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Flanged Immersion Heaters

----Flange Immersion Heater.o.white.jpgFlanged immersion heaters are constructed of hairpin bent tubular heater elements brazed or welded into ANSI standard flanges or plate flanges of various shapes and sizes. ANSI flange heaters are typically used for large volume, high power and/or higher pressure applications. Plate flange heaters are typically custom designed for use in smaller pieces of equipment such as boilers and chillers.

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Typical Applications:

  • Process Air & Gases
  • Process Chemical Reactors
  • Boilers and Water Heating
  • Rinse Tank Heating
  • Parts Cleaning Solutions
  • Lube Oil & Fuel Oil Heating
  • Hydraulic and Heat Transfer Oils
  • Caustic Solution Heating
  • Plating & Finishing Chemicals
  • Water-Glycol Solution Heating
  • Freeze Protection & Winterizing

Application Guidelines

The goal is to optimize the heater configuration to ensure the longest life possible, while minimizing overall product and life cycle costs. The general temperature, sheath material and watt density guidelines below can aid in proper heater selection for some common liquids. Contact Durex for further assistance.

Liquid Max. Operating Temps °F (°C) pH Level and/or Concentration Recommended Sheath Material Typical Plug Material Max. Watt Density W/in2(W/cm2)
Clean, Potable Water
212 (100) Neutral (pH 6 to 8) Copper Brass 60-90 (9.5-14)
Process Water & Weak Solution 212 (100) pH 5 to 9; 2-3% Incoloy®, 304SS Steel or 304SS 48 (7.5)
Demineralized, Deionized Water 212 (100) Neutral 304SS or 316SS (passivated) 304SS or 316SS 60 (9.5)
Weak (Acidic) Solutions* 210 (100) Up to 5-6% Incoloy®, 316SS Steel 48 (7.5)
Mildly Corrosive (Acidic) Solutions* 180 (80) 5-15% Incoloy®, 316SS 304SS or 316SS 20-30 (3.5)
Severely Corrosive (Acidic) Solutions* 180 (80) >15% Incoloy®, titanium, Teflon® 304SS or other 15-16 (2.5)
Caustic Soda 10% 200 (100) pH 14; 10% Incoloy® Steel 20-23 (3.5)
Caustic Soda 50% 250 (120) pH 14; 50% Incoloy® Steel 16 (2.5)
Fuel Oil 1 & 2; Kerosene Lube Oil SAE 10 to 30 200-250 (95-120) - Steel Steel 20-23 (3.5)
Fuel Oil 4 & 5; Lube Oil SAE 40 to 50 200-250 (95-120) - Steel Steel 15-16 (2.5)
Fuel Oil 6 & Bunker C 160 (70) - Steel Steel 6-8 (1.2)
Hydraulic Oil 100 (40) - Steel Steel 15-16 (2.5)
Ethylene Glycol 300 (150) - Steel Steel 23-30 (3.5-4.5)
Glycerin 500 (260) - Incoloy® Steel 8-10 (1.5)
Molten Salt Bath 800 (425) - Steel, 321SS, Monel® Steel 23-30 (3.5-4.5)
Paraffin Wax 150 (65) - Steel or 304SS Steel 15-16 (2.5)
Molasses 100 (40) - 304SS or 316SS 304SS 4-5 (0.7)

* Sheath material and watt density dependent on type of acid, concentration, temperature, aeration, movement, etc.

  • Please note that the user accepts full responsibility for validating that a heater is suitable for a given liquid or gas heating application.
  • Ensure that heater elements are completely covered in liquid AT ALL TIMES. Failure to do so may cause the heater elements to operate in open air and fail prematurely, or worse, lead to ignition of flammable vapor mixtures, causing serious personal injury and equipment damage. Liquid level sensors are highly recommended.
  • Durex recommends the use of a thermostat or process controller as well as a high limit sensor and FM approved safety controller to prevent unexpected over temperature conditions.

Flange Immersion Heater Design Features

ANSI Class 150 3" to 14" flange sizes standard

  • Quick delivery
  • Power ratings from 1kW to 500kW

Class 300 to 2500 flanges and to 40" diameter available

  • Custom fit to application demands
  • Ensures proper pressure rating for your needs

Copper, steel, stainless steel, and Incoloy® and other heater sheaths available

  • Custom tailored to application requirements

Plate flanges designed to suit application

  • Pressurized or non-pressurized applications

Integral thermostats or thermocouples available

  • Allows integral control or temperature monitoring

Recompacted element bends

  • Provides longer life by ensuring insulation integrity

c-UL recognized elements to 600VAC available

  • Assures safe and reliable performance

Hazardous location rated terminal enclosures available

  • Compliance to strict safety standards for hazloc areas

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