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perishables)
TABLE 2-4-3: Determine the Need to Add Gas and Adjust Exposure
If the average T/C unit
readings are:
And the
schedule is: Then:
Below the required
minimum concentration
T101-a-1* or
equivalent
ADD gas and extend fumigation. SEE
“Special Procedures for Fruits,
Vegetables, or Perishable Commodities
Using Schedule T101-a-1 or Equivalent”
on page-2-4-25
Other than T101-a-1
or equivalent
ADD gas using ““Special Procedures for
Adding Gas to Oak Logs and Lumber
Using T312 or Equivalent” on
page-2-4-28
At or above required
minimum concentration
T101-a-1* or
equivalent
SEE pages page-2-4-21 for corrections
at 0.5 hour and 2 hour readings
Other than T101-a-1 No action necessary
Important
* T101-a-1 or equivalent treatment schedules are those schedules that are
not greater than 2 hours long (exposure time), and the dosage rate is not
greater than 4lbs per 1000ft3, anywhere on the schedule.
Important
T101-a-1 or equivalent treatment schedules are those schedules that are not
greater than 2 hours long (exposure time), and the dosage rate is not greater
than 4lbs per 1000ft3.
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Conducting the Fumigation
2-4-24 Treatment Manual 03/2004-05
PPQ
When adding gas, these procedures must be followed:
1. Heat water in volatilizer.
2. Turn on fans.
3. Take weight of the cylinder.
4. With SCBA on, open valve on cylinder and introduce the gas.
5. Close valve when the weight of the cylinder indicates that the
needed amount of gas has been added.
6. Record quantity of fumigant added in Block 34 and the
additional fan time in Block 30 of the PPQ Form 429.
Note the time the fumigator started introducing additional gas and the
time the fumigator finished introducing gas and record in Block 40
(Remarks) of the PPQ Form 429. Run the fans until there is even gas
distribution throughout the stack. Turn off fans, then take a
concentration reading 30 minutes after the gas has been introduced. If
all readings are above minimum concentration levels, then proceed as
usual with the remaining scheduled concentration readings.
Excessive leakage in any one tarpaulin enclosure, which cannot be
eliminated in a practical way, must not be corrected by the addition of
MB. (Excessive leakage has occured when concentration readings are
less than or equal to 50 percent of minimum concentration reading).
Quickly evacuate remaining gas from such an enclosure, eliminate the
problem, and construct a new enclosure. Start a new treatment in the
new enclosure.
To avoid injuring the commodity, add fumigant using the following formula:
1.6 × number of oz. below minimum × volume in ft.3/1,000 ft.3 = oz. of gas
to add or oz. of gas to add/16 oz/lbs. = pounds (lbs.) of gas to add.
Commodities used for food or feed may not be re-treated. If commodities fall
into this category, the only options are the following:
◆ Re-export to another country if they will accept the shipment
◆ Destroy by incineration
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Conducting the Fumigation
03/2004-05 Treatment Manual 2-4-25
PPQ
Extending the Exposure Period for Food, Nonfood, Feed, or
Nonfeed Commodities
Use the following table to determine how long to extend the exposure
period.
Special Procedures for Fruits, Vegetables, or Perishable
Commodities Using Schedule T101-a-1 or Equivalent
Use these instructions only for fruits and vegetables being fumigated
under treatment schedule T101-a-1 or equivalent.
Use Table 2-4-5 and Table 2-4-3 on the following pages for fresh
fruits and vegetables to determine if you need to add gas or extend or
decrease the exposure time. Average your concentration readings
before using the tables. Select the proper table based on the time of
the T/C unit concentration reading (30 minutes or 2 hours).
TABLE 2-4-4: Determine the Extended Exposure Period
If the exposure time is:
And the reading is
below minimum by:1
1 If a reading is 50 percent or more below the minimum concentration reading, then abort the
treatment. For example, if the minimum reading is 38 ounces then the reading 50 percent below
the minimum is 19 ounces [38 ounces − (38 ounces × .50) = 19 ounces]. (See the following
special procedures for fruits and vegetables using T101 or equivalent.) For oak logs and oak
lumber (T312-a and T312-b), the rule for adding exposure time does not apply. Refer to the
　
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