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the top and bottom and average the two to determine the dimension.
Enclosure height should always be uniform and not require
adjustment.
Formula for determining volume:
Length × width × height = volume in cubic feet
EXAMPLE: A stack with measurements H=10′6″, L=42′3″, and
W=10′9″ 10.50 × 42.25 × 10.75 = 4,768.9 ft3 round to 4,769 ft3
Record volume in Block 26 of the PPQ Form 429.
Step 14—Calculating the Dosage
Calculate dosage by doing the following:
1. Refer to the treatment schedule for the correct dosage rate (lbs./
1,000 ft3) based on temperature ( °F) (Step 10).
2. Multiply by the dosage (lbs./1,000 ft3) rate by the volume (ft3) to
get the dosage in pounds.
3. Rules for rounding. Round to nearest 1/4 pound.
Formula for calculating dosage:
dosage (lbs.) = volume(ft3) × dosage rate (lbs./1,000 ft3)
volume(ft3) × dosage rate (lbs.)
1,000 ft3
= -----------------------------------------------------------------------------
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Preparing to Fumigate
2-4-18 Treatment Manual 03/2004-05
PPQ
EXAMPLE: You need to determine the dosage for a stack with a
volume of 3,000 ft3. For 72 °F (air and commodity temperatures), the
treatment schedule lists the dosage rate at 2 pounds MB/1,000 ft3.
Determine dosage by doing the following:
Step 15—Making a Final Check
Just prior to introducing the gas, do the following:
◆ Turn on all fans and T/C unit to make sure they work.
◆ Warm up T/C unit at least 30 minutes before zeroing in.
◆ If contaminant, CO2, is detected, test again with Ascarite®. If you
get a zero reading, proceed. If you don’t get a zero reading,
suspect a leak.
◆ Start volatilizer and heat water to 200 °F or above. A minimum
temperature of 150 °F is required at all times during the
introduction process.
◆ Place fumigant cylinder with gas introduction line on scale and
take initial weight reading. Make sure the gas introduction line is
attached to the cylinder. After obtaining the correct weight,
subtract the dosage to be introduced into the enclosure. After
you have introduced the proper amount of gas, the scale will be
balanced.
◆ Check that tarpaulin is placarded and the area is secured. Only
people working on the fumigation may be in the area.
◆ Check tarpaulin to make sure it is free from rips and tears.
◆ Check that all gas sampling tubes are labeled and are not
crimped or crushed. Inspect tubes visually, or use an electric or
Mityvac hand pump to check tubes. Either a fumiscope or
vacuum pump may be used to test leads for unrestricted flow.
1. Volume = 3,000 ft3
2. Dosage rate = 2 lbs. MB/1,000 ft3
3. Dosage (lbs.) = volume (ft3) × dosage rate (lbs./1,000 ft3)
= 3,000 ft3 × 2 lbs. MB/1,000 ft3
3,000 ft3 × 2 lbs. MB
1,000 ft3
= ---------------------------------------------------
= 6 lbs. MB
Chemical Treatments Fumigants • Methyl Bromide • Tarpaulin Fumigation
Conducting the Fumigation
03/2004-05 Treatment Manual 2-4-19
PPQ
◆ Check that there is enough gas in the cylinder and if necessary,
that other cylinders are available.
◆ Check the gas introduction line connections to make sure they
are tight and free of leaks (wearing the SCBA).
◆ Check all safety equipment, especially SCBA, is available and in
working order.
◆ Install Drierite® tube on gas sample line attached to the T/C unit
and check to make sure granules are blue, if pink—replace
Drierite®. If humidity is high, additional Drierite® tubes or
frequent changes may be necessary.
Conducting the Fumigation
Step 1—Introducing the Gas
Turn on all fans before introducing the gas. When using large
cylinders of MB, have the fumigator open the cylinder valve slightly,
then close the valve. With a halide detector, check all connections on
the gas introduction line for leaks. If leaks are found, advise the
fumigator to tighten the connections and repeat the test. If no leaks
are found, then open the valve to the point where 3 to 4 pounds of MB
Important
When conducting fumigations with methyl bromide, sulfuryl fluoride or
phosphine, erroneous readings may occur if the monitoring leads become
blocked or crimped. It would be impossible to install a new monitoring lead
during a fumigation treatment. Therefore, to avoid an unsuccessful fumigation,
you should test monitoring leads before the treatment begins.
CPHST has developed the following procedure to detect blocked monitoring
　
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