STEAM TRAPS

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STEAM TRAPS
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GROUP MEMBERS

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

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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

• 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
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Disc type steam trap
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Impulse steam trap
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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

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

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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

• 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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• 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
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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

• 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
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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

• 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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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
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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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• 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 traps
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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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• 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
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The end