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Chemical cargoes segregation and compatibility

Why segregation? : In the case of two or more liquid chemical cargoes which react with one another in a hazardous manner, segregation must be done The product data sheets, together with the BCH/IBC Codes are to be studies carefully to determine the compatibility restrictions when carrying different groups of cargoes.

Regarding slops reacting with each other in a hazardous manner, these must not be collected in the same slop tank nor transferred through the same pipes.

Compatibility with Water / Stowage of Heated Cargoes

Some chemical cargoes are not compatible and may even be reactive with water therefore, due consideration is necessary to avoid stowage of such cargoes adjacent to the water ballast tanks. It is also a requirement that the heating coils are to be blown through, cleaned and blanked off, or thermal oil used as a heating medium.

It is recommended that a cargo to be heated is not stowed adjacent to cargoes which have a low boiling point because the excess evaporation will result in consequent cargo loss and possible vapour hazards. As a safe margin, the maximum temperature of the heated cargo must be 10°C below the boiling point of the unheated cargo.

Heated cargoes must never be stowed adjacent to self-reactive cargoes since excess heating of self-reactive cargoes will shorten the life of the stabilising inhibitor 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.


Compatibility with the Coatings of the Cargo Tanks

The suitability of the coating of tanks for loading various chemicals and products must be checked against the paint manufacturer’s data sheets before cargoes are assigned to tanks. Also temperature limits imposed by the relevant coatings are not to be exceeded.

Epoxy coatings are capable of absorption of certain chemicals, which could later be released resulting in contamination of future cargoes and possible safety hazards. Similarly “metal pick-up” form recently applied zinc coatings could contaminate sensitive cargoes.





Edible Oils Compatibility

Toxic chemicals, as defined in the BCH/IBC Code, must not be carried as the last cargo immediately prior to edible oils or stowed in adjacent tanks sharing common bulkheads with tanks containing edible oils. Likewise, lengths of pipeline serving tanks containing such toxic products must never run through tanks containing edible oils and vice versa.

For details, refer to FOSFA International (Federation of Oils, Seeds and Fats Association) published lists and procedures.

The FOSFA International “Operation Procedure for Ocean Carriers of Oil and Fats for Edible and Oleao-Chemical Use” requires that the immediate previous cargo for the tanks, lines and pump system designated to load and fats must have been on the FOSFA International “List of Accepted Previous Cargoes or not on the FOSFA International “List of Banned Previous Cargoes” currently in force whichever is appropriate.



Related Info:

Cargo compatibility and reactivity for ships carrying dangerous chemicals in bulk

Cargo compatibility chart for handling dangerous liquid chemicals in bulk

Cargo handling safe practice for chemical products

Risk with noxious liquid cargo contact

Poisoning and required first aid treatment onboard

How take a sample of noxious liquid cargo ?

Determining water contamination in chemical cargo

Chloride contamination in chemical cargo - how to resolve?

Varoius product contamination in chemical cargo - how to resolve?

Using acid wash method for a cargo of aromatics contaminated by a previous oil cargo

APHA (Hazen) method for determining color of very light chemical products

Use of Oxygen analysers

Cargo vapour detection equipment



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