Sterlco Midsize - Manual (Page 8)

Page 8 Portable Hot Oil Temperature Control Units
• Heat exchanger options of 3.9 sq. ft. (0.3627 sq. m) and 6.7 sq. ft.
(0.6231 sq. m)
• Remote controller
• Lexan cover
• Optional operating voltages of 208/3/60, 230/3/60, 575/3/60,
380/3/50, and 415/3/50
1-6 Feature Descriptions
Immersion Heaters
The fluid is heated by the specially designed three-phase low watt density electrical
immersion heater, and regulated by the controller. The standard heater has a steel sheath for
low watt density and good heat transfer.
These models can be supplied with 6, 12, 18, 24 kW low watt density immersion heaters,
depending upon the heating needs of the process. The 18 and 24 kW models are built to
provide full or partial heat as required by the process and determined by the controller, to
provide more precise control.
Heater Tank
The portable hot oil temperature control unit features a single pass heater tank. The tank is
designed to maintain an optimum balance of fluid velocity versus watt density, and
turbulence for excellent heat transfer, and minimal pressure drop. The high fluid velocity will
greatly prolong the life of the heater and fluid.
Pump
The pump is a mechanical seal, positive displacement pump. It features a nearly maintenance
free design, and was selected after extensive testing to provide superior performance,
flexibility and low maintenance. It is well suited for use with a variety of commercially
available heat transfer fluids. The pump has only two internal moving parts, and a specially
designed seal to give years of trouble free service, even at high temperatures. The only
routine maintenance required is the monthly greasing and occasional head space adjustment;
see Section 6-2 on Page 35 for more information.
The pump is capable of running in either direction. Thus, the pump reverse feature can be
used to draw fluids back from the process. It is not necessary to install a service air line to
purge the lines before changing molds. Since the pump is capable of achieving extremely
high pressures, it is necessary to regulate the pressure through use of a regulating by-pass line
(Ful-Flo valve). Because the pump is a positive displacement pump, it will supply the process
with rated flow at or below the rated pressure.
The flow is constant until the pressure reaches the rated pressure. The pressure however is a
function of frictional losses through the process that it is attached to. Systems with large
process connections, ports, and piping will operate at low pressures. While systems with
small process connections, ports, and piping will operate at higher pressures. Once the
pressure requirements exceed the rated pressure, the fulflow valve will open and bypass the
necessary fluid to prevent high pressures.