Horizontal pressures in cylindrical metal silos and comparison with different international standards

José W.B. Do Nascimento, José P.Lopes Neto, Michael D. Montross

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The focus of this research was to evaluate the horizontal pressures ona cylindrical metal silo of corrugated walls and flat bottom with 1.82m diameter and 5.4m high, and to compare the values with those obtained theoretically by the ISO 11697, EP 433 and AS 3774 standards. The silo was symmetrically filled and constant speed with wheat cv. soft red for two different height/diameter ratios (H/D) and was unloaded through three orifices with a diameter of 71.6mm, one concentric and two eccentrics. Horizontal pressureswere measured on the walls of the silo at three positions using hydraulic type pressure cells. The results showed that shortly after the start of the unloading, there was a mass flow above the quota of H/D = 1.2, whereas below this quota funnel flow occurred. It can be said that the EP 433 standard was more appropriate to predict horizontal pressures in silos in H/D ratio = 1.0, with eccentric unloading. For the H/D ratio = 1.5, AS 3774 standard was the one that produced values closer to the experimental.

Original languageEnglish
Pages (from-to)601-611
Number of pages11
JournalEngenharia Agricola
Issue number4
StatePublished - 2013


  • Eccentric unloading
  • Horizontal pressures in silos
  • Mixed flow

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)


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