For the purpose of applying various safety standards to
pusher tug-barge combinations, these should, when nothing else is
specified in the standard in question, be categorized as type A or
type B, where;
1.1 Type A is a pusher tug-barge combination,
which does not have the characteristics of a type B combination.
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1.1.1 A tug-barge combination, where the coupling
is achieved by a completely rigid connection such as a bolt connection,
should be regarded as type A, as well as a combination where the pusher
can be manoeuvred by remote control from the barge.
1.2 Type B is a pusher tug-barge combination with
the following characteristics:
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1.2.1 The connection system should permit the
pusher to move in relation to the barge.
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1.2.2 The connection system should permit the
pusher to be easily disconnected from the barge. This should be tested
in harbour conditions and should be achieved by one person in less
than 5 minutes.
1.3 This categorization is not intended to preclude
any established interpretation of the words "rigidly connected" in regulation 12(s) of chapter V of the
1974 SOLAS Convention or Rule 24(b) of the 1972 Collision Regulations.