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SAFETY4SEA

Procedures: How to conduct a safe cargo fumigation

by The Editorial Team
September 6, 2018
in Maritime Knowledge
cargo hold cleaning

Above image is used for illustration purposes only

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As one of the most challenging operations for solid cargo trade, the safe transportation of grain cargo requires several hazards and parameters to be considered and many measures to be taken. Fumigation is one of these. Fumigants are chemicals which, under certain conditions, will enter a gaseous state and, in sufficient concentration, will be lethal to pest organisms that are considered detrimental for the condition of most grain cargoes. But under which circumstances can fumigation take place?

The ship’s cargo can be fumigated and ventilated:

  1. While stored prior loading,
  2. In the hold of the ship before departure,
  3. In the hold prior to departure with fumigation continued during the voyage (intransit).

In these situations, the fumigation continues during the voyage and is not finished until the ventilation and removal of residues is completed, which is normally at the first discharge port.

When a ship is fumigated, the detailed recommendations contained in the Recommendations on the Safe Use of Pesticides in Ships should be followed. Spaces adjacent to fumigated spaces should be treated as if fumigated.

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Fumigants act in a gaseous phase, even though they may be applied as solid or liquid formulations from which the gas arises. Effective and safe use requires that the space being treated be rendered gastight for the period of exposure, which may vary from a few hours to several days, depending on the fumigant type and concentration used, the pests, the commodities treated and the temperature.

Since fumigant gases are poisonous to humans and require special equipment and skills in application, they should be used by specialists and not by the ship’s crew.

Real life incident

A vessel departed Liepaja, Latvia, bound for Antwerp, loaded with a full cargo of wheat in all three holds. Cargo was fumigated and six pieces of 10 mm diameter plastic tubes were hung from the hatch coamings to the tank tops of each hold prior to starting the loading.

When the cargo had been loaded, aluminium phosphide tablets were spread on top and dropped into the tubes. Hatch covers and ventilators to the cargo holds were closed and plastic bags were placed around the coaming drains. In the accommodation, the main ventilation system was closed down, but people were allowed to use the extraction fans from their bathroom/WC. Outside doors were closed and people were ot allowed to go out on deck, unless it was necessary for the operation of the vessel. Two gas masks with eight filters and one gas detection kit with 50 detection tubes were delivered to the vessel by the fumigators who advised that the cargo holds could be opened again after five days.

The crew members were not very familiar with the use of the kit, and the date limit of the detection tubes expired during the voyage. Four days after the start of the fumigation, during anchoring to wait for a berth, a seaman complained about feeling ill, with a slight temperature and vomits.

Having spent 48 hours in his cabin, the seaman was found dead in his bed. Two days later, the second officer also became sick, but recovered.

There was no odour of gas, but when tests were carried out, a high concentration of phosphine gas was detected in spaces within the accommodation.

The deceased seaman’s cabin was on main deck level, in front of the accommodation and next to the captain’s office. When the lining of the office was pulled down, a small corroded hole was found in the front bulkhead. That steel plate was the common boundary with the aft ventilator from the aft cargo hold.

Corrosion within the ventilator over many years had made a small opening for the gas in the cargo hold to pass to the insulation of the accommodation walls. The extraction fans from the toilets created a slight under-pressure, sufficient to draw the gas, which escaped to the cabins wherever there was an opening.

Safety Tips

  • A “fumigator-in-charge” should be designated by the fumigation company. He should be able to provide documentation to the master proving his competence and authorization.
  • The master should be provided with written instructions by the fumigator-in-charge on the type of fumigant used, the hazards to human health involved and the precautions to be taken, and in view of the highly toxic nature of all commonly used fumigants these should be followed carefully. Such instructions should be written in a language readily understood by the master or his representative.
  • As breathing masks should be provided for seamen, demonstration of the correct use is to be performed.
  • Accommodation spaces should be checked for inadequate isolated penetrations. In all cases, if a penetration is required, it should be covered by class approval.
  • Warning posters should be in place to prevent entrance to all dangerous spaces.
  • Risk Assessment should be performed to address all related hazards.

SQE has developed a sample of toolbox meeting in order to be used as guidance onboard.

read more here

 

PROCEDURES: Read in this series

ship contacts berth

Procedures: A guide to safe passage planning

November 1, 2018
Authorized Service Providers

Procedures: A step-by-step guide for safe abandon-ship drills

October 25, 2018
sts transfers

Procedures: Step-by-step stages of a proper STS transfer

October 19, 2018
containership fire

Procedures: Steps for a proper fire drill under SOLAS

October 4, 2018

Procedures: Tips for safe Fuel Oil Changeover before entering ECAs

September 21, 2018
food hygiene onboard

Procedures: How to maintain food hygiene onboard

September 19, 2018
cargo hold cleaning

Procedures: How to conduct a safe cargo fumigation

September 6, 2018
enclosed space entry

Procedures: A toolbox meeting guide for enclosed spaces

August 28, 2018
mooring

Procedures: Mooring line handling tips

August 23, 2018
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