Immersion Heaters
Screw Plug Heaters
  Flange Heaters
  Over-The-Side Heaters
  Indirect Heaters
  Pipe Insert Heaters
  Circulation Heaters
Tubular Heaters
Finned Tubular Heaters
CalRod® Heaters
Mould Heaters
Duct Heaters
Tank Heaters
Cartridge Heaters
Band Heaters
Strip Heaters
Radiant Heaters
Temperature Controls
Thermocouples & RTD’S
Relays
Drum Heaters
Silicone Rubber Heaters
Technical Data
   
   

Screw Plug Heaters are constructed by brazing or welding elements into a hex pipe thread. These are intended for direct immersion into fluids and gases. The heater is to be installed via a threaded port in the tank or vessel. Screw plug heaters are available in a variety of pipe thread sizes and materials. The heating elements are offered in a number of materials suited to a variety of fluid heating applications. Terminal housings are available for indoor, outdoor (weatherproof NEMA 4) and hazardous (NEMA 7) environments. Many options are available including thermostats, high limit and process thermocouples or RTD sensors. Since we are a made to order company, we can offer a large selection of sizes and configurations which are not listed below. Please contact us for assistance with your application.


STANDARD PLUG SIZES & MATERIALS

     
 
NPT Sizes
British Sizes- BSP, BSPP
Materials
1”, 1 ¼”, 1 ½”, 2”, 2 ½”

1”, 1 ¼”, 1 ½”, 2”, 2 ½”


Brass, Steel, Stainless Steel
 
     


COMMON SHEATH MATERIALS

     
 
SHEATH MATERIAL
Copper
Steel

Stainless Steel
Incoloy 800®

Inconel 600®


APPLICATION WATT DENSITY
Watt.in²
Potable water 40-80
Fuel Oils
Hydraulic Oils
20-25
12-25
De-Ionized, R-O, Process Water,
Mild Acids
40-80
12-25
Water, Mild Alkaline Solutions, Air
And Gases Maximum Sheath
Temperature 1400ºF
10-125
Water, Very Alkaline Solutions,
High Temperature Air And Gases
Maximum Sheath Temperature
1500ºF
10-50
 
     


BUILT IN THREMOSTAT OPTIONS

     
 
Power Ratings

Up to 240 volts, 25-amp single pole, single throw (SPST)

Up to 240 volts, 25-amp double pole, single throw (DPST)

Up to 600 volts, 15-amp triple pole, single throw (TPST)
 
     
     
 
Temperature Ratings
-16 to 40°C (0-100°F)
10 to 10°C (50-250°F)
70 to 280°C (160-540°F)
160 to 370°C (320-700°F)
 
     


BUILT IN SENSOR OPTIONS

     
 
Sensors

"K" calibration thermocouple for high limit sheath protection and fluid sensing and temperature control.

"J" calibration thermocouple for high limit sheath protection and fluid sensing and temperature control.

100 Ohm RTD Sensor for fluid sensing and temperature control.
 
     

 


TERMINAL HOUSINGS AND CONSTRUCTIONS

1” NPT Screw Plug Heater Constructions

 
   
General Purpose Housings
No Thermostat
  General Purpose Housings
Buil In Thermostat

 
   
NEMA 4/NEMA 7 Housings
No Thermostat
  NEMA 4/NEMA 7 Housings
Buil In Thermostat SPST

 

1 1/4” NPT Screw Plug Heater Constructions


 
   
General Purpose Housings
No Thermostat
Single Element Design
  General Purpose Housings
Buil In Thermostat
Dual Element Design

 
   
NEMA 4/NEMA 7 Housings
No Thermostat
  NEMA 4/NEMA 7 Housings
Buil In Thermostat SPST

 

2” NPT Screw Plug Heater Constructions
(2 Elements, Single Phase)


 
   
General Purpose Housings
No Thermostat
  General Purpose Housings
Buil In Thermostat

 
   
NEMA 4/NEMA 7 Housings
No Thermostat
  NEMA 4/NEMA 7 Housings
Buil In Thermostat SPST

 

2” NPT Screw Plug Heater Constructions
(3 Elements, 1 or 3 Phase)


 
   
General Purpose Housings
No Thermostat
  General Purpose Housings
Buil In Thermostat

 
   
NEMA 4/NEMA 7 Housings
No Thermostat
  NEMA 4/NEMA 7 Housings
Buil In Thermostat SPST

 

2 1/2” NPT Screw Plug Heater Constructions
(3 Elements, 1 or 3 Phase)



 
   
General Purpose Housings
No Thermostat
  General Purpose Housings
Buil In Thermostat

 
   
NEMA 4/NEMA 7 Housings
No Thermostat
  NEMA 4/NEMA 7 Housings
Buil In Thermostat SPST

 
   
NEMA 4/NEMA 7 Housings
Buil In Thermostat 480/600 VAC TPST