AMETEK Brookfield Page 48
Manual No. M09-1200-F1016
Friction Angle curve is used for comparisons. This reports the Internal Angles at the
Time critical stresses based on this curve. If you want to compare the instantaneous
and time critical stresses within a single Time Test data set, you can do so in the
Analysis section.
• For Wall Friction Test data, the Wall Friction Angle curve from the Maximum Wall
Locus is used for comparisons. If you want to compare Wall Friction Angle curves
at different displacements within the same data set, you can do so in the Analysis
section. If a Wall Test data set is part of the Comparison, no angles are reported for
critical stresses, because the critical stresses for the Wall file are unknown.
• Density Test data: Not applicable.
c) Bulk Density Curves:
• For Flow Function Test data, the densities measured at the steady state of each locus
line is used for comparisons. This reports densities at critical stresses for arching and
rat-holing.
• For Time Consolidated Flow Function Test data, the instantaneous density curve is
used for comparisons. This reports densities at critical stresses for arching and rat-
holing.
• For Wall Friction Test data, the density data from the different consolidation
stresses during the test are used for comparisons. If a Wall Test data set is part of
the Comparison, no densities are reported for critical stresses, because the critical
stresses for the Wall file are unknown.
• For Bulk Density Test data, the density data from the compactions are used for
comparisons. If a Density Test data set is part of the Comparison, no densities are
reported for critical stresses, because the critical stresses for the Density file are
unknown.
d) Hopper Design:
• For Flow Function Test data, the critical values from the regular flow function,
friction angle, and bulk density curves are used for comparisons. There is no external
Density file option values are taken from within the Flow Function Test data file.
• For Time Consolidated Flow Function Test data, the critical values from the time
consolidated flow curve are used for comparisons. Use the instantaneous friction
angle along with the density curves. There is no external Density file option. If you
want to compare instantaneous and time consolidated outlet sizes within one Time
Test data set, you can do so in the Analysis section.
• Hopper Half Angle is not included in the Comparison section, because each
calculation requires specifying two data sets, a Flow Function (or Time Consolidated
Flow Function) Test and a Wall Friction Test data set.
• Rat-Hole Diameter and Arching Dimension values are displayed for each data set.
To get a true Rat-Hole, the Bin Diameter and Height (Powder Height) value must be
input. For Arching Dimension, choose either Conical or Plane for the proper hopper
outlet.
