bagged too. Seems more consistent with the advertised 40lbs/cu ft, but hey, YMMV as they say.
     
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