There are three main types of steam traps, each with its own specific applications:
- Mechanical Steam Traps:
- Float Type: Uses a float that rises and falls with the condensate level to open and close a valve. Ideal for applications where condensate load is relatively constant, such as in heat exchangers and process equipment.
- Inverted Bucket Type: Uses an inverted bucket that rises and falls with the condensate level. Suitable for high-pressure applications and where condensate load varies.
- Venturi Orifice Type: Uses the venturi effect to maintain a continuous flow of condensate while minimizing steam loss.
- Thermodynamic Steam Traps:
- Disc Type: Operates based on the difference in kinetic energy between steam and condensate. Best for high-pressure applications and steam mains.
- Piston Type: Similar to disc type but uses a piston instead. Suitable for applications with varying condensate loads.
- Thermostatic Steam Traps:
- Bimetallic Type: Uses bimetallic strips that bend with temperature changes to open and close the valve. Ideal for applications where condensate needs to be discharged at a lower temperature.
- Balanced Pressure Type: Uses a bellows filled with a volatile liquid that expands and contracts with temperature changes. Suitable for tracing applications and where precise temperature control is needed.
Venturi Orifice Steam Traps
Design and Operation:
- No Moving Parts: Venturi steam traps operate without any moving parts, making them highly reliable and low-maintenance.
- Continuous Condensate Removal: They continuously remove condensate from the steam system by utilizing the venturi effect, which creates a pressure differential that allows condensate to pass while preventing steam from escaping.
- Density Difference: The operation is based on the difference in density between steam and condensate. Condensate, being denser, flows through the venturi orifice at a slower rate, effectively blocking steam from passing through.
Advantages:
- Durability: With no moving parts, venturi steam traps are less prone to wear and tear, reducing maintenance needs.
- Energy Efficiency: They minimize steam loss, making them energy-efficient and cost-effective.
- High Pressure Suitability: Ideal for high-pressure applications where consistent condensate removal is crucial.
Disadvantages:
- Fixed Capacity: They are designed for specific condensate loads and may not handle large variations effectively.
- Potential for Blockage: Although less common, they can become blocked by debris, necessitating the use of strainers.
Venturi steam traps are particularly useful in applications where the condensate load is relatively constant and high reliability is required, such as in steam distribution systems and high-pressure steam lines.
Each type of steam trap has its own advantages and is chosen based on the specific requirements of the application, such as pressure, temperature, and condensate load.