Tubular heating elements, the most versatile of all types, are
used for practically the entire range of electric resistance heating
applications. A cut-a-way view showing the components of the elements
is shown below:
metal sheath material and the proper size resistance wire for the
heating element are carefully chosen and verified by computer calculations
to insure the longest service life possible. The nickel/chromium
resistor wire is then fusion welded to a terminal pin to assure
a positive connection. It is centered in the metal sheath and insulated
with high quality magnesium oxide,(MgO). The MgO is tightly compacted
around the coil and acts as an electrical insulator. The material
rapidly conducts the heat from the coiled resistor to the metal
sheath and puts the heat where it is required.
Choice of Sheath Material
A selection of sheath material is available to meet an unlimited
variety of applications. Standard sheath materials are: Incoloy®,
Types 304 and 316 stainless steel, copper, nickel and titanium.
Tubular elements generally have a threaded terminal for electrical
connection at each end. Other types of terminal connections are
Variety of Mounting
Methods Elements can be supplied with threaded fittings for mounting
through walls of tanks, ovens, etc. Compression threaded fittings
are also available for easy field installation. Rings, clips, brackets,
and washers can also be attached to elements for mounting purposes.
Nickel Chromium Resistance Wire
80% nickel, 20% chromium alloy resistance wire is the heart of the
tubular element. This wire must meet strict and internationally
Magnesium oxide insulation is carefully selected to give the best
transfer of heat from resistance wire to element sheath. This allows
the resistor wire to operate at the lowest possible temperature.
The MgO must meet rigid specifications
To put heat where it is needed, tubular elements can be formed to
fit most requirements. We can form tubular elements to your exact
Tubular heaters are designed for long life and will outlast other
tubular elements in a given application. Proper application assures
long life.Consult with one of our applications engineers for assistance.
Virtually any cold zone can be manufactured, provided cold zone
parameters are not violated.