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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 engineering-resource.com
GROUP MEMBERS • 06-CHEM-63 • 06-CHEM-62 • 06-CHEM-90 • 06-CHEM-100 engineering-resource.com
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 engineering-resource.com
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. engineering-resource.com
Float type steam trap engineering-resource.com
Disc type steam trap engineering-resource.com
Impulse steam trap engineering-resource.com
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 engineering-resource.com
Types of steam traps • Some common types of steam traps are • Mechanical steam traps • Thermostatic traps • Thermodynamic traps engineering-resource.com
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 engineering-resource.com
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. engineering-resource.com
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 engineering-resource.com
Float and thermostatic steam trap engineering-resource.com
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. engineering-resource.com
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. engineering-resource.com
Inverted bucket type steam trap engineering-resource.com
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 engineering-resource.com
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. engineering-resource.com
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. engineering-resource.com
Liquid expansion thermostatic trap engineering-resource.com
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. engineering-resource.com
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. engineering-resource.com
Balanced pressure thermostatic traps engineering-resource.com
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 engineering-resource.com
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. engineering-resource.com
Thermodynamics steam traps engineering-resource.com
The end engineering-resource.com
