Tubular Heating Elements

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Tubular Heating Elements

The basis of many heaters are tubular heating elements. Tubular elements are manufactured out of a metal tube (1) in with in the centre a heating coil (3). This heating coil is insulated from the tube with high condensed magnesium oxide (2). The heating coil is point welded to the connection pins (4). These pins are sticking out of the tube and have at the end a weld connection or thread for connecting the electrical wires. The element is sealed with liquid sealing paste (5) moisture tight (mostly with polyurethane or silicone), end at both end provided with ceramic or plastic plugs (6). Depending on the resistance of the heating coil and the length and diameter of the element many variations in power can be realised.

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The way of sealing of the element is extremely important. They must meet our high standards, so that our elements always have the highest possible insulation resistance1.

Depending on the resistance of the heating coil and the length of the element, many variations can be achieved. The elements are available in various materials, power, voltages, and dimensions.

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  • Material: AISI304(L), AISI309(L), AISI316(L), AISI321(L), AISI316Ti, Incoloy800, Incoloy825, Inconel600, Hasteloy, SMO254, Cupper, Cupper-Nickel, etc.
  • Diameter: ø6.5, ø8.0, ø8.5, ø10.2, ø16mm
  • Shape: The tubular elements are annealed after which they are highly flexible and can be bend in almost any shape. A frequently used form is the U-shape (hair pin), W-vom, spiral shape, 3d shapes, etc.
  • Watt density: Depending on the medium to be heated, the element material and flow rate along the element, a particular watt density (W/cm2) is allowed. Standard values are:
    - Oil: 0.5-3W/cm2
    - dirty water: 3-5 W/cm2
    - water: up to approx. 10W/cm2 (in special cases even higher).
     Enon gespiraliseerd buiselement         Enon beribde buiselementenEnon tubular heating element

1 The insulation resistance is the resistance between a conductor and earth for electrical installations and electrical equipment. The better (higher) the insulation resistance, the smaller the leakage current can be. The resistance of the insulation can be measured with a Megger.


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