Stored Grain Pack Factors for Wheat: Comparison of Three Methods to Field Measurements

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dc.contributor.author Boac, Josephine M.
dc.contributor.author Bhadra, Rumela
dc.contributor.author Casada Mark E.
dc.contributor.author Thompson Sidney A.
dc.contributor.author Turner Aaron P.
dc.contributor.author Montross Michael D.
dc.contributor.author McNeill Samuel G.
dc.contributor.author Maghirang Ronaldo G.
dc.date.accessioned 2015-09-21T18:40:36Z
dc.date.available 2015-09-21T18:40:36Z
dc.identifier.uri http://hdl.handle.net/2097/20440
dc.description.abstract Storing grain in bulk storage units results in grain packing from overbearing pressure, which increases grain bulk density and storage unit capacity. This study compared pack factors of hard red winter (HRW) wheat in vertical storage bins using different methods: the existing packing model (WPACKING), the USDA Risk Management Agency (RMA) method, and the USDA Farm Service Agency Warehouse Licensing and Examination Division (FSA-W) method. Grain bins containing HRW wheat were measured in Kansas, Oklahoma, and Texas. Packing was measured in corrugated steel bins and reinforced concrete bins with diameters ranging from 4.6 to 31.9 m (15.0 to 104.6 ft) and equivalent level grain heights ranging from 4.1 to 41.6 m (13.4 to 136.6 ft). The predicted masses of compacted stored wheat based on WPACKING, RMA, and FSA-W were compared to the reported mass from scale tickets. Pack factors predicted by WPACKING ranged from 0.929 to 1.073 for steel bins and from 0.986 to 1.077 for concrete bins. Pack factors predicted by the RMA method ranged from 0.991 to 1.157 for steel bins and from 0.993 to 1.099 for concrete bins. Pack factors predicted by the FSA-W method ranged from 0.985 to 1.126 for steel bins and from 1.012 to 1.101 for concrete bins. The average absolute and median differences between the WPACKING-predicted mass and reported mass were 1.64% and -1.26%, respectively, for corrugated steel bins and 3.75% and 2.16%, respectively, for concrete bins. In most cases, WPACKING underpredicted the mass in corrugated steel bins and overpredicted the mass in concrete bins. Comparison of the RMA-predicted mass and reported mass showed an average absolute difference of 4.41% with a median difference of 1.91% for HRW wheat in steel bins and an average absolute difference of 3.25% with a median difference of 1.03% for concrete bins. For the FSA-W-predicted mass versus reported mass, the average absolute and median differences were 3.40% and 3.86%, respectively, for steel bins and 4.34% and 3.50%, respectively, for concrete bins. Most of the mass values were overpredicted by both the RMA and FSA-W methods. Some of the large differences observed for concrete bins can be attributed to the unique geometry of these bins and the difficulty in describing these bin shapes mathematically. Overall, compared to the reported mass, WPACKING predicted the mass of grain in the bins with less error than the current RMA and FSA-W methods. Some of the differences may be because the RMA and FSA-W methods do not include the effects of grain moisture content, bin wall type, and grain height on pack factors. en_US
dc.language.iso en_US en_US
dc.publisher Transactions of the ASABE en_US
dc.relation.uri https://doi.org/10.13031/trans.58.10898 en_US
dc.rights This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). en_US
dc.rights.uri http://rightsstatements.org/vocab/InC/1.0/
dc.subject Commercial bin measurement en_US
dc.subject Steel and concrete bins en_US
dc.subject Stored grain pack factor en_US
dc.subject Wheat en_US
dc.subject WPACKING en_US
dc.title Stored Grain Pack Factors for Wheat: Comparison of Three Methods to Field Measurements en_US
dc.type Article (publisher version) en_US
dc.date.published 2015 en_US
dc.citation.doi 10.13031/trans.58.10898 en_US
dc.citation.epage 1101 en_US
dc.citation.issn 0001-2351 en_US
dc.citation.issue 4 en_US
dc.citation.jtitle Transactions of the ASABE en_US
dc.citation.spage 1089 en_US
dc.citation.volume 58 en_US
dc.contributor.authoreid rbhadra en_US


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This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). Except where otherwise noted, the use of this item is bound by the following: This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

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