BS 3986-2:1998

Committees responsible
Foreword
Method
1 Scope
2 References
3 Definitions
4 Symbols and units
5 Test procedure
6 Grain quality
7 Methods of correction of test results
8 Test report
Annexes
A (informative) Grain moisture content and sampling
B (informative) Moisture removals in specific crops
C (normative) Testing reduction in grain germination
D (normative) Tables for correction of dryer performance
E (informative) Airflow calculations
Tables
1 Guide to dryer residence times
2 Minimum moisture removals
3 Reference air ambient conditions for specifying
      drying performance
4 Example of observed and required specified reference
      conditions
5 Example interpolation of four parameters
C.1 Tolerances for testing a difference between two
      percentage germinations
D.1 Wheat: effect of ambient air temperature and relative
      humidity at constant initial moisture content
      of grain
D.2 Wheat: effect of grain initial and final moisture
      content, drying air temperature and volumetric airflow
D.3 Oilseed rape (canola): effect of grain initial and
      final moisture content, drying air temperature and
      volumetric airflow
D.4 Maize: effect of grain initial and final moisture
      content, drying air temperature and volumetric airflow
D.5 Rice: effect of grain moisture content range, drying
      air temperature and volumetric airflow in
      multi-pass drying
D.6 Sorghum: effect of grain initial and final moisture
      content, drying air temperature and volumetric airflow
E.1 Values of coefficients, i and n, in the power law
      equations describing the dependence of crop pressure
      resistance on air velocity
Figures
A.1 The effect of range of variation in grain moisture
      content on the standard error of the means of 15
      samples
A.2 Effect of number of samples on the standard error of
      the mean grain moisture content for different ranges
      in variation
A.3 Relationship between moisture removed and range in
      variation in grain moisture content for a confidence
      level on evaporation rate of plus/minus 5% or better
      at the 95% level of probability
List of references

Gives additional procedures and requirements for commercial crops in addition to wheat over a wider range of conditions than that given in BS 3986:1991 now amended to become Part 1.

This Part of BS 3986 specifies additional procedures and gives guidance for testing and evaluating the drying performance of continuous-flow and batch grain dryers for specific grain crops including wheat, barley, oats, maize, rice, sorghum and rape. It supplements the general procedures given in BS 3986 : Part 1 that are based on drying only wheat over a limited range of moisture content of 20 % to 15 % wet basis.

Methods and data are given for:

1. determining the evaporation rate of dryers when drying grain crops under steady state conditions; and
2. correcting the main dryer performance characteristics, including evaporation rate, grain flow rate, drying time and specific energy and fuel consumption, to reference and other ambient conditions.

Procedures are given for sampling input and output grain to assess changes in grain quality.