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STEAM TRAPS. GROUP MEMBERS. 06-CHEM-63 06-CHEM-62 06-CHEM-90 06-CHEM-100. STEAM TRAPS. A steam trap is an automatic valve that allows the condensate to discharge but traps or prevent the flow of steam. There are three basic purposes of using steam trap 1- to remove the condensate

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steam traps


group members
  • 06-CHEM-63
  • 06-CHEM-62
  • 06-CHEM-90
  • 06-CHEM-100

steam traps3
  • A steam trap is an automatic valve that allows the condensate to discharge but traps or prevent the flow of steam.
  • There are three basic purposes of using steam trap

1- to remove the condensate

2- to remove the non condensables

3-to prevent the discharge of steam


Steam traps are used in all types of steam heated equipments like

1- evaporators,

2- reboilers,

3- steam jacketed vessels.

Steam condenses after giving its latent heat. This condensate must be removed continuously without allowing the steam to blow out.

float type steam trap
Float type steam trap

disc type steam trap
Disc type steam trap

impulse steam trap
Impulse steam trap

working principle
Working principle
  • It distinguishes between steam and the condensate on the basis of

1- Density difference

2- Temperature difference

3- Difference in the flow characteristics

types of steam traps
Types of steam traps
  • Some common types of steam traps are
  • Mechanical steam traps
  • Thermostatic traps
  • Thermodynamic traps

mechanical steam traps
Mechanical steam traps
  • This type of traps function on the basis of density difference.
  • Common types are

1-float and thermostatic traps

2-inverted bucket traps

float and thermostatic trap
Float and thermostatic trap

Construction & working

It Consists of

1- condensate chamber

2- float

3- valve for the discharge of condensate.

  • When the condensate flow into the chamber, the float rises and open up the valve connected to it.

  • Float and thermostatic trap is fitted with thermostatically regulated vent above the condensate level.
  • Its basic purpose is to remove the non condensables that are present in the steam.
  • Thermostatic vent remain open below the saturation temperature of steam

float and thermostatic steam trap
Float and thermostatic steam trap

inverted bucket trap
Inverted bucket trap


  • It has float of the shape of inverted cylinder or bucket open at the bottom.
  • The orifice in the condensate discharge passage has a valve seat which operates by the movement of lever attach to the bucket.

  • When there is no or little condensate in the trap. The bucket is kept floating by the entering steam.
  • As the condensate accumulate bucket sinks in the condensate.
  • The valve get opened and the condensate get discharged.

inverted bucket type steam trap
Inverted bucket type steam trap

thermostatic traps
Thermostatic traps
  • Types of thermostatic traps

Its two important types are

1- liquid expansion thermostatic trap

2- balanced pressure thermostatic trap

It also include bimettalic traps

liquid expansion thermostatic traps
  • Construction
  • It consist of closed metal cartridge. Filled with oil or suitable liquid.
  • Cartridge contains corrugations, the other end of which contains a valve.

  • The condensate collects in the traps, Liquid in the traps cool down and the Catridge contracts
  • The valve opens and the condensate discharge.
  • In the absence of condensate, cartridge comes in contact with the steam that is at a higher temperature than the cooled condensate.
  • The valve then get closed. And stops the flow of steam out of trap.

liquid expansion thermostatic trap
Liquid expansion thermostatic trap

balanced pressure thermostatic traps
Balanced pressure thermostatic traps
  • Construction & working
  • A type of thermostatic traps consists of a flexible bellows, filled with a suitable liquid, containing a valve at its end.
  • The valve is closed by the boiling of liquid, and the resultant pressure rise and the expansion of bellows.
  • As the condensate collects in the traps, it cools down and the temperature of the bellows also drops down.

  • Bellows contracts the valve get opened and the condensate is discharged.
  • When the steam enters the trap, it raises the temperature in the bellows, the bellows expands and the valve again get closed.

balanced pressure thermostatic traps29
Balanced pressure thermostatic traps

thermodynamic traps
  • Construction & working
  • It consist of coin sized flat disc on a flat seat that acts as a valve.
  • The disc covers the orifices for the condensate flow.
  • It has a single moving part (the disc), is rugged in construction and operates relatively smoothly

  • The collected condensate cool down, leave the disc and goes out through the orifice.
  • When the condensate is discharged, a high velocity steam creates a low pressure below the disc.
  • The disc settles down on the seat and closes the orifices.

thermodynamics steam traps
Thermodynamics steam traps

the end
The end