5.1.1 Push stems are to be fitted on pusher tugs and are to comply with the requirements given in Pt 3, Ch 5, 4.6 Stem arrangement for pushing purposes. It is recommended that ships primarily used for pushing will be equipped with a twin push stem as indicated in Figure 5.4.2 Loads on stem for pushing purposes in Pt 3, Ch 5.
5.1.2 Ships constructed for pushing duties are to be equipped with adequate coupling arrangements, such as winches and wires.
5.2.1 The deck structure in way of winches for coupling wires and under windlasses is to be suitably strengthened.