Beans - Chapter 19 | Official Grain Grading Guide

Determination of dockage


Dockage is assessed and recorded to the nearest 0.1%. Dockage is assessed only on unprocessed samples of beans.

Dockage is defined under the Canada Grain Act as “any material intermixed with a parcel of grain, other than kernels of grain of a standard of quality fixed by or under this Act for a grade of that grain, that must and can be separated from the parcel of grain before that grade can be assigned to the grain.” Dockage is removed by following the cleaning procedures described in this chapter.

The sample as it arrives is referred to as the uncleaned or dirty sample. Its weight is the gross weight of the sample. Dockage is assessed on the gross weight of the sample.

Dockage not reported


Dockage is not reported for samples grading.

  • Beans, Sample Canada (class) Account Fireburnt
  • Beans, Sample Salvage
  • Beans, Sample Condemned

Normal cleaning procedures


Wear gloves and a mask to handle any samples that you suspect may contain hazaradous substances.

Dockage is assessed only on unprocessed samples of beans. All foreign material in processed samples is assessed as grading factors.

  1. Using a Boerner-type divider, divide the uncleaned sample to obtain a representative portion.
    • Official samples shall be at least 1 kg.
    • Unofficial samples shall be at least 1 kg.
  2. Choose the appropriate hand sieve for the size of the bean.
    • No. 8 slotted
    • No. 9 slotted
    • No. 11 slotted
  3. Sieve the samples over the appropriate slotted sieve, using approximately 250 g at a time, to remove all readily removable material.
  4. Handpick the portion remaining on top of the slotted sieve to remove all coarse vegetable matter such as pods, stems, straw, thistle tops.
  5. Determine dockage. Use the list under Composition of dockage.


Do not remove mineral matter, ergot, sclerotinia, weed seeds or other grains.

Composition of dockage

Dockage includes

  • All material removed by sieving or handpicking or both, as defined in the previous section
  • Soft earth pellets, which are pellets that crumble under light pressure, including earth pellets, fertilizer pellets, or pellets of any non-toxic material of similar consistency
  • In unprocessed samples, mudballs handpicked from the cleaned sample

Commercially clean (CC)

Primary samples are considered commercially clean when they contain no dockage material.

Optional analysis

Where a shipper requests special cleaning of a carlot of grain at a terminal elevator, and the elevator manager agrees, dockage material will be analyzed for the presence of grain. The percentage and grade of any grain contained in the dockage will be reported.


  1. Analyze the official sample.
  2. Record the following on inspection records:
    • The percentage by gross weight to the nearest 0.1% and the grade of beans.
    • The percentage by gross weight to the nearest 0.1% and the grade of grain separable from dockage.
    • The percentage of dockage.

95.0% Beans No. 1 Can Cranberry

4.0% Domestic Mustard Seed, No. 1 Can Oriental

1.0% dockage