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approximately 125,000 ft3. Use one additional lead for every 50,000 ft3
over 125,000 ft3.
When cargo is present in the hold, place two additional gas sampling
tubes in the commodity at each hold level. For mixed cargo, place
additional gas sampling tubes in the cargo considered to be the most
difficult for the fumigant to penetrate.
Step 7—Placing the Gas Introduction Lines
Storerooms,
Galley, Quarters
Numerous gas introduction lines may be necessary in order to obtain
even gas distribution throughout the fumigation area. Place the gas
introduction line directly through an opening from the outside
(example—a door or window) directly above a fan. Attach the
introduction line securely to the top of the fan to prevent movement of
Chemical Treatments Fumigants • Methyl Bromide • Ship Fumigation
Preparing to Fumigate
10/2002-04 Treatment Manual 2-6-7
PPQ
the hose. An unsecured introduction line could move the line out of
the airflow. Place a piece of nonpermeable sheeting (example—plastic
or rubberized canvas) over the commodity in front of and below each
gas supply line. The nonpermeable sheet will prevent any liquid MB
from coming in contact with commodities and will prevent damage.
Cargo Holds Numerous gas introduction lines may be necessary in order to obtain
even gas distribution throughout the fumigation area. Place the gas
introduction line directly into the air stream in front of one of the fans
on the upper ’tween deck. Attach the introduction line securely to the
top of the fan because gas passing through the line will cause the line
to vibrate. An unsecured introduction line could be moved out of the
airflow. Additional introduction lines can be used to hasten
introduction and distribution of the gas. 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 prevent damage.
Step 8—Measuring the Temperature
Take temperature readings of the air (space) and of the commodity.
Use a calibrated thermometer. Record the temperatures in Block 22 on
the PPQ Form 429. If the temperature is below the minimum listed for
the treatment schedule, then you will need to heat the hold or other
space to be fumigated.
Step 9—Heating the Cargo Hold
If heating a hold is necessary, negotiate the method with the fumigator
and get the concurrence of the Center for Plant Health Science &
Technology (CPHST), in Raleigh, North Carolina.
Step 10—Sealing Stores
One of the most important steps in preparing for a ship fumigation is
sealing all openings and areas which have the potential to leak gas.
Consider the entire area to be fumigated as a natural atmospheric
chamber and make the area as gastight as possible. The most
important task is to locate all openings (example—drain pipes, bilge
drain holes, or air ducts) and seal them.
TABLE 2-6-1: Determine Pre-fumigation Procedures
If the temperature is: Then:
At or above the minimum temperature listed for the
treatment schedule
GO to Step 10 (Sealing Stores)
Below the minimum temperature listed for the treatment
schedule
GO to Step 9 (Heating the Cargo
Hold)
Chemical Treatments Fumigants • Methyl Bromide • Ship Fumigation
Preparing to Fumigate
2-6-8 Treatment Manual 10/2002-04
PPQ
Do not seal out or make gastight recessed areas, ducts, or similar
apertures which may harbor an infestation. In some cases it is better
to seal sources of leaks on the outside of the area to be fumigated. Use
caulking compound or tape for sealing small spaces. For sealing larger
areas, use polyethylene or similar material secured with tape or
adhesive spray. Seal doors and other openings with either
polyethylene or spray with vinylite plastic. When practical, seal air
ventilation ducts on the outside of the space being fumigated so
sealing tape can be removed when you get ready to evacuate the gas
and begin aeration. Large openings such as hatch cover openings
should be covered with polyethylene and securely taped. When
necessary, lace rope across the tarpaulin to prevent billowing in high
winds. Look for and seal off the following ship areas when preparing a
ship for fumigation:
◆ Wall plates
◆ Air vents
◆ Drains
◆ Pipes and other utility conduits through decks and bulkheads
◆ Dumb-waiter openings
◆ Heating, air conditioning, and ventilation systems common with
or to cargo holds, engine room, crew quarters, storerooms, or
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