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Steam traps

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steam traps

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Steam traps

  1. 1. STEAM TRAPS SHIVAJI CHOUDHURY
  2. 2. Steam trap  Steam traps are automatic valves the function of which is to allow the condensate to pass while preventing the passage of steam.  Steam traps are also expected to pass air and other non-condensible gases without the loss of steam.
  3. 3. Definition of a Steam Trap  “self-contained valve which automatically drains the condensate from a steam containing enclosure while remaining tight to live steam, or if necessary, allowing steam to flow at a controlled or adjusted rate. Most steam traps will also pass non- condensible gases while remaining tight to live steam.”
  4. 4. Function of steam traps  • Discharges condensate  • Prevents or limits the discharge of steam.  • Automatically opens and closes (or throttles) the flow: 1. — At the saturated steam temperature 2. — Below the saturated steam temperature (also called subcooled condensate)  • Discharges liquid for freeze protection  • Drains non-condensible gases, such as air and CO2 during: 1. — Start-up 2. — Normal running conditions
  5. 5. Basic types of steam traps:  • Thermostatic traps. 1. Bimetalic 2. bellow  • Thermodynamic traps. 1. Disc 2. piston  • Mechanical traps. 1. Float 2. orifice
  6. 6. • Thermostatic traps.  Traps that are actuated by temperature- sensitive devices.  They attempt to sense the difference between steam and condensate by their temperature.  Therefore, this type of trap can discriminate between steam and cooler non-condensible gases.  Most thermostatic traps are either actuated by a bimetallic thermostat or use bellows filled with vaporizing liquid.
  7. 7. • Thermodynamic traps.  Traps that are actuated by principles of thermodynamics and fluid dynamics.  This type uses flash or live steam to close the valve. Disc traps, piston traps, and lever traps fall into this category.
  8. 8. • Mechanical traps.  Traps that are actuated by a float, which responds to changes in condensate level.  Float and thermostatic traps, inverted bucket traps, and open bucket traps are mechanical trap.
  9. 9. Disc trap  Disc traps utilize the heat energy in hot condensate and the kinetic energy in steam to open and close the valve disc.  They sense the difference between liquid, and gas or vapor.
  10. 10. Piston trap  Piston (or impulse) traps utilize the heat energy in hot condensate, and the kinetic energy in steam to open and close a valve.  Like disc traps, they sense the difference between a liquid, and gas or vapor.
  11. 11. Float trap  The closed float trap is one of the oldest type of steam traps on the market, but it is still in widespread use. The opening and closing of the valve is caused by changes of the condensate level within the trap shell.  When the trap is empty, the weight of the float closes the valve. As condensate enters the trap, the float rises and opens the valve, allowing condensate to be discharged.
  12. 12. Bimetalic traps  Bimetallic steam traps utilize the sensible heat in the condensate in conjunction  with line pressure to open and close a valve mechanism.
  13. 13. Bellow traps  Bellows traps are thermostatic traps that respond to changes in the temperature and pressure of the steam supply to open and close a valve.  The valve actuator is a capsule or bellows filled with a vaporizing liquid, and because it has both a fixed and a free moving end, it opens or closes the valve in response to internal pressure changes.
  14. 14. Orifice traps  Fixed orifice traps or drainers are seldom used because of their limitations.  This device consists of one or more successive orifices. Where two or more orifices are used, condensate passes through a number of successive chambers where flashing occurs.  This creates a restricting or choking effect and allows the use of larger and less dirt-sensitive orifices for a given condensate capacity. In some designs, these “fixed” orifices are actually adjustable valves.
  15. 15. STEAM TRAP APPLICATIONS industrial steam trapping applications can be divided into two major classifications:  protection  process service.
  16. 16. Protection Service  Steam line drip. Drainage of the condensate that forms in the pipes delivering steam from a boiler to a specific point of use.  This helps prevent damaging water hammer and promotes the delivery of dryer steam to plant equipment.
  17. 17. Process Service  Drainage of the condensate that normally forms when steam is used to heat liquids, gases, or solids in any industrial process.
  18. 18. Steam trap installation
  19. 19. Infrared thermography monitoring  Steam Traps Leakage from a steam trap.
  20. 20. INDUSTRY STANDARDS  • ANSI/FCI-85-1: Standard for Production Testing of Steam Traps  • ANSI/FCI-69-1: Pressure Rating Standard for Steam Traps  • ANSI/FCI-65-3: Operating Principles and Standard for Determining Steam Trap Capacity Ratings  • ANSI/ASME PTC-39.1: Condensate Removal Devices for Steam Systems
  21. 21. Coating and Paints for traps  Heat resistant aluminium paints IS 13183 Gr 1 ( for 400-600 deg C ) IS 13183 Gr 2 ( for 200-400 deg C )
  22. 22. Thanking you

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