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Handling precautions for self reactive chemicals

Cleanliness: Before loading self reactive substances onboard chemical tanker, a responsible Officer must ensure that there are no traces of other substances, which may promote self-reaction of the cargo to be loaded in the cargo tanks and the cargo systems.

Certificate of Inhibition

Care must be taken to ensure that the cargoes are sufficiently inhibited to prevent polymerisation during the entire voyage. When the ship carries such cargoes, a Certificate of Inhibition in which the following items are shown must be given by the shipper, or the manufacturer of the cargoes: The Company and Charterers must be informed immediately if a product inhibitor certificate is not made available.

Cargo Tanks Vent System

The cargo tanks vent system must be regularly checked for adequacy of operation to avoid blockage from polymer build-up.

Temperature Control

The effectiveness of the inhibitor in a cargo may be reduced if the cargo temperature exceeds the value shown in the certificate of inhibitor content. Care must be exercised to maintain the temperature well within these limits to maintain the effectiveness of the inhibitor. When the loading plan for the voyage is prepared, the location of tanks with self reactive cargoes is to be considered carefully, to avoid loading next to heated cargoes or bunkers.

Crystallisation or solidification of cargoes, normally carried in the molten state, can lead to depletion of the inhibitor in parts of the tank contents. Subsequent remelting can yield pockets of inhibited liquid with the accompanying risk of dangerous polymerisation. To prevent this, care must be taken to ensure that at no time are such cargoes allowed to crystallise or solidify, either wholly or partially, in any part of the tank by using the appropriate ‘agitation’ method.







Related Info:

Voyage planning and related considerations

Cargo sampling safety precautions

Preparation for cargo operation

Preparing a cargo tank atmosphere

Cargo unloading operation safety precautions

Liaison between ship and shore

Cargo care during transit

Ship shore safety checklist while alongside a terminal

Loading, discharging & care of Phenol - Safety guideline

Hazards of Phenol - safe handling of Phenol on chemical tankers.

Handling benzene & methanol safety precautions

Personal protective equipments for carcinogens & cyanide-like cargoes onboard chemical tankers

Handling ACRYLONITRILE safety precautions

handling ISOCYANATES safety precautions

Loading, carrying & discharging of Sulphuric acid - regulatory requirements & special handling methods

Product characteristics & special arrangements for carrying Phenol onboard

Handling various grade liquid chemicals during loading

How to prepare a cargo loading or discharge program ?

How to avoid solidification in cargo tanks ?

Cargo line clearance requirement for chemical tankers

Cargo segregation requirement for chemical tankers

How to arrange disposal of tank cleaning waste ?

Restrictions on discharge cargo residue into sea

Retention of slops on chemical tankers

Vapour emission control requirement for chemical tankers

Handling of toxic chemical cargoes


Following reference publications provide useful guidance and international regulations for carrying hazardous chemicals at sea.



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