Steam Trap and Balancing Piston Quiz

Balancing Piston (Diaphragm)

• The diaphragm's compression rate is constant.
• The stationary part of the compressor is the diaphragm, which aims to keep the shaft centered.
• Balancing is needed for suction pressure variations.
• Unequal forces act on the blades (suction and thrust), requiring force equalization.
• The balancing piston is positioned after the last stage of multiple-stage compressors.
• Force resultant = (Exit pressure – Inlet pressure) × Piston area.

Steam Trap

• Steam traps are devices for removing condensed liquids from gases or air.
• Key function: Removing condensed water from steam systems.
• Applications:
  • Steam turbine engines
  • Centrifugal compressors
  • Steam pipelines.

Types of Steam Traps

• Thermo Static Steam Trap
• Mechanical Steam Trap
• Pressure Thermo Trap

Steam Trap Operation

• A bi-metallic strip and a ball valve are crucial components.
• The ball valve moves freely due to the bi-metallic strip's thermal expansion and contraction.
• When cold, the valve is fully open, allowing air and steam to exit quickly.
• When steam enters the trap, the bi-metallic strip's force closes the valve tightly.
• Condensation (lower temperature) doesn't provide enough force to close the valve.
• Line pressure overcomes the bi-metallic strip's pull, opening the valve.
• The trap functions similarly to a non-return valve.