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03/2004-05 Treatment Manual 2-4-11
PPQ
indicated by concentration readings (within 4 oz. of each other).
Operate fans when adding gas, but only long enough to get even gas
distribution.
Containerized
Cargo
Use an appropriate number of fans which have the capacity to move
the equivalent cubic feet per minute of the total volume of the
enclosure. In addition, place one additional fan of at least 2,500 cfm at
the top of the load (near door) of each container facing the opposite
end of the container.
Place air introduction ducts, for aeration, into the far ends of each
container. Also, place exhaust ducts on the ground in front of the end
doors of the containers. Place the end of the ducts near the edge of the
tarpaulin so they can be pulled under the tarpaulin when aeration
begins.
Step 7—Placing the Gas Introduction Lines
Break Bulk
Cargo
Place the gas introduction line directly above the upper front fan.
Attach the line to the top of the fan to prevent movement of the hose.
An unsecured introduction line could tear the tarpaulin, move the
line, or direct it out of the airflow. The fan should be firmly attached to
the cargo or have a base that prevents it from toppling (not a pedestal
type). Place a piece of impermeable sheeting (example—plastic or
rubberized canvas) over the commodity below and to the front of each
gas supply line. The sheet will prevent any liquid MB from coming in
contact with the cargo.
Containerized
Cargo
The number and placement of gas introduction lines will depend upon
the number and arrangement of containers to be fumigated.
For single containers, place the introduction line directly above the fan
near the rear door of the container.
For multiple containers, place the introduction line near the door end
of the containers, but aimed across the open doors rather than directly
into one container.
If you are fumigating four or more containers under one tarpaulin,
then use two gas introduction lines.
Step 8—Placing the Gas Sampling Tubes
Break Bulk
Cargo
Place a minimum of three gas sampling tubes for fumigations up to
10,000 ft3. Position the gas sampling tubes in the following locations:
◆ Front low—front of the load, 3 inches above the floor
◆ Middle center—center of the load, midway from bottom to top of
load
◆ Rear high—rear of the load, at the extreme top of the load
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Preparing to Fumigate
2-4-12 Treatment Manual 03/2004-05
PPQ
See Figure 2-4-3
For fumigations from 10,001 to 25,000 ft3, use six gas sampling tubes.
Position the gas sampling tubes in the following locations:
◆ Front low—front of the load, 3 inches above the floor
◆ Upper front quarter section
◆ Middle center—center of the stack, midway from bottom to top
◆ Upper rear quarter section
◆ Lower rear quarter section
◆ Rear high—rear of the stack, at the extreme top
Contact the Center for Plant Health Science & Technology (CPHST) in
Raleigh, North Carolina, for approval of fumigations larger than
25,000 ft3, for instructions for number of gas sampling tubes, and for
other technical information.
Containerized
Cargo
For multiple containers (either 20 or 40 feet in length) under the same
tarpaulin, use at least three tubes per container. Also, for single
containers, use at least three tubes, and for khapra beetle
infestations, use two additional tubes. Position the gas sampling tubes
as follows:
◆ Front low—near the floor at the door end of the container
◆ Rear high—rear of the load at the high end opposite the fan
◆ Middle center—mid way from front to back, at mid depth
FIGURE 2-4-3: Gas Lead Position (Side View)
Important
For khapra beetle cargo containing baled, packaged, finely milled, or closely
packed commodities, place two additional gas sampling tubes in the center of
the bags, packages, or bales. Before placing gas sampling tubes in
commodities, place burlap over the end of the tube and secure the burlap to
the tube with tape.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Preparing to Fumigate
03/2004-05 Treatment Manual 2-4-13
PPQ
If treating commodities for khapra beetle, you will need the following
additional gas sampling tubes:
◆ High (in the commodity)
◆ Low (in the commodity)
Cover the end of the gas sampling tube with burlap taped to the tube
before insertion into the commodity.
Break Bulk and
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