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Vacuum Fumigation Chambers—Aerating Containerized and Noncontainerized Cargo
10/2002-04 Treatment Manual 2-5-7
PPQ
Step 2—Aerating the Chamber
Adjust any vacuum remaining at the end of the fumigation to zero by
temporarily opening the air intake valve, then closing it. Draw a 15
inch vacuum and adjust it to zero. Repeat this process of drawing a 15
inch vacuum and releasing it four times or as many times as
experience indicates is necessary.
Step 3—Taking Concentration Readings
Draw an air sample from the chamber through the gas sampling tube
into a colorimetric tube. Use Table 2-5-6 to determine when to release
the commodity.
WARNING
Do not allow motorized vehicles to operate within the secure area.
TABLE 2-5-6: Determine When to Release the Commodity
If the gas concentration is: Then:
5 ppm or less RELEASE commodity
6 ppm or above 1. Do two more vacuum washes
2. TAKE concentration readings, and
3. RELEASE commodity when the concentration level is 5
ppm or less
Important
Some vacuum chambers do not have sampling tubes. After four air washes,
while wearing the SCBA, open chamber door and take colorimetric reading.
Chemical Treatments Fumigants • Methyl Bromide • Chamber Fumigation
Vacuum Fumigation Chambers—Aerating Containerized and Noncontainerized Cargo
2-5-8 Treatment Manual 10/2002-04
PPQ
10/2002-04 Treatment Manual 2-6-1
PPQ
Treatment Manual
2 Chemical Treatments 6
Fumigants • Methyl Bromide • Ship
Fumigation
Contents
Methods and Procedures page-2-6-1
Materials Needed page-2-6-2
PPQ Officer Provides page-2-6-2
Fumigator Provides page-2-6-2
Taking Safety Measures When Fumigating Ships page-2-6-3
Preparing to Fumigate page-2-6-4
Step 1—Meeting With Ship’s Captain and Agent page-2-6-4
Step 2—Selecting a Treatment Schedule page-2-6-4
Step 3—Determining Section 18 Exemptions and Sampling Requirements
page-2-6-5
Step 4—Preparing Areas to Be Fumigated page-2-6-5
Step 5—Arranging and Operating Fans page-2-6-5
Step 6—Placing Gas Sampling Tubes page-2-6-6
Step 7—Placing the Gas Introduction Lines page-2-6-6
Step 8—Measuring the Temperature page-2-6-7
Step 9—Heating the Cargo Hold page-2-6-7
Step 10—Sealing Stores page-2-6-7
Step 11—Measuring Volume page-2-6-9
Step 12—Calculating Dosage page-2-6-9
Step 13—Making a Final Check page-2-6-9
Conducting the Fumigation page-2-6-10
Step 1—Introducing the Gas page-2-6-10
Step 2—Taking Concentration Readings page-2-6-11
Step 3—Testing for Leaks page-2-6-11
Step 4—Adding Gas and Extending Exposure page-2-6-11
Step 5—Exhausting the Gas page-2-6-12
Aerating the Hold or Storeroom page-2-6-13
Step 1—Securing the Area page-2-6-13
Step 2—Aerating the Area page-2-6-13
Step 3—Taking Concentration Readings to Determine When to Release the Ship
page-2-6-13
Methods and Procedures
The procedures covered in this section provide commercial fumigators
with the methods, responsibilities, and precautions for ship
fumigation.
Chemical Treatments Fumigants • Methyl Bromide • Ship Fumigation
Materials Needed
2-6-2 Treatment Manual 10/2002-04
PPQ
In general, ship fumigations present problems not encountered in
other types of fumigations. The large amount of gas required and the
varying space configurations from ship to ship make it essential that
experienced pest control operators and PPQ officers with extensive
fumigation experience perform ship fumigations.
Materials Needed
PPQ Officer Provides
◆ PPQ Form 429
◆ Calculator (optional)
◆ Colorimetric tubes (Draeger/Kitagawa)
◆ Desiccant (Drierite®)
◆ Halide leak detector
◆ SCBA or supplied air respirator
◆ Tape measure
◆ Thermal conductivity unit1
◆ Thermometer
Fumigator Provides
◆ Adhesive sealer, tape, and putty or other pliable material for
sealing off holes around pipes
◆ Auxiliary pump for purging long gas sample tubes
◆ Carbon dioxide filter (Ascarite®)
◆ Colorimetric tubes (Draeger/Kitagawa)
◆ Electrical wiring (ground, permanent type), three prong
extension cords
◆ Exhaust blower and ducts
These procedures are used primarily for fumigation of ships that are infested
with khapra beetle.
Generally, fumigation of commodities within the structure of a ship, such as
cargo holds, cannot meet APHIS standards for fumigation, and these
fumigations are not recommended by APHIS. However, on a case by case
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