The bilge system is used to remove small quantities of fluid that have leaked or condensed into a dry space
Ballast is taken on to increase a ship’s draught, particularly the stern draught, when sailing without cargo
Piping is used extensively throughout a ship for fire control purposes
a. Sprinkler systems
Small-bore pipes kept permanently charged with freshwater at 10 bar pressure.
b. Water spray systems
Usually small-bore piping, which is dry when not in use. A water spray system is operated manually and looks similar to a sprinkler system
c. Inert gas system
Fitted on all tankers over 20,000 dwt and on all tankers with crude oil washing systems.
d. Deck water spray systems
Fitted on gas tankers, these are prone to rapid corrosion, particularly if not flushed through with freshwater and drained.
e. CO2 piping
Relatively small-bore hot-dipped galvanised mild steel piping designed to withstand the surge pressures and low temperatures that occur with the release of CO2
4. Pipes carrying fuel oil and flammable liquids
Low-pressure pipes are primarily used to move fuel from a storage tank to a service tank and via feed pump on to injection pumps.
High-pressure pipes are used to deliver fuel from an injection pump to an engine combustion chamber
5. Engine cooling systems
Water carried in pipes is used to cool machinery
6.Air and sounding pipes
prevent over- or under-pressure by letting air in or out of the space when liquid is pumped in or out, or when temperature changes cause gases or liquid to expand or contract.
Sounding pipes are small-bore mild steel pipes used to allow the measuring equipment to enter a tank or a space)
Cargo piping in oil tankers may be of stainless steel, but is commonly of mild steel
8.Steam piping systems
Steam is used for indirectly heating oils, water and air