Compressed Air Systems on Ships, Schemes and Mind Maps of Mathematics

An overview of the use of compressed air on ships, including the different purposes it serves, the various types of air compressors used, and the key components and mountings of the air reservoirs. It covers the high-pressure air used for main engine starting, as well as the lower-pressure service air used for a variety of applications such as starting auxiliary engines, charging water systems, and operating pneumatic tools. The document also discusses the importance of pressure reduction valves, compensation rings, and safety features like fusible plugs and relief valves. This information would be useful for students studying marine engineering, ship operations, or related fields to understand the critical role of compressed air systems in the functioning of a ship.

Typology: Schemes and Mind Maps

2020/2021

Uploaded on 07/05/2022

saravanan-08
saravanan-08 🇨🇳

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Learnings from SES
Compressed air on ships is used for different purposes. High-
pressure air of 30 bar is mainly used for the main engine
starting.
This high-pressure air is reduced to lower working pressures
through pressure reduction valves and is used for other
important purposes.
The air at reduced pressures of 7-8 bar is used as service air
for a number of applications.
Some of these include starting of Auxiliary Engines,
Emergency Generators, Charging of freshwater and drinking
water hydrophores, blowing the fog horn, spring air for
exhaust valves of the Main Engine, dry washing of Main
Engine turbochargers, for use in sewage treatment plants for
aerobic sewage breakdowns, soot blowing of boilers,
pneumatic pumps for oil transfers and many more
applications such as service air for the use of cleaning,
painting operations, chipping and operation of pneumatic
tools such as grinders, chisels etc.
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Learnings from SES

Compressed air on ships is used for different purposes. High- pressure air of 30 bar is mainly used for the main engine starting. This high-pressure air is reduced to lower working pressures through pressure reduction valves and is used for other important purposes. The air at reduced pressures of 7-8 bar is used as service air for a number of applications. Some of these include starting of Auxiliary Engines, Emergency Generators, Charging of freshwater and drinking water hydrophores, blowing the fog horn, spring air for exhaust valves of the Main Engine, dry washing of Main Engine turbochargers, for use in sewage treatment plants for aerobic sewage breakdowns, soot blowing of boilers, pneumatic pumps for oil transfers and many more applications such as service air for the use of cleaning, painting operations, chipping and operation of pneumatic tools such as grinders, chisels etc.

  • (^) Setting pressure 32 bar (for a 30-bar working pressure) with equal to or greater than 10% rise in accumulation of pressure may be fitted directly or with extension.
  • (^) 4. Compensation Ring
  • When a hole is cut or machined into a pressure vessel, higher stresses will subject to the material around the hole, and to reduce this, compensation rings are fitted.
  • (^) It is a flange on which a valve or fitting is usually mounted. A compensation ring provides for structural integrity in the air pressure vessel.
    1. Manual Drain valve or Automatic Drain valve
  • (^) 6. Pressure gauges
  • (^) 7. Access doors
  • (^) Air Reservoir Mountings
  • Each air reservoir should be equipped with the following mountings:
  • (^) 1. Fusible Plug
  • Composition – Bismuth 50%, Tin 30%, Lead 20%
  • (^) Melting Point: 220deg F (104.4deg cel) Fitted at the reservoir’s bottom or on the reservoir at the ship side when a relief valve (safety valve) is not directly fitted on the reservoir.
  • It is fitted to release the compressed air in the event of abnormally high compressed air temperature.
    1. Atmospheric Relief Valve
  • (^) It is provided as over-pressure protection and as a back-up of the fusible plug.
  • (^) In case of an Engine Room fire when CO2 flooding is required, this valve is to be opened before evacuating the engine room.
  • (^) (The air receiver relief valve opening could either open outside the engine room through the ship’s funnel or inside the engine room itself. In case of the latter, CO bottle calculations for fighting a fire in the Engine room is done accordingly and the extra CO2 required is taken into consideration at the ship’s design stage) FIG. Spring Loaded Safety Valve