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For impermeable wrappers or containers, open the entire top or side
and place the package with the open portion on the side.
Step 6—Arranging and Operating Fans
Containerized Cargo
There must be two circulation fans in the container, both placed on
top of the stack. Place one fan at the doors (rear) and one fan in the
front. The rear fan is the gas introduction fan and should be pointed
into the container. The front fan is pointing in the opposite direction.
The electrical cords for the fans should be inserted through the
drainage holes located at the doors. The fumigator must obtain
approval from the owner of the container before removing the drains.
The drains may be removed by any practical means available. Re-seal
the holes using plumber’s putty or similar water-proof caulking
material to ensure minimal gas loss.
Turn on fans to make sure they work. Operate fans during gas
introduction and for 30 minutes after the gas is introduced. If after
taking gas concentration readings the fumigant is not evenly
distributed, run the fans until the gas is evenly distributed as
indicated by concentration readings (within 4 oz. of each other).
Operate fans when adding gas, but only long enough to get even gas
distribution.
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Preparing to Fumigate
2-8-8 Treatment Manual 10/2002-04
PPQ
FIGURE 2-8-1 Fan Placement
The refrigeration unit may be run throughout the entire fumigation to
enhance gas circulation and maintain pre-selected temperatures.
Step 7—Placing the Gas Introduction Lines
Containerized Cargo
Place the gas introduction line directly above the rear (door) fan.
Attach the line to the top of the fan to prevent movement of the hose.
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 the gas supply line. The sheet
will prevent any liquid MB from coming in contact with the cargo.
Step 8—Placing the Gas Sampling Tubes
Containerized Cargo
Place a minimum of three gas sampling lines in the container. Position
the gas sampling tubes in the following locations:
◆ Rear low - at the doors, 3 inches above the floor
◆ Middle center—center of the load, midway from bottom to top of
load
◆ Front high - at the extreme top of the load
Important
However, the ½ hour readings are at the minimum required concentration, or if
gas has been added twice to the reefer, turn the refrigeration unit off for the
remainder of the fumigation.
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Preparing to Fumigate
10/2002-04 Treatment Manual 2-8-9
PPQ
The gas introduction and sampling lines should be inserted through
the drainage holes located at the doors. The fumigator must obtain
approval from the owner of the container before removing the drains.
The drains may be removed by any practical means available. Re-seal
the holes using plumber’s putty or similar water-proof caulking
material to ensure minimal gas loss.
Use gas sampling tubes of sufficient length to extend from the sampling
position inside the container to at least 30 feet up-wind from the container.
Have all the gas sampling tubes meet in one area for ease and safety in
taking gas concentration readings. Do not splice gas sampling tubes.
Before starting the fumigation, test all gas sampling tubes for
tightness by connecting each gas sampling tube to the T/C unit and
placing a finger over the far end of the gas sampling tube. The ball in
the flow meter will fall to zero if the gas sampling tube connections are
tight. Replace any defective gas sampling tubes. Before starting the
fumigation, check for gas sampling tube blockage or pinching by
connecting each tube for a short time. If the tube is blocked, the flow
meter will drop sharply. Fix all gas sampling tubes securely in place in
the container and label each one at the end where the gas
concentration readings will be taken. By labeling each gas sampling
tube, you will be able to record concentration readings easily.
Step 9—Measuring the Temperatures
Determine the temperature to use in selecting the proper dosage rate:
◆ For fruits, pulpy vegetables, or logs use only the commodity
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