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PRODUCT DESCRIPTION
NPH circulation heaters feature all-welded construction of the steel shroud and flanges, hydrostatically pressure-tested ports, heavy-duty metal-sheathed heating elements of Incoloy or steel, galvanized or carbon steel containment pipe, NEMA1 terminal housings, bulb & capillary thermostats or solid-state controls, plus up to a 150-lb. forged steel flange with bolt construction connecting the terminal housing and containment vessel.
Circulation or Recirculation Heaters Specifications Circulation Heaters
Recirculation Heaters Wiring Diagrams How to Extend the Life of Your Circulation Heater Circulation Heaters Features:
High
efficiency heat transfer
Pressure
ratings to 600 lbs
ANSI
Standard NPT or ANSI Class 150 connections
Heaters
could be screw plug or flanged
Stainless
steel construction with Canadian Vessel Registration
Various
housing options available NEMA 4, 4X, explosion proof
Suitable
for steam, oils, chemicals, gases, corrosive solutions
Optional Features
Weather Proof Insulated Shroud
All Stainless Steel Construction
ASME Section 8 Construction on Vessel
High Pressure Construction
High Temperature Ceramic Fiber Insulation
Passivation on all Wetted Surfaces
Other Sheath Materials: Carpenter 20, Model 400,
Inconel 600, Hastelloy, and Titanium
Applications Factors
Heater selection is influenced by the following parameters:
The Heated Medium, Viscosity, Specific Heat, Density
and Corrosive Properties
The Presence of
Contaminants in the Medium
The Corrosion
Resistant Properties of the Heated Medium
The Sheath Watt
Density of the Heating Elements (the watts/in�) and the Flow Rate of the
heated moedium
The Vessel
Design and Materials of Construction
Times, Temperature, and Pressure
Pressure Vessels
All standard pressure vessel
(tank) materials are rated to 150 lb. and made from:
Carbon
Steel
304/316
Stainless Steel
All catalog pressure vessels (tank) are steel unless otherwise noted.
COMMON SHEATH MATERIALS
Sheath Material Application Watt Density
Watts/in�
Copper Potable water 40-80
Steel Fuel Oils, Hydraulic Oils 20-25 &12-25
Stainless De-Ionized, R-O, Process Water 40-80
Steel Mild Acids 12-25
Incoloy 800 Water, Mild Alkaline Solutions, Air 10-125
and Gases, Maximum Sheath
Temperature 1400�F
Inconel 600 Water, Very Alkaline Solutions, 10-50
High Temperature Air And Gases
Maximum Sheath Temperature
1500�F
Titanium Sea Water, Very Alkaline 10-45
Solutions, Some Acid Solutions
Circulation Heaters Specifications / Design Capabilities:
Voltages. . . . . . . . . . . . . . . .120 to 600 Volts
Inlet/outlet. . . . . . . . . . . . . .N PT 1 /2" to 21 /2
Flanges 2" to 14" 16" to 24" on request
Heater. . . . . . . . . . . . . . . . .NPT or flange mount as required
Wattage's. . . . . . . . . . . . . . .Varied from 150 watts to 1 Megawatt
Sheath Materials. . . . . . . . . . Titanium, Monel, Incoloy, 316/304 Stainless,
Steel Copper, Carbon Steel
Max Temperatures. . . . . . . . . Incoloy 1600 degrees F (870 C)
304 / 316 Stainless Steel 1200 degrees F (650)
Steel 750 degrees F (400 C)Copper 350 degree F (175 C)
Pressure Rating. . . . . . . . . . . 150, 300 or 600 Ibs
Flange Materials. . . . . . . . . . .Standard Carbon Steel or 316/304 Stainless
Gaskets. . . . . . . . . . . . . . . . Rubber, Asbestos Free, or Spiral wound
Terminal Enclosures. . . . . . . . General Purpose (NEMA 1 ),
Moisture Resistant (NEMA 4), Corrosion
Resistant (NEMA 4X), Explosion Resistant (NEMA 7),
Explosion Moisture Resistant (NEMA 7/4)
Temperature control. . . . . . . .Thermocouple, RTD, or Thermostat
High Limit. . . . . . . . . . . . . . . High Limit Thermocouple, Hi Limit Tstat,
Certification. . . . . . . . . . . . . ASME, CRR, Heater & Vessel certification
How To Order Circulation, Recirculation or Closed Loop Industrial Heaters
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