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Title:

Compressed Air Systems

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Air Compressors. Type of displacement. Positive: used for high pressures ... Storage tanks for reserve air capacity. Used on ALL compressors to lower pulsations ... – PowerPoint PPT presentation

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Title: Compressed Air Systems


1
Compressed Air Systems
order up a two-can jam in the back of the
bus! - EM2(SS) Barrow
2
Introduction
  • Air systems are vital to ship operations
  • Starting diesel and gas turbine engines
  • Torpedo ejection
  • Deballasting air (EMBT Blow)
  • Prairie masker
  • Compressed air represents stored energy - capable
    of doing work at a later point
  • Used extensively both in high pressure and low
    pressure applications

3
Air Compressors
  • Used to compress air from inlet pressure (atm) to
    a higher pressure (PV a RT)
  • Classified according to
  • Type of displacement
  • Staging
  • Type of Drive (prime mover)
  • Operating Pressure
  • Capacity

4
Air Compressors
  • Type of displacement
  • Positive used for high pressures
  • Non-positive used for lower pressures
  • Staging
  • Number of compression steps used in compression
    process
  • Type of drive system
  • Classified according to prime mover (almost all
    electric motors)

5
Air Compressors
  • Operating (discharge) pressure
  • Low (lt151 )
  • Medium (151-1000 )
  • High (gt1000 )
  • Capacity
  • Volume of air compressed
  • CFM (cubic feet per minute)

6
Non-Positive Displacement
  • Centrifugal compressor
  • Radial flow
  • Axial Compressor
  • Axial Flow

7
Positive Displacement
  • Reciprocating Piston
  • Piston assembly with valves to control flow
  • Can either be single stage or multi-stage

8
Positive Displacement
  • Rotary Compressor
  • Rotary sliding vane (not used)
  • Rotary impeller (low press/ high CFM
    applications)
  • Liquid piston (not used much)

9
Positive Displacement
  • Rotary Compressor
  • Rotary sliding vane (not used)
  • Rotary impeller (low press/ high CFM
    applications)
  • Liquid piston (not used much)

10
Positive Displacement
  • Rotary Compressor
  • Rotary sliding vane (not used)
  • Rotary impeller (low press/ high CFM
    applications)
  • Liquid piston (not used much)

11
Support Systems
  • Cooling
  • Most cooled by fresh water systems
  • Remove heat from compression process
  • Intercoolers used between stages
  • Aftercooler used after final discharge
  • Receivers
  • Storage tanks for reserve air capacity
  • Used on ALL compressors to lower pulsations
  • Safety features
  • Auto shutdown

12
Specific Uses of Air
  • High Pressure
  • Torpedo Ejection
  • Emergency Blow
  • Hydraulics
  • Remotely-operated valves
  • Low Pressure
  • Prairie Masker system
  • Potable water
  • Pneumatic tools valves

13
Questions?
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