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Using a halide detector, check all connections on the gas introduction
line for leaks. If leaks are found, have the fumigator tighten the
connections and repeat the test. If no leaks are found, have the
fumigator open the valve to the point where 3 to 4 pounds of MB are
being introduced per minute. The gas introduction line should always
feel hot and the volatilizer must read at least 150 °F.
The fumigation time begins when all the gas has been introduced.
Record the time gas introduction was started and completed in Block
32 on the PPQ Form 429. Run the fans for 30 minutes after all the gas
has been introduced. You will take the initial concentration reading 30
minutes after all the gas has been introduced.
PPQ Officers must wear the SCBA anytime they are within 30 feet of area
being fumigated. You and the fumigator both must use SCBA while introducing
the gas, checking for leaks, and when taking aeration readings.
Do not touch the introduction line with your bare hands—you may get burned!
Have the fumigator close the cylinder valve once the proper dosage has been
introduced.
Chemical Treatments Fumigants • Methyl Bromide • Ship Fumigation
Conducting the Fumigation
10/2002-04 Treatment Manual 2-6-11
PPQ
When using cylinders, getting the final amounts of gas out of the
cylinder may take a long time. Consider taking T/C unit readings 30
minutes after the gas is first introduced. If the gas distribution is even
(all readings within 4 ounces of each other) and at an adequately high
concentration, then you can turn off the fans. Running the fans longer
may contribute to gas leakage. Allow the remainder of the gas to
discharge at its slow rate with intermittent running of the fans for
dispersal.
Step 2—Taking Concentration Readings
Take concentration readings with a T/C unit to determine the gas
concentration and distribution within the area being fumigated (galley,
storeroom, or cargo holds). Check Drierite® tubes before each reading
and change Drierite® if its color is pink. Depending upon the length of
exposure period, take concentration readings at the following times
after the introduction of the fumigant:
◆ 30 minutes
◆ 2 hours
◆ 4 hours
◆ 6 hours
◆ 12 hours
◆ 24 hours
◆ 48 hours
◆ 72 hours (for Cochlicella, Helicella, and Monacha spp.)
Consult the treatment schedule being used for the actual
concentration readings. You may start the final concentration reading
30 minutes prior to the end of the exposure period.
Take additional readings when there is indication that the gas is not
properly distributed or the minimum gas concentration is not being
maintained. Record readings on PPQ Form 429.
Step 3—Testing for Leaks
Wearing the SCBA, use a halide detector to test for leaks after all the
gas has been introduced. Test around the perimeter of the area being
fumigated, especially where doors, windows, pipes, electric cords, gas
sampling tubes, and gas introduction lines are present. If you detect
leaks, be sure they are sealed with additional tape, adhesive, or by
placing more polyethylene and adhesive over the leaking areas.
Step 4—Adding Gas and Extending Exposure
You may add gas at the following rate when concentration readings fall
below the minimum:
Chemical Treatments Fumigants • Methyl Bromide • Ship Fumigation
Conducting the Fumigation
2-6-12 Treatment Manual 10/2002-04
PPQ
1.6 × number of oz. below minimum × volume/1,000 = oz. of gas to
add
EXAMPLE: You are fumigating a ship’s storeroom for khapra beetle
and the minimum concentration for the 2 hour reading is listed at 50
oz. but your readings average 45 oz. The volume of the storeroom is
1,500 ft3. Using the above formula, you would figure the following:
1.6 × 5 (oz. below min.) × 1,500/1,000
8 × 1.50 = 12 oz. gas to be added
Extending
Exposure Period
Use Table 2-6-2 to determine how long to extend the exposure period:
Step 5—Exhausting the Gas
Exhaust the gas at the completion of the exposure period. If the
treatment schedule is a FIFRA Section 18 Exemption, then you must
monitor the aeration of the fumigated area. Use Table 2-6-3 to
determine if you need to monitor the aeration of the fumigated area:
Removal of the fumigant from cargo holds is facilitated by using an
outside blower to force fresh air through portable canvas, plastic, or
similar ducts. Another method is to use compressed air hoses to force
fresh air into the bottom of the hold. Use fans or blowers within the
fumigated space to help aerate the hold. Use suction type fans with
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