What is the working principle of steam trap?
The main principle behind the operation of thermodynamic steam traps is Bernoulli’s principle. Thermodynamic Traps are the most widely used steam traps for removing condensate from main lines largely due to their small size, wide pressure range, one moving part, and resistance to water hammer and corrosion.
What are the two functions of a steam trap?
Most steam traps are nothing more than a type of automatic valve that opens and closes or modulates automatically. The steam trap has three main functions: to discharge the condensate; to not release steam; and the discharge of air in addition to other non-condensable gasses.
What is steam trap back pressure?
The ‘back pressure’ is the pressure just downstream of the steam trap. In other words, back pressure is the outlet or secondary pressure of the trap. The difference between a trap’s inlet (primary) pressure and back pressure is called the ‘differential pressure’.
How do you calculate steam trap capacity?
A sizing factor is added in the condensate capacity to determine the correct steam trap capacity selection for effective operation.
- Typical Sizing Factors.
- Pressure drop across the unit heater = 5 psig.
- Rise in condensate piping after the steam trap (distance of six feet) =
- P2 = 5 psig + 3 psig.
Where are float traps used?
They are commonly used for steam mains drainage or high temperature tracing discharge. However, Free Float® traps are more energy efficient and durable in the same services, so typically disc traps are recommended as a second choice in those applications.
Why do we need steam trap?
The duty of a steam trap is to discharge condensate, air and other incondensable gases from a steam system while not permitting the escape of live steam. The need for steam traps, considerations surrounding their operation, basic modes of operation and relevant standards are all covered in this tutorial.