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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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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 trapsThermostatic trapsThermodynamic 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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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
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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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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
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The end
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