Fill in the gaps with the following words: nowadays, alter, therefore, mounted, list, stringent, fitted, stability, anti-heeling, transfer, handling, minimize, change over, blanked, appropriate, handling, required, remote, separate, discharge
Several suction lines are on a manifold.
Suction lines are with valves.
Depending on and trim, we choose which bilge well the water is collected in.
The ballast system is used to pump seawater in or out of the ballast tanks. The rules for the ballast system are less than the rules for bilge systems. Some reasons for taking ballast on board or shifting ballast once it is on board include:
to improve of the ship, especially when the ship does not carry cargo
to the trim
to control the list during loading and discharge. Many ships use an system for this purpose
to improve manoeuvrability
An anti-heeling system is used to the list (in port). Pumps with large capacity (1000 m³/hour) are installed between two tanks (one port side and one starboard). These pumps can water from one tank to the other at great speed. The system is fully automatic and much used on ships with cranes, container vessels and Ro-Ro vessels to reduce the list that can occur during cargo .
Contrary to the valves in the bilge arrangement, the valves in the ballast arrangement have to be two-way valves as the tanks must be able to be filled and emptied. the ballast system is often designed as a line. controlled valves are used to empty or fill the ballast tanks.
Combined or mains for suction and may be provided. Where a tank or cargo space can be used for ballast or dry cargo, then either a ballast or bilge connection will be . The system must be arranged so that only the pipeline is in service; the other must be securely or closed off. Where tanks are arranged for either oil or ballast, a chest must be fitted in the pipeline so that only the ballast main or the oil transfer main is connected to the tank.
