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Step 7—Placing the Gas Introduction Lines page-2-8-8
Step 8—Placing the Gas Sampling Tubes page-2-8-8
Step 9—Measuring the Temperatures page-2-8-9
Step 10—Measuring the Volume page-2-8-10
Step 11—Calculating the Dosage page-2-8-11
Step 12—Making a Final Check page-2-8-11
Conducting the Fumigation page-2-8-12
Step 1—Introducing the Gas page-2-8-12
Step 2—Testing for Leaks page-2-8-13
Step 3—Taking Concentration Readings page-2-8-14
Step 4—Determining the Need to Add Gas and Adjust Exposure page-2-8-16
Special Procedures for Adding Gas and Extending Exposure Period page-2-8-17
Special Procedures for Fruits, Vegetables, or Perishable Commodities Using Schedule
T101-a-1 or Equivalent page-2-8-18
Special Procedures for Adding Gas to Oak Logs and Lumber Using T312 or
Equivalent page-2-8-23
Exhausting the Gas page-2-8-23
Aerating the Enclosure page-2-8-23
Responsibility for Aerating the Commodity page-2-8-24
Materials Needed page-2-8-24
Securing the Area page-2-8-24
Wearing Respiratory Protection page-2-8-25
Aerating Nonsorptive, Containerized Cargo page-2-8-25
Step 1—Installing Exhaust System page-2-8-25
Step 2—Aerating the Commodity page-2-8-26
Aerating Sorptive Commodities in Containers page-2-8-27
Step 1—Installing the Exhaust System page-2-8-27
Step 2—Aerating the Commodity page-2-8-27
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Methods and Procedures
2-8-2 Treatment Manual 10/2002-04
PPQ
Methods and Procedures
The procedures covered in this section provide PPQ Officers and
commercial fumigators with the methods, responsibilities, and
precautions for container fumigation without a tarpaulin.
A refrigerated container may be used for fumigations without a
tarpaulin provided the following requirements are met:
◆ The container must be a refrigerated (reefer) container
◆ The container must have the two drainage holes removed at the
doors. If damage will occur to the container by removal of these
drains, the fumigator should obtain permission from the
container manufacturer
◆ before proceeding.
◆ The container must have three gas monitoring leads to be located
in the front-high, middle-middle and rear-low of the container.
(The "rear" is considered to be at the doors.)
◆ The container must be packed (in some cases re-packed) so that
one circulation fan can be placed in the front and one in the
back. This will ensure at least 2’ of air space above the
commodity. Use fans which have the capacity to move a volume
of air in cubic feet per minute equivalent to the total volume of
the container. The rear fan (at the doors) has the gas
introduction hose attached to it and is referred to as the gas
introduction fan.
◆ The PPQ officer must visually inspect the container prior to
fumigation to identify any possible areas of leakage for the
fumigator to repair.
◆ Air exchange vents must be closed and taped if any openings are
visible.
Materials Needed
PPQ Officer Provides
◆ Calculator (optional)
◆ Colorimetric tubes (Draeger/Kitagawa)
◆ Desiccant (Drierite®)
◆ Forms (PPQ Form 429 and APHIS Form 2061 if necessary)
◆ Halide leak detector
◆ Self-contained breathing apparatus (SCBA) or supplied air
respirator to be used by PPQ officer
Chemical Treatments Fumigants • Methyl Bromide • Special Procedures for Container Fumigations Without a Tarpaulin
Preparing to Fumigate
10/2002-04 Treatment Manual 2-8-3
PPQ
◆ Tape measure
◆ Thermal conductivity unit1, 2
◆ Thermometer
Fumigator Provides
◆ Auxiliary pump for purging long gas sample tubes
◆ Carbon dioxide filter (Ascarite®)
◆ Colorimetric tubes (Draeger/Kitagawa)
◆ Desiccant (Drierite®, anhydrous calcium sulfate)
◆ Electrical wiring (grounded, permanent type), three prong
extension cords
◆ Fans (circulation, exhaust, and introduction)
◆ Gas introduction line
◆ Gas sampling tubes (leads)
◆ Methyl bromide
◆ Scales or dispensers
◆ Self-contained breathing apparatus (SCBA) or supplied air
respirator
◆ Tape
◆ Thermal conductivity unit3, 4
◆ Volatilizer
◆ Warning signs
Preparing to Fumigate
Step 1—Selecting a Treatment Schedule
Select a treatment schedule to effectively eliminate the plant pest
without damaging the commodity being fumigated.
Turn to the Treatment Schedule Index and look up the available
　
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