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Screw Plug Immersion Heaters
ts1870b.jpg (18707 bytes) Screw Plug Immersion Heaters consist of tubular elements welded or brazed into a threaded screw plug which can then be inserted into a threaded opening in a tank wall or through a mating full or half coupling.
 

Screw Plug
NPT

*Minimum
Hole Diameter

“A”

“B”

“C”

 Thermowell Bulb Size

in

mm

in

mm

in

mm

in

mm

in

mm

1"

1-1/8

29

7/8

22

1-1/4

32

1-3/8

35

1/4

6.4

1-1/4"

1-3/8

35

1-5/16

24

1-5/16

33

1-3/4

44

1/4

6.4

2"

2 -1/4

57

1-1/16

27

1-9/16

40

2-1/2

64

3/8

9.5

2-1/2"

2-1/2

64

1-5/16

33

2-1/16

52

3

76

3/8

9.5
Typical Applications

Steel Sheath—Fluid heat transfer media, tar, high to low viscosity petroleum oils, asphalt, wax, paraffin, degreasing solvents, alcohol, molten salt, and other solutions not corrosive to steel sheath. Sheath temperatures to 750°F (399°C) dependant on application.
Standard Sizes and Ratings of Steel Sheath Heaters

Incoloy® Sheath—Weak chemical solutions, oils, tar, caustic soda, detergent, alkaline solutions, molten salts, demineralized, deionized or pure water (sheath passivation is recommended), and other aqueous solutions not corrosive to Incoloy® sheath. Air, gas mixtures and super-heated steam. Sheath temperatures to 1600°F (871°C) dependant on application.
Standard Sizes and Ratings of Incoloy Sheath Heaters

 

  

Copper Sheath—Process water, water with very weak chemical solutions, demineralized, deionized or pure water, hot water storage for washrooms, showers, cleaning and rinsing parts, for freeze protection of cooling towers and sprinkler systems and other aqueous solutions not corrosive to copper sheath. Sheath temperatures to 350°F (177°C) dependant on application.
Standard Sizes and Ratings of Copper Sheath Heaters

316 Stainless Steel Sheath—Weak chemical solutions, deionized or pure water (sheath passivation is recommended), and other aqueous solutions not corrosive to 316 Stainless Steel sheath. Air, gas mixtures and super-heated steam. Sheath temperatures to 1200°F (649°C) dependant on application.
Standard Sizes and Ratings of 316 Stainless Steel Sheath Heaters

 

 

h043.jpg (13926 bytes) Self-Contained Immersion Heater

This immersion heater is specifically designed for commercial dishwashers and sterilizing equipment. However, due to the unique construction characteristics of these heaters, they are readily adaptable for use in other water heating applications.

 

 
h015.jpg (5694 bytes) Hot Water Tank Heaters

 

Selecting the proper Screw Plug Heater

Tempco Screw Plug Immersion Heaters will provide long life and dependable trouble free service—provided the sheath materials, watt densities and operating temperatures are properly matched for the medium being heated.

Observe the following guidelines:

  1. Match your process to the most suitable heater alloy sheath material.
  2. Do not exceed the maximum allowable heater watt density (w/in2) and recommended operating temperature for the material being heated.
  3. Select the proper terminal enclosure to protect the heater wiring and provide safety to personnel and equipment.