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WT5000 Thermostatic Steam Trap

TRACING: The WT5000 Series Bi-metal Steam Trap is used in steam tracing applications (process lines, instrumentation and winterization,general steam jacketing) and small process applications where accurate control of condensate discharge temperature is required to utilize the sensible heat of the condensate.

ModelSizeTypeMax PMO (psig)Max Capacity @ Max PMO (lb/hr)Options
WT5000-12-SW1/2"Socket Weld650
WT5000-11-SW3/8"Socket Weld650
WT5000-13-SW3/4"Socket Weld650
WT5000-14-SW1"Socket Weld650
Product Overview
TRACING: The WT5000 is specifically designed for steam tracing applications where accurate and adjustable control of condensate discharge temperature is required. Can be used where a temperature sensitive medium is being transferred in piping system or held in a storage vessel and standard steam tracing methods  may not be adequate to maintain specific product temperatures. Having the ability to adjust the condensate discharge temperature would allow for  accurate temperature control of the product being traced. The significant feature of the WT5000 is that the condensate discharge temperature is easily field adjustable.
• Excellent for various steam tracing and small process applications using the sensible heat of condensate
• Field adjustable bimetal element allows precise control of condensate discharge temperature
• Internal screen and seat/plug design help prevent pipe scale and debris from accumulating on seating surfaces to provide trouble-free operation
• In-line repairable
How It Works
Bi-metallic plates of dissimilar metals respond to steam temperature variations, whereby the metals are relaxed at relatively cool conditions (such as start-up)  and the trap is open for the discharge of condensate. As temperature nears the preset subcool temperature below saturation, the metals react and expand,  closing the trap and preventing the loss of live steam. External field-adjustability of the bi-metal element allows precise control of the condensate discharge temperature.

The condensate temperature can be field adjusted as follows:
To INCREASE  the temperature, turn the adjuster screw: COUNTERCLOCKWISE
To DECREASE the temperature, turn the adjuster screw: CLOCKWISE

Note: The lower the set temperature, the more condensate will back-up in front of the trap inlet connection. Therefore, consideration should be given to providing adequate piping to accommodate any such back-up.
Selection / Sizing / Capacities
Available in 3/8” through 1” NPT and socket weld connections. Select this model for steam systems with maximum working pressure of 650 PSIG.


1) Capacities in chart are based on discharging condensate to atmospheric pressure (0 PSIG).
2) Initial Opening Temperature = T is the temperature at which the trap just begins to open. A negligable amount of condensate flow takes place at this temperature. It is adjustable between 120°F and 390°F.
3) Initial Opening Temperature must be at least 27 degrees below the saturated steam temperature to prevent possible steam loss.
4) When the condensate cools below the initial opening temperature, the Bi-metal mechanism opens further, increasing trap capacity. Trap capacity can be adjusted up to the max value given in the chart.
5) For instructions on setting the trap discharge temperature and capacity, refer to the Watson McDaniel Installation and Maintenance Guide.
6) Example: A WT5000 trap with 125 PSIG Steam Inlet Pressure can be set to an Initial Opening Temperature between 120°F and 326°F. It can pass up to 413 lbs/hr when the temperature of the condensate is 80°F below the initial opening temperature (T–80°F).

T= Initial Operning Temperature of the Trap
can be set from 120°F to 390°F

Dimension and Weights
Installation and Maintenance
Trap can be installed in any orientation. The body is made from stainless steel and is fully repairable while the steam trap remains in-line. If the trap fails,  remove the cover and replace the internal working components. Repair kit includes bimetallic element (including valve stem and plug), seat and gasket.
Sample Specification
The steam trap shall be of thermostatic type with stainless steel body, seat, valve plug and bimetallic element. Bimetal element shall be externally adjustable for  control of condensate discharge temperature. Trap must be in-line repairable with a replaceable bimetal element, valve plug and seat.