The units are plugged into the ships electrical system by way of suitable deck sockets. On deck refrigerated containers are generally serviced by clip-on air cooled electric motor drive cooling units.
If provision is only made for the ship to carry a part load of under deck refrigerated containers these are generally arranged in the after holds adjacent to the machinery space. On the ships sides, bulkheads and deckhead about 50 mm of foam insulation with a fire retardent coating may be fitted and the tank top covered with 75 mm of cork and bitumastic. The below decks system described with fully insulated containers means that heavy insulation of the hold space is unnecessary. Connection of each container to the cold air ducts is by means of an automatic coupling which is remotely controlled and can be engaged when the container is correctly positioned in the cell guides. Air from the brine coolers is ducted to and from each insulated container. The ISO containers (usually 20 foot size since with most refrigerated cargoes 40 foot size would be too heavy) are insulated, and below decks the end of each hold may be fitted with brine coolers which serve each stack of containers. Many of the container ships operating on trade routes where refrigerated cargoes were carried in conventional refrigerated cargo liners ('reefer ships') have provision for carrying refrigerated containers and have in many cases replaced the latter.
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