THERMODYNAMIC STEAM TRAP

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Operation

  • The thermodynamic steam trap is simple and robust in design. It operates by means of the dynamic effect of flash steam as it passes through the trap, as shown in figure (i).
  • On start-up, incoming steam raises the disc, & cool condensate & air are immediately discharged from the inner ring under the disc. & out through peripheral outlets.
  • Hot condensate passing through the trap drops in pressure and releases high velocity flash steam. This high velocity causes a low pressure under the disc drawing it down towards its seat, figure (ii).
  • At the same time, the flash steam pressure builds up above the disc forcing it down against incoming condensate until it seats on the inner and outer rings. At this point then steam is trapped in the upper chamber above the disc, figure (iii). The pressures above and below the disc are now equal however the surface area is greater above the disc.
  • Eventually the steam above the disc condenses and the higher condensate pressure raises the disc and the cycle repeats, figure (iv)

Advantages.

  • Works across all pressure ranges.
  • Small, light and high capacity.
  • Simple to maintain.
  • Can be used on superheated and saturated steam

Disadvantages.

  • Do not work on low differential pressures.