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Movable immersion heaters

Movable electrical immersion heaters are designed for heating liquids in open tanks with a low or variable level such as degreasing baths and surface treatment

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The design is based on customer process conditions : fluid to heat (type and properties), in/out temperature, pressure, heat exchange conditions (stagnant or flowing), and environment conditions (ATEX or not, onshore or offshore, etc.).

Movable electrical immersion heater are adapted to process requirements and the dimensional restrictions of equipment and can be used in vertical or horizontal (bottom) heating.

Reliability and robustness are key drivers for our engineers.

Product overview

  • Power according to specification
  • Voltage up to 690V
  • Screw plug in steel, brass or stainless steel
  • Dimension adapted to process equipment

Advantages

  • Large range of materials and options according to customer process and application
  • Benefit from CETAL’s 50 years of experience as designer and manufacturer!
  • The end-to-end control of the design and production chain allows us to deliver a product which suits your process perfectly

Operating conditions

  • Normal (non-ATEX)
  • Hazardous areas (ATEX/IECEx) and NEC 505
  • Extreme environments: – 60°C to + 80 °C
  • Fluid/solid: from – 270 °C (3 K) to 1000 °C
  • Onshore / Offshore environment
  • Salt atmosphere

Liquids, gas and solids

Water

  • Stagnant water, max load 8 -12 W/cm², material: copper, 321, 316L
  • Circulating water, max load 10 -16 W/cm², material: copper, 316L, inc 800, inc 825
  • Boric water, max load 8 W/cm², material: 316L
  • Boiler water, max load 8 -16W/cm², material: 316L, inc 800, inc 825
  • Chlorated water, max load 6 W/cm², material: inc 825
  • Sea water, max load 3,5 -6 W/cm², material: inc 825, inc600
  • Demineralized water / deionized / distilled / Softened,max load 4 -6 W/cm², material: 316L, inc 800, inc 825
  • Domestic hot water, max load 4 -8 W/cm², material: copper, 316L, inc 825
  • Caustic water (2%, 10%, <30%, 70%), max load 2,3-7W/cm², material: 316L, inc 825, inc 600

Oil

  • Fuel oil pre-heating, light fuel oil, C fuel oil, max load 1 – 2 W/cm², material: 321, 316L
  • Heavy fuel, max load 0.5 – 3.5 W/cm² acc to grade, material: 316L
  • Gasoline, kerosene, max load 3.0 – 3.5 W/cm², material: 316L
  • Machine oil SAE 10, 30, 40 & 50, max load 2,0 – 3.5 W/cm², material: 316L
  • Mineral oil , max load 0.5 – 3.5 W/cm² acc to temp, material: 321, 316L
  • Lube oil, max load 2,3 W/cm², material: 321, 316L

Acid & corrosive fluid

  • Acetic acid, max load 6W/cm², material: 316L, inc 825
  • Boric acid, max load 6W/cm², material: inc 825
  • Chloric, hydrofluoric, nitric, sulphuric acide, max load 1.5W/cm², material: teflon coat
  • Boric acid, max load 6W/cm², material: inc 825
  • Alkaline bath, max load 6W/cm², material: 321 (no corrosive compound), 316L
  • Phosphate bath, max load 4W/cm², material: 316L, inc 825

Glycol

  • Ethylene glycol, propylene glycol, 4 to 8 W/cm² acc. to concentration, material: 321, 316L

Others

  • Asphalt, tar, and other heavy or highly viscous compounds, max load 0.5 – 1.5W/cm², material: 316L
  • Milk, max load 0.3W/cm², material: 316L

Technical description

Heating elements

The watt density, tube diameter and the tube sheath are chosen to optimize the reliability and robustness (corrosion, temperature) of CETAL equipments.

Technologies

  • Tubular heating element (most fo the cases)
  • Heating rods into sleeve

Tube diameter & material

  • Tube diameter: 6.5 / 8.5 / 10 / 13.5 / 16 mm
  • Tube material:
    • Stainless steel: AISI 321 (1.4541) / AISI 316L (1.4404) / AISI 309 (1.4828)
    • Others: Incoloy 800 (1.4876) / Incoloy 825 (2.4858) / Inconel 600 (2.4816)
    • Titanium
  • Specific coating: Teflon™ (PTFE) / Halar
  • Tube type: sealed tube

Manufacturing

  • 100% of the components come from our high-quality suppliers from Europe
  • 100% manufacturing in CETAL factory

  1. Connection terminals
  2. Tube
  3. Insulation : magnesia oxyde (Mg O), to secure optimized heat transfer and electrical insulation.
  4. Resistance wire: Made of Nickel Chrome 80/20, it is the active part of the heating element (Joule effect)
  5. Cold length
  6. Sealing material: Keeps out external moisture. Different types (silicon, resins, cement) are used depending on the industrialapplication, the external medium and temperature.
  7. Output insulation: Made of steatite ou corundum, it provides dielectric insulation (creepage distance, distance in the air).

Flange / sealed casing / Heating element assembly

  • Heating elements welded to the fastening flange or to a sealed casing welded to the stainless steel rising bath.

Connection box

  • Enclosure away from the evaporation area

Temperature control & switching devices

  • Temperature sensors (thermostat, limiter, thermocouple or PT100) in the medium (process control) or on theheating element (safety control), on the flange or in the connecting box.

Electrical

  • Voltage: VAC or VCC
  • Cabling according to main voltage VAC/VCC 1PH + N or 3PH
  • Power : a few Watt to several Megawatts

Manufacturing tests

Electrical tests

  • Power test by cold resistance measurement. Allowed tolerance: -5% and +10% of the nominal resistance value.
  • Insulationtest, direct voltage 500 V, mini cold value is > 100 Megohms
  • Dielectric test, (2U + 1000 V)  x 1,2 during 1 second
  • The stray current and the hot dielectric rigidity can be measured on a sample at operating temperature (on request).
  • 100% of the heating elements are tested before shipment (Final control)

Mechanical tests

  • Visual inspection
  • X-ray test (if required)
  • Liquid penetrant test
  • Pressure control test

Dimensional test

  • Critical dimension are tested
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