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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

STEAM TRAPS

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

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steam traps3
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

2- to remove the non condensables

3-to prevent the discharge of steam

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applications
Applications

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.

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float type steam trap
Float type steam trap

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disc type steam trap
Disc type steam trap

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impulse steam trap
Impulse steam trap

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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

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

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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

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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.

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continue
Continue
  • 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

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float and thermostatic steam trap
Float and thermostatic steam trap

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inverted bucket trap
Inverted bucket trap

Constuction

  • 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.

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working
Working
  • 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.

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inverted bucket type steam trap
Inverted bucket type steam trap

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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

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liquid expansion thermostatic 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.

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working24
Working
  • 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.

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liquid expansion thermostatic trap
Liquid expansion thermostatic trap

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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.

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continue28
Continue
  • 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.

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balanced pressure thermostatic traps29
Balanced pressure thermostatic traps

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thermodynamic 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

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continue31
Continue
  • 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.

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thermodynamics steam traps
Thermodynamics steam traps

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the end
The end

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