Section 7 Water cooler refrigeration units

7.1.1 A minimum of two independently operated circulation pumps are to be installed. One of the pumps may be used for other services, such as a general service pump.

7.1.2 The capacity of each pump should be sufficient to supply each container at the required flow rate with an excess capacity of at least 10 per cent. This required flow rate should be obtained from the container manufacturer.

7.1.3 The fresh water system is to provide sufficient flow and even distribution to each container location. This is to be achieved using all possible combinations of fresh water pumps and dedicated refrigerated container cells.

7.1.4 The temperature of the cooling water is to be maintained in accordance with the container manufacturer's recommendations.

7.1.5 Flexible hoses are to be utilised for connecting the water supply and return pipes. The connectors on the ends of the flexible hoses are to be of a type that self-closes on disconnection. Adequate valves are to be provided to allow isolation of each cargo hold sub-circuit in the event of a leak or pipe fracture.

7.1.6 A minimum of two fresh-water to sea-water heat exchangers are to be provided. Each is to be rated at 100 per cent of the required cooling duty at the notation conditions. The second heat exchanger may be a standby or part of a common central system such as that used for main engine cooling duties. The heat exchangers are to be supplied by a minimum of two separate sea-water pumps.

7.1.7 If metal pipes are used, the contents of Pt 5, Ch 12, 11.8 Metal pipes for fresh water services are to be given due consideration.