Contaminants in Pneumatic Control Systems Air Supply
Here’s a look at three common contaminants in the air supply for pneumatic control systems and why they’re undesirable:
(a) Three Contaminants:
- Moisture (Water Vapor): This is a prevalent contaminant in compressed air systems.
- Solid Particles (Dust, Dirt): These can enter through leaks or from the environment.
- Oil (Lubricating Oil): Oil carryover can happen from compressors or from lubricated moving parts within the system.
(b) Why These Contaminants Are Undesirable:
- Moisture (Water Vapor):
- Corrosion: Water reacts with metal components in valves, cylinders, and pipelines, leading to rust and premature wear.
- Freezing: In cold environments, water can freeze and cause blockages or damage components.
- Reduced Lubricity: Water weakens the lubricating film formed by condensed moisture in the system, increasing friction and wear.
- Solid Particles (Dust, Dirt):
- Abrasion: Particles can cause wear and tear on internal components, reducing efficiency and lifespan.
- Sticking Valves: Particles can jam or restrict movement in valves, affecting system operation.
- Filter Clogging: Particles can clog filters, reducing air flow and potentially leading to pressure drops.
- Oil (Lubricating Oil):
- Valve Malfunction: Oil can coat spools and seals in valves, causing them to stick or malfunction.
- Contaminated System Components: Oil can contaminate downstream components like sensors and actuators, affecting their performance.
- Fire Hazard: In some applications, oil contamination can create a fire hazard, especially near high-temperature components.