The
component tubular heaters depending on the
mounting provisions and configurations are
suitable for use in solids, liquids, air
as well as gases. These heaters provide
the most design versatility of any electric
heater construction. Tubular heaters because
of their compacted MgO insulation construction
can reach fairly high sheath temperatures,
however the successful application of these
heaters are primarily dependent on the end
use.
A major advantage
of Tubular heaters is the ability to form
into custom shapes. Bend in radius as small
as twice the tube diameter depending on
the tube material, configuration and application.
Solids heating can be accomplished by clamping
of Tubular heaters to the heated object
surface. Good surface contact is required
in order to prevent localized overheating.
Due to round cross section of the heater,
it is always advisable to put a groove into
the solid and the heater is pressed into
the groove. Heaters can be configured with
a flat surface pressed into the heater surface
certain shapes limitations are applicable.
Tubular heaters are often cast into Aluminum
for broad surface coverage and uniform heating
application requirements.Liquid heating
requires the use of leak tight mountings/fittings
provisions for direct immersion. Threaded
mounting fittings, flanges, brackets and
custom mounting attachments are used for
this purpose and often include custom element
shapes. Heater sheath corrosion resistance
and watt density (the amount of wattage
spread out over the available heater surface
area = Watts/Sq. Inch.) are important factors
in designing and applying the proper heater.
Air and gas heating Tubular heaters designs
typically incorporate low watt density constructions
or finned designs. As I most heater applications
the watt density is critical to ensure heater
temperatures are maintained within limits
of the product capability. All finned tubular
and duct heaters are suitable for air applications.
Depending on the conditions some bushing,
flanged and circulation heaters may also
be used for heating air.
In all cases due to normal high temperature
attainable on any metal-sheathed heater
avoid contact with combustible surface or
materials.
As
with any electrically heated product, the
proper application of heater and temperature
control is the most important factor in
optimum performance, efficiency and longevity
i.e. longer life. No two systems are alike
It is extremely important that attention
has been given to the total product or system
design as well as operating environment.
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