PACKAGED SYSTEMS - Large Tank Heaters
Large Tank Heaters Application & Equipment Selection
Large Tank Heaters Applications
A major portion of the heating operations in large storage tanks can be performed
at night during off peak power rates. Frequently, only small amounts of heat are
required to sustain temperature levels in the tank during the daytime. Using Chromalox
packaged control centers, large tank heating systems can be operated with little
or no manual attention. The needed heat can be applied economically and automatically
by using strategically located thermostats to monitor tank temperatures and energize
the heaters. The heating operation may be fully automated by using time clocks to
program the start and stop of both off peak and daytime heating functions.
In addition to operating convenience, electric heating systems require very little
upkeep and are practically maintenance free. The result is substantially reduced
operating costs over alternative heating methods.
OCE Open Coil Elements — Heavy gauge resistance
wire coils are mounted into high density electrical ceramics. The ceramics are strung
on a continuous support bar to provide suffi cient rigidity to insert the
assembly into a 2 or 3" Schedule 40 NPS steel pipe. Pipes are installed into
tanks or vessels by the end user. NEMA 4 terminal enclosure kits are available for
field installation.

WARNING — In hazardous areas, pipe surfaces could achieve
temperatures high enough to cause auto-ignition of hazardous materials present.
Consult Article 500 of the National Electrical Code for further information on the
maximum allowable temperatures for a specifi c application.
Large Tank Heaters Equipment
Chromalox offers a number of cost effective solutions to the challenge of heating
materials in large storage tanks. In addition to fl anged immersion heaters,
over-the-side heaters, cir culation heaters, steam boilers, heat transfer systems
and heat tracing cables which are described in other sections of this catalog, Chromalox
offers three uniquely designed heating systems for large storage tanks. These specialty
products can be installed in above or below ground tanks made of steel, concrete
or Fiberglas ® . Equipment selection ranges from simple OCE Pipe
Insert Heaters to larger RSTO Unitary Immersion Heaters to the FXTH Flexible Tank
Heater.
FXTH Flexible Tank Heaters — are particularly
useful when the storage tank to be heated is under ground or the tank ends are inaccessible
for installation of more conventional heaters. FXTH heaters can be installed through
the normal manhole opening of many large tanks without requiring any modifi
cations to the tank itself.

Packaged Systems
Large Tank Heaters Application & Equipment Selection
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RSTO & RST — Unitary Immersion Heaters
Metal sheath or open coil elements are inserted into an assembly of 3" Schedule
40 NPS steel pipes. The pipes are welded into an adapter box for convenient fi
eld welding of the entire assembly to the header of a steel tank. The heaters are
self contained with built-in controls mounted in a weather proof electrical enclosure.
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Flange Heaters
- LTFX Large Tank Flange Heaters allow tank heating elements to be changed without
drain ing the tank. They provids low watt density heeating over a large surface
area while providing precise temperature control.
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SHO Suction Heaters
Heating of viscous materials, in large storage tanks, to pumping temperatures.
Maintaining an entire tank of viscous fl uids such as fuel oil or asphalt
at pumping temperatures is very costly. In many applications it is not practical
or economical because the tanks are located underground or are not insulated.
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Optional Heaters
RSTO and RST Unitary Immersion Heaters are available with explosion
resistant electrical enclosures and/or adapter flanges in place of the adapter box.
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WARNING — In hazardous areas, pipe surfaces could achieve
temperatures high enough to cause auto-ignition of hazardous materials present.
Consult Article 500 of the National Electrical Code for further information on the
maximum allowable temperatures for a specifi c application.
Large Tank Heaters — Selection Guidelines
Download the Large Tank Heater Selection Guidelines