steam traps engineering-resource.com. group members 06-chem-63 06-chem-62 06-chem-90 06-chem-100...

STEAM TRAPS

engineering-resource.com

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

2- to remove the non condensables

3-to prevent the discharge of steam


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.


Float type steam trap


http://www.google.com.pk/imgres?imgurl=http://www.arivalve.com/steam_trap.jpg&imgrefurl=http://www.arivalve.com/steam_traps.htm&h=451&w=300&sz=24&tbnid=TWU2fxhA2P-6pM::&tbnh=127&tbnw=84&prev=/images%3Fq%3Dsteam%2Btraps%2Bimages&hl=en&usg=__W7RNTnFRXquS-upNOpn0xfRmGOU=&ei=sAQDSqKiH8uJkQXJxLzSBA&sa=X&oi=image_result&resnum=1&ct=image

Disc type steam trap


http://images.google.com.pk/imgres?imgurl=https://www.armstronginternational.com/en_US/product_solutions/steam_trapping_and_steam_tracing_equip/steam_traps/controlled_disc/images/SubCD1_full.jpg&imgrefurl=https://www.armstronginternational.com/steam-traps-disctrap&usg=__gMfrr0zFXQNtYpD_pc6Tq9TxUt8=&h=600&w=463&sz=47&hl=en&start=11&um=1&tbnid=HSBXpg8HKKFsIM:&tbnh=135&tbnw=104&prev=/images%3Fq%3Dsteam%2Btraps%2Bimages%26hl%3Den%26sa%3DN%26um%3D1

Impulse steam trap


http://images.google.com.pk/imgres?imgurl=http://www.spiraxsarco.com/images/resources/steam-engineering-tutorials/11/4/Fig_11_4_4.gif&imgrefurl=http://www.spiraxsarco.com/resources/steam-engineering-tutorials/steam-traps-and-steam-trapping/thermodynamic-steam-traps.asp&usg=__CjAvUgoMSoobZtMVO1_iKVyfYWU=&h=333&w=500&sz=22&hl=en&start=27&um=1&tbnid=599IkTThGbiDFM:&tbnh=87&tbnw=130&prev=/images%3Fq%3Dsteam%2Btraps%2Bimages%26ndsp%3D20%26hl%3Den%26sa%3DN%26start%3D20%26um%3D1

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

• Some common types of steam traps are

Mechanical steam trapsThermostatic trapsThermodynamic 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

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.


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


Float and thermostatic steam 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.


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.


Inverted bucket type steam trap


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.


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.


Liquid expansion thermostatic trap


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.


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.


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


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.


Thermodynamics steam traps


The end


steam traps engineering-resource.com. group members 06-chem-63 06-chem-62 06-chem-90 06-chem-100...

Documents

thermostatic steam trap

applications steam traps

thermodynamics steam

discharge of steam

flow of steam

common types of steam

impulse steam trap

type of thermostatic