Common menu bar links

Domestic mustard seed – Chapter 12
Official Grain Grading Guide

Determination of dockage

Definitions

Dockage is assessed and recorded to the nearest 0.1%.

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 is assessed in two stages.

Follow Normal cleaning procedures, using the Carter dockage tester.
Follow procedures for Cleaning for grade improvement. This cleaning can be done at any time after the cleaning assessment has been completed.

Dockage not reported

▲ Important: Dockage is not reported for samples grading

Domestic Mustard Seed, Sample Canada class) Account Fireburnt
Domestic Mustard Seed, Sample Salvage
Domestic Mustard Seed, Sample Condemned

Normal cleaning procedures

▲ Important: Wear gloves and a mask to handle any samples that you suspect may contain hazardous substances.

1. Set up the Carter dockage tester as follows:

Feed control	#3
Air control	#7
Riddle	No. 000
Top sieve	Blank tray
Centre sieve	none
Bottom sieve	none
Sieve cleaner control	off

2. You also need the following hand sieves:

Round-hole hand sieves	Slotted hand sieves
No. 5.5	No. .028
No. 6	No. .032
No. 6.5	No. .035
No. 7	No. .038
No. 7.5	No. .040

3. Using a Boerner-type divider, divide the uncleaned sample to obtain a representative portion.

Official samples should be at least 900 g.
Unofficial samples should be at least 750 g.

4. For hand sieving use approximately 250 g.

▲ Important:

Ensure you start with the right sized sieves.
When you use a hand sieve, move the sieve from left to right 30 times, using a sifting motion. One time is one complete motion from the centre to one side, to the other side, to the other side, and back to the centre. The total distance from left to right is 20 cm, or about eight inches.

Use whichever round-hole sieve will achieve maximum removal of large material with minimum loss of domestic mustard seed.
Use whichever slotted sieve will achieve maximum removal of weed seeds with minimum loss of domestic mustard seed.

5. Combine the separated, cleaned 250-g portions.

6. Turn on the Carter dockage tester.

7. Pour the sample into the hopper.

8. After the sample has passed through the machine, turn off the machine.

Reduce the air setting to #5 if there is a large loss of whole, reasonably sound seed.
If the sample after normal cleaning with air control at #7 qualifies only for Sample grade, you must start all over again. Recombine the sample and whatever material has been removed, and re-assess dockage with the air control at #5.

9. Determine dockage, using the list under Composition of dockage.

Composition of dockage

Dockage includes

Material remaining on top of the round-hole hand sieve
Material passing through the slotted hand sieve
Material passing over the No. 000 riddle
Material removed by aspiration
Material removed by Cleaning for grade improvement

Primary samples, commercially clean

Commercially clean primary samples can have up to 0.5% for broken and reasonably sound mustard seed deducted from the gross weight of the dockage. Primary samples are considered commercially clean when the net dockage does not exceed 2.5% of the sample weight.

Primary samples, not commercially clean

In not commercially clean primary samples, there is no allowance for broken and reasonably sound mustard seed. All the material removed by the slotted sieve is assessed as dockage.

Cleaning for grade improvement

If the grade of a delivery can be improved by additional cleaning, perform the cleaning and add the additional material to dockage. Cleaning for grade improvement can be done at any time after the cleaning assessment has been completed.

Carter dockage tester

After the cleaning assessment has been completed, examine the material to be removed and select your equipment according to the material you want to remove. See the table Cleaning for grade improvement — domestic mustard seed.
Pass the sample through the Carter dockage tester.
Weigh the additional dockage and add it to the original dockage.

Spiral cleaner — for yellow mustard seed and only upon request

Operating procedures

The sample to be cleaned by the spiral is the net sample remaining after normal cleaning procedures.
Pour the sample into the feed hopper at the top of the spiral. Once the sample has passed through the spiral, lightly tap it to remove any lodged seeds remaining on the flights.
Collect the seeds that have discharged from the bottom spout (spout closest to the core of the cleaner)
Determine the percentage by weight of the seeds that have discharged and determine if more than 5.0% of yellow mustard has been removed per grade improvement.

Reporting procedures

Where the grade is not improved or more than 5.0% of domestic mustard is removed for each grade improvement, the grade and dockage will not be revised.
Where the grade can be improved while removing 5.0% or less of domestic mustard for each grade improvement, the certificate will state only the grade and dockage achieved through use of the spiral cleaner or Carter dockage tester.

Cleaning for grade improvement — domestic mustard seed
Material to be removed	Equipment		Effect on composition of dockage
Excessive inseparable weed seeds or damaged mustard seeds for yellow mustard seed. Note: The material originally removed by aspiration is to be reconstituted back into the sample prior to cleaning for improvement.	Spiral cleaner—on request, for yellow mustard seed only		Not more than 5.0% of domestic mustard seed may be removed for each grade improvement achieved.
	Carter dockage tester set as follows:
	Feed control	#3
	Air control	#7
	Riddle	No. 000
	Top sieve	No. 4.5 or No. 5 round-hole
	Centre sieve	blank tray
	Bottom sieve	none
	Sieve cleaner control	off
Excessive inseparable weed seeds or damaged mustard seeds for brown or oriental mustard seed. Note: The material originally removed by aspiration is to be reconstituted back into the sample prior to cleaning for improvement.	Spiral cleaner—on request, for yellow mustard seed only		Not more than 5.0% of domestic mustard seed may be removed for each grade improvement achieved.
	Carter dockage tester set as follows:
	Feed control	#3
	Air control	#7
	Riddle	No. 000
	Top sieve	No. 4.5 or No. 5 round-hole
	Centre sieve	blank tray
	Bottom sieve	none
	Sieve cleaner control	off
Canola or wild mustard in yellow mustard seed	Carter dockage tester set as follows:		The material passing through the sieve is included in the dockage. Not more than 5.0% of domestic mustard seed may be removed for each grade improvement achieved.
	Feed control	#3
	Air control	off
	Riddle	No. 000
	Top sieve	none
	Centre sieve	No. 4.5 or No. 5 round-hole
	Bottom sieve	blank tray
	Sieve cleaner control	off

Optional analysis

Where a shipper requests special cleaning of a carlot of grain at a terminal or transfer 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 and elevator stocks will be adjusted on the basis of the analysis. Agreement of the shipper and unload elevator must be conveyed to the CGC in writing prior to the analysis being performed.

Procedures

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

Example
95.0% Domestic Mustard Seed, No. 1 CAN Yellow
4.0% Rye, No. 2 CW
1.0% dockage