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Sketches and Diagrams of Bilge and Ballast Systems for Marine Machinery Spaces

The function of the bilge system is to be capable of pumping from and draining any watertight compartment within the ship, except for ballast, oil and water tanks. The capacity or size of pumps in the system depend on the size, type and service of the ship.

The function of the ballast system is to pump to and empty all spaces in the ship in which ballast water can be supplied. The suction pipes for the ballast system will be completely separated from the bilge system. The ballast system can also be used for other purposes in emergencies, such as supplying water to the fire main.

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The type of valves used in a ballast system would depend on where they were placed, but most valves would be gate valves or butterfly valves. The type of valve used on a bilge system would be screw down non-return valves.
Bilge system of a general cargo ship

Ballast system of a general cargo ship

bilge injection valve

The function of the bilge injection valve is to remove large amounts of water from the engine room in the event of serious flooding. To do this, the bilge injection valve is opened and the main injection valve is shut, then the largest capacity pumps in the engine room will remove large quantities of water from the lowest point of the engine room. The diameter of the bilge injection valve in relation to the diameter of the main injection valve should be not less than two thirds its size.

Related Info:

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  2. Straight-through cocks, Globe valve,Non-return valves,gate valves,Relief valves, quick closing valves, valve chests....

  3. Mud boxes, Suction pipes, Steam traps, Expansion pieces & Drains for Machinery space piping system
  4. The mud box is a coarse strainer with a straight tailpipe down to the bilge..Suction pipes in tanks should be arranged with a bell mouth or foot..An expansion piece is fitted in a pipeline which is subject to considerable temperature variations..Drains are provided in pipelines and usually have small cocks to open or close them.....

  5. Reciprocating displacement pumping system for ships use
  6. The displacement pumping action is achieved by the reduction or increase in volume of a space causing the liquid (or gas) to be physically moved. The method employed is either a piston in a cylinder using a reciprocating motion, or a rotating unit using vanes, gears or screws.

  7. Centrifugal pump principles and working procedure
  8. In a centrifugal pump liquid enters the centre or eye of the impeller and flows radially out between the vanes, its velocity being increased by the impeller rotation....

  9. How a pneumatically control valve works ?
  10. Many pneumatic devices use a nozzle and flapper system to give a variation in the compressed air signal.A typical pneumatic control valve is shown in Figure . It can be considered as made up of two parts—the actuator and the valve. A flexible diaphragm forms a pressure tight chamber in the upper half of the actuator and the controller signal is fed in.....

  11. Domestic water systems for general cargo ship
  12. Domestic water systems usually comprise a fresh water system for washing and drinking and a salt water system for sanitary purposes . Both use a basically similar arrangement of an automatic pump supplying the liquid to a tank which is pressurised by compressed air...

  13. Bilge and ballast systems for general cargo ships
  14. The bilge main is arranged to drain any watertight compartment other than ballast, oil or water tanks and to discharge the contents overboard. The number of pumps and their capacity depend upon the size, type and service of the vessel.....

Marine machineries - Useful tags

Marine diesel engines ||Steam generating plant ||Air conditioning system ||Compressed air ||Marine batteries ||Cargo refrigeration ||Centrifugal pump ||Various coolers ||Emergency power supply ||Exhaust gas heat exchangers ||Feed system ||Feed extraction pump || Flow measurement || Four stroke engines || Fuel injector || Fuel oil system || Fuel oil treatment ||Gearboxes || Governor || Marine incinerator || Lub oil filters || MAN B&W engine || Marine condensers || Oily water separator || Overspeed protection devices || Piston & piston rings || Crankshaft deflection || Marine pumps || Various refrigerants || Sewage treatment plant || Propellers || Power Plants || Starting air system || Steam turbines || Steering gear || Sulzer engine || Turbine gearing || Turbochargers || Two stroke engines || UMS operations || Drydocking & major repairs || Critical machinery || Deck machineries & cargo gears || Control and instrumentation ||Fire protection ||Engine room safety ||

Machinery is about working principles, construction and operation of all the machinery items in a ship intended primarily for engineers working on board and those who working ashore . For any remarks please Contact us

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