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upon the size of the structure being fumigated, you may want to have
several gas introduction lines going into the structure to shorten the
time required for gas introduction. Attach introduction lines to the top
of the fans to prevent movement of the hose. Place a piece of
nonpermeable sheeting (example—plastic or rubberized canvas) over
the commodity in front of and below each gas introduction line. The
sheet will prevent any liquid MB from coming in contact with the cargo
and will prevent damage.
The other option of gas introduction is to release MB from inside the
building. If this option is selected, cylinders should be placed by a
team of two people and the location of each cylinder in the building
should be mapped. The cylinders should be arranged so that
fumigators can walk away from the released gas as they open each
subsequent cylinder.
Because MB is heavier than air, it is advisable to increase slightly the
amount of gas released on the top floor. Cylinders should be placed
within a room for best distribution into all areas. Cylinders should be
placed in an upright position and the shipping caps removed.
Because MB is heavier than air, it is advisable to attach standpipes (or
curved pipes directed slightly upward) to the cylinder valves in order to
reduce stratification at lower levels in the structure. If standpipes are
used, they should be equipped with “T” fittings to direct the gas
laterally and to prevent direct contact with the ceiling.
If the “inside release” option is used, provision must be made to have
equipment in place to use the gas method of hot gas introduction to
add fumigants as necessary to all areas of the structure.
dosage(lbs.) = volume(ft3) × dosage rate(lbs./1,000 ft3)
volume(ft3) × dosage rate(lbs.)
1,000 ft3
= ----------------------------------------------------------------------------
Chemical Treatments Fumigants • Methyl Bromide • Structure Fumigation
Preparing to Fumigate
2-7-12 Treatment Manual 10/2002-04
PPQ
You must be present during the introduction of the fumigant to ensure
that the correct dosage is introduced into the enclosure.
Step 12—Making a Final Check
Just before introducing the gas, you and the fumigator must do the
following:
◆ Make sure building is clear of all personnel and animals
◆ Make sure all areas requiring sealing are sealed
◆ Check the placement and identification of gas introduction lines
and gas sampling tubes
◆ Turn on all fans and T/C unit to make sure they work
◆ Check that the tarpaulin is placarded with warning signs on all
sides of the building
◆ Take T/C unit readings to determine if any contaminant gases
are present (contaminant gases may affect concentration
readings)
◆ Check that all gas sampling tubes are labelled and not crimped
or crushed by attaching to T/C unit and watch the air flow meter
to ensure that air is getting through
◆ Check that there is enough gas for dosage and additional gas in
case you need to add gas
◆ Start volatilizer and heat water to at least 200 °F or above
◆ Place fumigant cylinders 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. When
you have introduced the proper amount of gas, the scale will be
balanced
◆ Check gas introduction line connections to make sure they are
tight
◆ Install Drierite® tube on gas sampling lines of T/C unit making
sure the Drierite® granules are blue in color and have not turned
pink
◆ Make sure all safety equipment is present and in working order
Chemical Treatments Fumigants • Methyl Bromide • Structure Fumigation
Conducting the Fumigation
10/2002-04 Treatment Manual 2-7-13
PPQ
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 slightly open the cylinder valve
then close the valve. 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. Also, check all
areas which are sealed. If you find a leak and it cannot be readily
corrected, evacuate this partial dosage and reseal the area. If no leaks
are found, then open the valve to the point where 3 to 4 pounds of MB
are being introduced per minute. The gas introduction line should
always be hot and the volatilizer should read at least 150 °F.
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