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other spaces that use intake from the vent systems common with
cargo holds
◆ Engine room—recirculation air systems controlled from and
common with the engine room areas—especially on newer ships;
check for drilled holes or other openings in fore and aft
bulkheads of engine room spaces, all engine room vent systems,
and housing or casing leading into spaces to be fumigated
◆ All passageways, engine room, and other crew areas for electric
pipeline or other duct work common with cargo holds
◆ Speaking tubes and fire and smoke detector systems from
fumigated areas
◆ Emergency escape hatches from shaft alley and escape hatches
from all holds
◆ CO2 piping to all cargo holds; degassing systems (older ships)
which usually run from hold to hold
◆ Vents in shaft alley and gear lockers to holds; breaks in bulkhead
◆ Bilge and drainwell vents and drains to all cargo holds
sometimes common with more than one hold or engine room
bilges
◆ Steam-smothering systems for connection between holds
Chemical Treatments Fumigants • Methyl Bromide • Ship Fumigation
Preparing to Fumigate
10/2002-04 Treatment Manual 2-6-9
PPQ
◆ Inner bottom and deep tank covers to ensure that they are closed
prior to fumigating
◆ Galley intake and exhaust systems (may be common with the dry
stores)
Step 11—Measuring Volume
Obtain the volume of the cargo holds from the chief mate, captain, or
the ship’s plan, which is usually posted outside the captain’s office. If
actual hold measurements are available, then figure the volume by
multiplying the length, width, and height of the hold. If actual
measurements are not available, then look on the ship’s plan for the
grain cube. Use the grain cube as the volume in lieu of actual hold
dimensions. Consider all hold areas such as deep tanks, security
lockers, and refrigerated spaces when calculating the volume of the
area to be fumigated.
For dry stores, galleys, and crew quarters, measure the actual
dimensions to calculate volume.
Step 12—Calculating Dosage
The formula for calculating dosage is:
EXAMPLE: Number 3 Hold is infested with khapra beetle. The volume
is 80,000 ft3, and the temperature is 65 °F. The treatment schedule
lists the dosage rate as 6 lbs. MB/1,000 ft3. To calculate the dosage
multiply the volume (80,000 ft3) by the dosage rate (6 lbs./1,000 ft3).
This equals 480 lbs. of MB needed for the dosage.
Step 13—Making a Final Check
Just before introducing the gas, you and the fumigator must do the
following:
◆ Prior to fumigation, use a halide detector to check all storeroom
and reefer areas which have any refrigerating systems prior to
fumigation. A halide detector will indicate any freon leaks. Freon,
a halide gas like MB, will result in higher concentration readings.
Also, after aeration is completed, freon leaks may falsely indicate
that MB is still present within the fumigated area.
◆ Take T/C unit readings to determine if any contaminant gases
are present
◆ Turn on all fans and T/C unit to make sure they work
◆ Start volatilizer and heat water to 200 °F or above
dosage(lbs.) = volume(ft3) × dosage rate(lbs./1,000 ft3)
volume(ft3) × dosage rate(lbs.)
1,000 ft3
= ----------------------------------------------------------------------------
Chemical Treatments Fumigants • Methyl Bromide • Ship Fumigation
Conducting the Fumigation
2-6-10 Treatment Manual 10/2002-04
PPQ
◆ 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. When
the entire dosage has been introduced, the scale will be
balanced.
◆ Check to make sure the ship’s gangway and areas to be
fumigated are properly placarded and the area is secured. A
guard should be present at the entrance to the gangway to
restrict access to the ship. If the crew has been removed, walk
through the quarters and other areas to make sure no one is
aboard.
◆ Check all sealed areas to make sure they are securely taped and
free from holes
◆ Check the gas introduction line connections to make sure they
are tight
◆ Check to make sure all safety equipment is available and in
working order
Conducting the Fumigation
Step 1—Introducing the Gas
Turn on all fans while introducing the gas. When using large cylinders
of MB, have the fumigator slightly open the valve then close the valve.
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