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Thermostatic Steam Traps. There are two basic designs for the thermostatic steam trap, a bimetallic and a balanced pressure design. Both designs use the difference in temperature between live steam and condensate or air to control the release of condensate and air from the steam line.
There are two varieties of thermodynamic steam trap: the thermodynamic disc and piston types. Thermodynamic steam traps operate by utilizing the difference in kinetic energy between high velocity steam (a gas) and slower moving condensate (a liquid).
Thermodynamic steam traps operate by utilizing the difference in kinetic energy between high velocity steam (a gas) and slower moving condensate (a liquid). For more information on disc traps, consult the following article: How Disc Traps Work: A Look at their Mechanism and Merits; Thermostatic Steam Traps
Thermodynamic steam traps have a unique operating principle which relies on the dynamics of water and flash steam. They are simple, robust and reliable and can operate up to very high temperatures and pressures. Their construction, use and benefits are detailed here.
Steam traps can be split into 3 varieties: thermodynamic, mechanical and thermostatic: Thermodynamic steam traps operate on the dynamics of steam vs condensate and the use of Bernoulli’s principle. This means that when condensate is released through the intake nozzle, the speed increases and a pressure drop occurs.
Thermostatic. Thermostatic traps use temperature to separate steam and condensate. When steam enters a thermostatic trap, the heat causes a capsule in the trap to expand, closing off the drain valve. As more cooled condensate fills the trap, its lower temperature causes the capsule to shrink again.
A commonly accepted practice is to use float & thermostatic (F&T) steam traps for low-pressure steam systems up to 30 PSIG, and thermodynamic steam traps for steam pressures over 30 PSIG.
Application type, system design and maintenance needs will influence the performance and selection of steam traps. Factors such as waterhammer, dirt, steam locking, group trapping, vacuum conditions and temperature control of processes are discussed in this tutorial.
Steam traps can be split into three main categories; Mechanical, Thermodynamic, and Thermostatic. Each type uses a different operating principle to remove condensate and non-condensable gases and keep steam in the system.
In all cases drain the jacket with float-thermostatic traps, as shown. Thermodynamic traps are possible alternatives but additional air venting will usually be required. When the paddle is heated, drain it with a float-thermostatic trap which has a steam lock release.