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Thermodynamic Steam Traps

Steam has two components: 1] the latent heat useful in process for Heat transfer, and 2] the Sensible heat in the form of condensate having only the heat content not useful in process, rather hindering Heat transfer and causing damage to piping equipment due to its presence. Hence, there is need to remove condensate and trapped steam. This is done by Steam trap.

The Thermodynamic Trap works on the principle of difference in the velocities of Steam and Condensate. Used Mainly on Drip lines of the main steam distribution line, uses condensate pressure to open the trap and discharge the condensate and then the Flash steam formed due to the high flash steam velocity & accumulation of flash steam over disc, Device close and trap the live steam when it appears.

Thermodynamic Steam Trap are compact and lightweight and discharge condensate as and when it is formed.

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Operating Animation
  • Available in Sizes: 15, 20 and 25mm
  • End connections: Threaded to BSP/BSPT/NPT, SW and BW, as well as Flanged to #150/300/600/900/1500. e
  • Pressure Ranges of 30 bar [UTD21], 55 bar TD55 [Single and Three orifices], 100Bar [UTD 62] AND 250 Bar [UTD120]
  • MOC: AISI 420./ 743 Gr. CA40[UTD21/55] / ASTM A217 Gr. WC6[UTD62] / ASTMA 182 Gr. F22 cl3. [UTD120]
  • Max. Operating temperature: 425 Deg. C[UTD55] 550 Deg. C. [UTD62/120]

All the Traps, except UTD120, can be supplied with Isotubs and Blow down cocks.

  1. UTD 51R

    UKL Thermodynamic steam trap in Forged construction as per ASTM A105, with Integral Flanges and Replaceable Seat arrangement.

    Size 
    (NB)    		Max. Op. Pr./ Temp ( kg/cm2 / oC)End connectionsOptional / Additional information
    15 to 2051 / 425Flanged #150 / #300 ( Integral )
    Screwed- BSP / BSPT / NPT
    Socket Weld    		IBR / Non-IBR

  2. UTD 55 / UTD 55F

    UKL Thermodynamic Steam Trap in cast stainless steel construction as per ASTM A743 Gr.CA40,

    Size  (NB)          Max. Op. Pr / Temp (kg/cm2 / oC) End connections Optional /Additional information
    15 to 2555 / 454

    Screwed-BSP/BSPT/NPT

    Socket weld

    Flanged #150/#300(weld-on)

    With blow-down cock

    IBR/Non-IBR

  3. UTD 62

    UKL Thermodynamic Steam Trap in alloy steel construction as per ASTM A217 Gr WC6 (with Replaceable Seat)

    Size  (NB)          Max. Op. Pr / Temp (kg/cm2 / oC) End connections Optional /Additional information
    15 to 2562 / 525

    Screwed-BSP/BSPT/NPT

    Socket weld

    Butt weld

    Flanged #150/#300/#600

    IBR / Non-IBR

    Flanged #900

  4. UTD 120

    UKL Thermodynamic Steam Trap in alloy steel construction as per ASTM A182 Gr F22 (with Replaceable Seat)

    Size  (NB)          Max. Op. Pr / Temp (kg/cm2 / oC) End connections Optional /Additional information
    15 to 25255 / 550

    Socket weld

    Butt weld

    IBR / Non-IBR

    Flanged #900 / #1500

As the name suggests, a Steam Trap is a device which allows Condensate to pass through it, while trapping live Steam. Steam Trap is used to drain out the condensate in steam network, formed due to heat loss or heat transfer, without live steam loss.
A steam trap does the following multiple work:
1) It Allows venting of air or non-condensable gases present in steam network(especially during start-up)
2) It Traps live steam
3) It Discharges the condensate(formed due to condensation)
It is required at one or numerous locations to,
1) Avoid water hammer in steam pipes and other equipments
2) Improve the heat transfer capabilities of equipments
3) Avoid excessive corrosion and pitting
There are 3(three) types of steam traps
1) Thermodynamic(disc) type:
Operating principle :- It works of Bernoulli’s principle (Kinetic energy/velocity)
2) Thermostatic(bellow) type
Operating principle :- It works of thermal(temperature) principle
3) Mechanical(Float and bucket) type
Operating principle :- It works of Buoyancy principle
FOS or Safety factor is related to the discharge capacity of steam trap. Every steam trap is designed to meet a predefined discharge capacity at corresponding differential pressure. But if actual rate of condensation is higher at some plant locations due to conditions of start-up or similar conditions, we must consider FOS or safety factor to meet these extra demands of condensate discharging.
Insulation of steam traps is not recommended with few exceptions However, it depends on the operating principle of steam trap. Please note, insulation means Thermal insulation
1) Thermodynamic Type : Insulating should be limited to Ice & Rain fall from top cover side only
2) Thermostatic Type : Not recommended at all
3) Mechanical Type : Float & Bucket type are mechanical traps. Not recommended for this type too

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