Chemical Tanker Guide Online

Cargo compatibility chart for ships carrying dangerous chemicals in bulk

Definition of hazardous reaction- As a first approximation, a mixture of two cargoes is considered hazardous when, under specified condition, the temperature rise of the mixture exceeds 25 degree C or a gas is evolved.

It is possible for the reaction of two cargoes to produce a product that is significantly more flammable or toxic than the original cargoes even though the reaction is nonhazardous from temperature or pressure considerations.

Chart format - There are different degrees of reactivity among the various cargoes. Many of them are relatively non-reactive: For example, aromatic hydrocarbons or paraffins. Others will form hazardous combinations with many groups: For example, the inorganic acids.

The cargo groups in the compatibility chart are separated into two categories: 1 through 22 are "Reactive Groups" and 30 through 43 are "Cargo Groups". Left unassigned and available for future expansion are Groups 23 through 29 and those past 43. Reactive Groups contain products which are chemically the most reactive; dangerous combinations may result between members of different Reactive Groups and between members of Reactive Groups and Cargo Groups. Products assigned to Cargo Groups, however, are much less reactive; dangerous combinations involving these can be formed only with members of certain Reactive Groups. Cargo Groups do not react hazardously with one another.

Using the compatibility chart

The following procedure explains how the compatibility chart should be used to find compatibility information:

1. Determine the group numbers of the two cargoes by referring to the alphabetical listing of cargoes and the corresponding groups. Many cargoes are listed under their parent names: unless otherwise indicated, isomers or mixtures of isomers of a particular cargo are assigned to the same group. For example, to find the group number for Isobutyl Alcohol, look under the parent name Butyl Alcohol Similarly, the group number for para-Xylene is found under the entry Xylene. If a cargo cannot be found in the listing, contact the Coast Guard for a group determination (see CFR 150.140).

2. If both group numbers are between 30 and 43 inclusive, the products are compatible and The chart need not be used.

3. If both group numbers do not fall between 30 and 43 inclusive, locate one of the numbers on the left of the chart (Cargo Groups) and the other across the top (Reactive Groups).

[Note that if a group number is between 30 and 43, it can only be found on the left side of the chart]. The box formed by the intersection of the column and row containing the two numbers will contain one of the following:

(a) Blank - The two cargoes are compatible. (b) "X" - The two cargoes are not compatible [Note that reactivity may vary among the group members. Note if the products in question are referenced by a footnote which indicates that exceptions exist, then refer to in Appendix I. Unless the combination is specifically mentioned in Appendix I, it is compatible.

Compatibility chart

Please refer to US Coast Guard 46 CFR Part 150 and check for cargo compatibility for each cargo to be stowed and also for stowing cargo samples in sample locker.

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