Thermostatic | Steam Traps | Watson McDaniel

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Thermostatic

Thermostatic Traps

They are extremely energy efficient and excellent at discharging air allowing steam to enter the system quickly during system startup. Models are available in Stainless and alloy steel for Drip, Tracing, and medium size Process applications. Pressures up to 650 psig.

Superior air venting capability and extremely energy efficient
Single model operates over the entire pressure range in contrast to (F&Ts & IBs)
Considerably Smaller in size than F&Ts & IB traps of similar capacities
Self-draining to prevent freezing (unlike F&Ts and IB traps)

Product Models	Material	Characteristics
WT1000	Stainless Steel body (Seal-welded Body)	The WT1000 is specifically intended for Drip and Tracing Applications.
WT2000	Stainless Steel body (Seal-welded Body)	The WT2000 is substantially larger in capacity than the WT1000. It can be used for Batch Type Process Applications as well as for Drip and Tracing. Also used as an Air Vent; Model AV2000.
WT3000	Stainless Steel body (4-Bolt Cover)	The WT3000 Has an identical capacity to the WT2000; commonly used for Process Applications but can also be used for Drip and Tracing Applications if a repairable design is desired.
WT4000	Stainless Steel body (4-Bolt Cover)	The WT4000 Has substantially higher capacity than the WT3000; used for larger Process Applications.
WT2500	Cast Iron body	The WT2500 is an economical alternative to the WT3000 and is identical in capacity; however, its limited to 250 PSIG. It is likewise fully-repairable and can be used where cast iron is acceptable.
WT5000	Stainless Steel body (Temperature Adjustable)	It is fully-repairable and intended for Steam Tracing Applications. Its unique feature is a temperature-adjustable Bi-Metal element which allows for precise control of condensate discharge temperature (temperature adjustment can be made in the field). This is a desirable feature for Tracing Applications, so that condensate discharge temperature can be controlled to suit a particular application

Tracing Application for Thermostatic Traps

Tracing Applications refers to using steam to indirectly elevate the temperature of a product or process by using tubing or some type of jacketing device filled with steam. In a typical steam tracing application, stainless steel or copper tubing is filled with steam and is coiled or wrapped around the outside of a pipe or tank containing material that requires heating. The steam inside the tubing transfers its heat to the material in the pipe or tank; to stop it from freezing or to lower its viscosity to allow it to flow more easily. A steam trap is required for tracing to remove the condensate and air from the system. The most common trap choice for tracing applications is the Thermostatic type. Depending on the particular tracing application, it is often desirable to have some amount of condensate backup in the tubing.

Steam Tracing Applications:		Primary Trap Choice	Special Notes
Typical Service:	Some condensate back-up preferable	• Thermostatic	Thermostatic traps are suitable for the majority of steam tracing applications; for critical steam tracing applications, where no back-up of condensate can be tolerated, thermodynamic traps should be used.
Critical Service:	No back-up of condensate permitted	• Thermodynamic

Tracing Vertical Pipeline

Tubing can be wrapped around the piping with a steam trap installed at the low point to allow condensate to freely drain by gravity. Partial back-up of condensate using thermostatic trap.

Bi-Metal Steam Trap with Adjustable

Discharge Temperature (WT5000) For applications where overheating of product fluids in a pipeline may be a concern, an Adjustable Bi-Metal Steam Trap, such as the WT5000 (shown), should be considered. The discharge temperature of the condensate can be manually adjusted to control the amount of condensate back-up in the tracing tubing. This technique can be used to control the temperature of the product in the pipeline.

Drip Leg in a Steam Main

Steam traps are drained through a drip leg and are spaced apart every couple hundred feet. A properly sized drip leg will have a diameter equal to the steam main pipe size up to 4”. Improperly sized pipe diameter will prevent proper drainage of the condensate. Strainers are recommended prior to the steam trap as debris or pipe scale may enter the steam trap causing premature failures.

Process Application for Thermostatic Trap

Jacketed Kettle

As the name implies, Jacketed Kettles have a Jacket of Steam surrounding the outside of a Kettle. They are commonly used in the food and beverage industry for indirect heating of the contents in the kettle. This application demonstrates the use of the WT3003 Thermostatic Steam trap. Along with high condensate capacity handling and superior air handling capability, this trap can also operate at higher pressures. An advantage they have over F&T traps is that a single trap model operates over the entire pressure range making them easier to apply and maintain. It is typically recommended to install a thermostatic trap approximately 2 feet from process outlet piping to accommodate some back-up of condensate due to sub-cooling.

Outdoor Storage Tank (Batch Process)

When heating Storage tanks, the heat exchanger may be placed inside the tank. This may be simpler and less expensive than using a pump to circulate the product thru an external heat exchanger. Shown is a WT4000 Series thermostatic process trap removing the condensate. If a small amount of sub-cooled condensate is backed up, it will not adversely affect the process.

Plating Tank (Batch Process)

Typical Applications for Thermostatic Steam Traps With steam trap positioned above condensate collection point using the Steam Lock Release option (SLR).

Thermostatic Trap

The bellows type thermostatic traps contains a fluid-filled thermal element (bellows). The operation of the bellows follows the steam saturation curve, always discharging condensate a few degrees cooler than the steam temperature. As long as steam is present, the valve will remain closed. Only when subcooled condensate or air is present will the valve open.

Sub-Cool: The sub-cooling of condensate prior to discharge can have certain beneficial effects. In the majority of tracing applications, the sub-cooling of condensate is highly desirable because of the additional energy that is extracted from the Hot condensate. If the trap did not sub-cool condensate, this energy would be wasted. In Batch style process applications such as jacketed kettles, plating tanks and heating of outdoor storage tanks, the sub-cooling of condensate is generally not a factor to consider since the amount of condensate back-up requires less than 1% of the heat transfer surface area and is therefore considered negligible.

Air

When air, which is cooler than steam, is present, the bellows is retracted and the seat is open, allowing large quantities of air to be discharged.

Condensate

When condensate, which is cooler than steam, is present, the bellows retracts and the seat opens, allowing condensate to be discharged.

Steam

When steam reaches the trap, the bellows expands, closing off the seat and preventing the steam from escaping.

WT1000/WT1500

STERILIZERS, DRIP, TRACING: The WT1000 is seal welded and therefore Non-Repairable. It is NOT available with a strainer. This product CANNOT be welded in-line or failure of the Thermal Element may occur. The WT1500 is a repairable version with increased capacity; ideal for sterilizers. These trap is small, light, and has excellent air handling capabilities. The discharging of air on start-up allows steam to enter the system more quickly.

Model	Size	Type	Orifice Size	Max PMO (psig)
WT1000-12-N	1/2"	NPT	n/a	300
WT1000-13-N	3/4"	NPT	n/a	300
WT1500-12-N	1/2"	NPT	n/a	125

WT2000

DRIP, TRACING, PROCESS: The WT2000* thermostatic steam trap is used for drip, tracing, and process applications. Their compact size, all stainless steel construction,excellent air & handling capabilities, and the ability to operate over a wide & pressure range make them a good choice for most applications. They can also be used as an air vent on heat exchangers. Thermostatic traps are far superior to bucket traps and thermodynamic traps in their ability to remove air from the system. The discharging of air on start up allows steam to enter the system more quickly.

* WT2001 refer to 3/16" orifice size and should be used on all drip and tracing applications,WT2003 refer to 5/16" orifice size.

Model	Size	Type	Orifice Size	Max PMO (psig)
WT2001-13-N	3/4"	NPT	3/16"	650
WT2001-12-N	1/2"	NPT	3/16"	650
WT2003-12-N	1/2"	NPT	5/16"	650
WT2003-13-N	3/4"	NPT	5/16"	650

WT3000 Repairable

PROCESS: The WT3000* thermostatic steam trap is used for industrial process applications. Their compact size, all stainless steel construction, excellent air handling capability and wide operating pressure range make them a great choice for most process applications. Thermostatic traps are far superior to bucket traps and thermodynamic disc traps in their ability to remove air from the system.

* WT3001 refer to 3/16" orifice size, WT3003 refer to 5/16" orifice size.

Model	Size	Type	Orifice Size	Options	Max PMO (psig)
WT3001-12-N	1/2"	NPT	3/16"		650
WT3001-13-N	3/4"	NPT	3/16"		650
WT3001S-12-N	1/2"	NPT	3/16"	Strainer	650
WT3001S-13-N	3/4"	NPT	3/16"	Strainer	650
WT3003-12-N	1/2"	NPT	5/16"		650
WT3003-13-N	3/4"	NPT	5/16"		650
WT3003S-13-N	3/4"	NPT	5/16"	Strainer	650
WT3003S-12-N	1/2"	NPT	5/16"	Strainer	650
WT3001-13-SW	3/4"	Socket Weld	3/16"		650
WT3001-12-SW	1/2"	Socket Weld	3/16"		650
WT3001S-13-SW	3/4"	Socket Weld	3/16"	Strainer	650
WT3001S-12-SW	1/2"	Socket Weld	3/16"	Strainer	650
WT3003-12-SW	1/2"	Socket Weld	5/16"		650
WT3003-13-SW	3/4"	Socket Weld	5/16"		650
WT3003S-12-SW	1/2"	Socket Weld	5/16"	Strainer	650
WT3003S-13-SW	3/4"	Socket Weld	5/16"	Strainer	650
WT3001S-12-F150	1/2"	150# FLG	3/16"	Strainer	650
WT3001S-13-F150	3/4"	150# FLG	3/16"	Strainer	650
WT3001-12-F150	1/2"	150# FLG	3/16"		650
WT3001-13-F150	3/4"	150# FLG	3/16"		650
WT3003-13-F150	3/4"	150# FLG	5/16"		650
WT3003S-13-F150	3/4"	150# FLG	5/16"	Strainer	650
WT3003S-12-F150	1/2"	150# FLG	5/16"	Strainer	650
WT3003-12-F150	1/2"	150# FLG	5/16"		650
WT3001-12-F300	1/2"	300# FLG	3/16"		650
WT3001-13-F300	3/4"	300# FLG	3/16"		650
WT3001S-12-F300	1/2"	300# FLG	3/16"	Strainer	650
WT3001S-13-F300	3/4"	300# FLG	3/16"	Strainer	650
WT3003S-13-F300	3/4"	300# FLG	5/16"	Strainer	650
WT3003-12-F300	1/2"	300# FLG	5/16"		650
WT3003S-12-F300	1/2"	300# FLG	5/16"	Strainer	650
WT3003-13-F300	3/4"	300# FLG	5/16"		650

WT4000 Repairable High Capacity

PROCESS: The WT4000* thermostatic steam trap is used for industrial process applications. Their compact size, all stainless steel construction,excellent air handling capability and wide operating pressure range make them a great choice for most process applications. Thermostatic traps are far superior to bucket traps and thermodynamic disc traps in their ability to remove air from the system.

* WT4001 refer to 5/16" orifice size, WT4003 refer to 7/16" orifice size.

Model	Size	Type	Orifice Size	Options	Max PMO (psig)
WT4001-14-N	1"	NPT	5/16"		300
WT4001S-13-N	3/4"	NPT	5/16"	Strainer	300
WT4001S-14-N	1"	NPT	5/16"	Strainer	300
WT4003-13-N	3/4"	NPT	7/16"		300
WT4003-14-N	1"	NPT	7/16"		300
WT4003S-13-N	3/4"	NPT	7/16"	Strainer	300
WT4003S-14-N	1"	NPT	7/16"	Strainer	300
WT4001-13-SW	3/4"	Socket Weld	5/16"		300
WT4001-14-SW	1"	Socket Weld	5/16"		300
WT4001S-13-SW	3/4"	Socket Weld	5/16"	Strainer	300
WT4001S-14-SW	1"	Socket Weld	5/16"	Strainer	300
WT4003-13-SW	3/4"	Socket Weld	7/16"		300
WT4003-14-SW	1"	Socket Weld	7/16"		300
WT4003S-13-SW	3/4"	Socket Weld	7/16"	Strainer	300
WT4003S-14-SW	1"	Socket Weld	7/16"	Strainer	300
WT4001-13-F150	3/4"	150# FLG	5/16"		300
WT4001-14-F150	1"	150# FLG	5/16"		300
WT4001S-13-F150	3/4"	150# FLG	5/16"	Strainer	300
WT4001S-14-F150	1"	150# FLG	5/16"	Strainer	300
WT4003-13-F150	3/4"	150# FLG	7/16"		300
WT4003-14-F150	1"	150# FLG	7/16"		300
WT4003S-13-F150	3/4"	150# FLG	7/16"	Strainer	300
WT4003S-14-F150	1"	150# FLG	7/16"	Strainer	300
WT4001-13-F300	3/4"	300# FLG	5/16"		300
WT4001-14-F300	1"	300# FLG	5/16"		300
WT4001S-13-F300	3/4"	300# FLG	5/16"	Strainer	300
WT4001S-14-F300	1"	300# FLG	5/16"	Strainer	300
WT4003-13-F300	3/4"	300# FLG	7/16"		300
WT4003-14-F300	1"	300# FLG	7/16"		300
WT4003S-13-F300	3/4"	300# FLG	7/16"	Strainer	300
WT4003S-14-F300	1"	300# FLG	7/16"	Strainer	300

WT2500 Repairable Cast Iron

DRIP, TRACING, PROCESS: The WT2500* thermostatic steam trap is used for drip, tracing and process applications. Their compact size,excellent air handling capability and wide operating pressure range make them a great choice for most applications. Thermostatic traps are far superior to bucket traps and thermodynamic disc traps in their ability to remove air from the system.

* WT2501 refer to 3/16" orifice size, WT2503 refer to 5/16" orifice size.

Model	Size	Type	Orifice Size	Max PMO (psig)
WT2501-13-N	3/4"	NPT	3/16"	250
WT2503-12-N	1/2"	NPT	5/16"	250
WT2501-12-N	1/2"	NPT	3/16"	250
WT2503-13-N	3/4"	NPT	5/16"	250

WT5000 Repairable

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.

Model	Size	Type	Orifice Size	Max PMO (psig)
WT5000-11-N	3/8"	NPT	n/a	650
WT5000-12-N	1/2"	NPT	n/a	650
WT5000-13-N	3/4"	NPT	n/a	650
WT5000-14-N	1"	NPT	n/a	650
WT5000-11-SW	3/8"	Socket Weld	n/a	650
WT5000-12-SW	1/2"	Socket Weld	n/a	650
WT5000-13-SW	3/4"	Socket Weld	n/a	650
WT5000-14-SW	1"	Socket Weld	n/a	650

BM300 Repairable Carbon Steel

DRIP: The BM300 is a Medium Capacity Thermostatic Bimetal steam trap which is ideal as a drip trap on superheated steam mains and steam supply lines, as well as saturated steam lines and steam tracing applications. Bimetal traps subcool condensate before opening, making them extremely energy efficient and highly resistant to steam loss.

Model	Size	Type	Orifice Size	Options	Max PMO (psig)
BM300S-12-N	1/2"	NPT	n/a	Strainer	300
BM300S-13-N	3/4"	NPT	n/a	Strainer	300
BM300S-12-SW	1/2"	Socket Weld	n/a	Strainer	300
BM300S-13-SW	3/4"	Socket Weld	n/a	Strainer	300
BM300S-14-SW	1"	Socket Weld	n/a	Strainer	300
BM300S-12-BW	1/2"	Butt Weld	n/a	Strainer	300
BM300S-13-BW	3/4"	Butt Weld	n/a	Strainer	300
BM300S-14-BW	1"	Butt Weld	n/a	Strainer	300
BM300S-12-F150	1/2"	150# FLG	n/a	Strainer	300
BM300S-13-F150	3/4"	150# FLG	n/a	Strainer	300
BM300S-14-F150	1"	150# FLG	n/a	Strainer	300
BM300S-12-F300	1/2"	300# FLG	n/a	Strainer	300
BM300S-13-F300	3/4"	300# FLG	n/a	Strainer	300
BM300S-14-F300	1"	300# FLG	n/a	Strainer	300

Universal UT450

DRIP, TRACER, PROCESS:The UT450 Thermostatic Steam Trap Module can be used anywhere. Trap module mounts to any 2-bolt Universal Connector.

Model	Size	Type	Orifice Size	Options	Max PMO (psig)	Max Capacity @ Max PMO (lb/h)
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Temperature

Inlet Pressure
Discharge Pressure
Min. Δ Pressure

Condensate Load
Fill Head
Motive Source