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
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
"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
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
[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.
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.
Cargo compatibility and reactivity of various chemical cargo
Determining presence of contaminants
in chemical cargo
General safety precautions for handling dangerous liquid chemicals in bulk
Closed loading requirement of various grade liquid chemicals and related considerations
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 self reactive chemicals
Handling of toxic chemical cargoes
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