Brookfield PFT Powder Flow Tester Operating Instructions Manual page 44

e) Density Curve:
• Flow Function Test data shows one curve based on the initial fill density and the
densities measured at the Steady State stress values. The Density for the critical
Arching stress and critical Rat-hole stress are also reported.
• Time Consolidated Flow Function Test data reports instantaneous results along
with the Density for the Time critical Arching stress and Time critical Rat-hole
stress.
• Wall Friction Test data shows one curve based on the initial fill density and the
different consolidation stresses during the test.
• Bulk Density Curve Test data shows one density curve including initial fill density.
f) Hopper Design:
• Single values for Arching Dimension and Rat-hole Diameter are calculated
automatically using the "Critical Consolidation Stress".
• In Mass Flow, Arching Dimension and Hopper Half Angle are calculated. A graph of
hopper half angle vs. hopper outlet dimension is given. The hopper outlet dimension
is equivalent to the arching dimension.
AMETEK Brookfield
Figure IV-22: Density Curve Graph
Page 44 Manual No. M09-1200-F1016