Measures to prevent or reduce flooding

Service the outer part of the pipes, tighten the loose supports and replace the broken U-bolts on the pipe holders, thus reducing the wear of the pipes due to friction on the supports.
Open / close all the ship's side valves regularly (weekly whenever possible) so that they can be easily closed / opened if necessary. Valves, such as suction valves for fire pumps, which are normally open to prevent salt build-up, should be closed and reopened regularly.
Before opening the seawater filters for cleaning (a - Fig. 6), make sure that all shut - off valves are closed and tight. To do this, open the deaeration valve on the filter. Always open the cover by lifting it before removing all cover screws. This should also apply to the opening of coolers and piping anywhere in the system. Care must always be taken when removing the covers or opening any part of the seawater system, as the valve that appears to be closed may be partially or even fully open.

Example of emergency pumping of flooded water in machinery spaces

All employees should be familiar with the various drainage schemes and be able to take advantage of any of them if necessary. They should also know the main valves, pumps behind the inlet water intake and orientate which ones are currently in use, that is: running, being open or closing.
The emergency drain suction valve (b - Fig. above) must be opened / closed and lubricated regularly. Valves and covers for double bottom cavity measuring pipes shall be closed and secured when not in use.
Sludge water suction filters-sieves (c - Fig. above) should be inspected and cleaned whenever possible, as they will be difficult to clean in the event of flooding. Frequent inspection and cleaning will reduce the risk of clogging the sieve.
The main on - board and bottom Kingston intake valves (c - Fig. above) are operated hydraulically remotely or by emergency emergency pumps.
During the emergency drainage operation of the engine room using the on-board water cooling system, the main cooling pumps behind the on-board water no. 1 and no. 2, and pump no. 3 operated manually. The pump suction valve from outside the Kingston onboard water is closed or completely closed if necessary. The pump discharges the pumped-in water to the central coolers behind the on-board water, and the water is discharged from the overboard. The back pressure on the pump can be reduced by opening the backwash valves on the heat exchangers.