Sterling 682.88107.00 Feature Descriptions, Immersion Heaters, Heater Tank, Pump, Ful-Flo Valve

2-5 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, or 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 Upright 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 5-3 on Page 40 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 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 bypass 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 pressure requirements exceed the rated pressure, the Ful-Flow valve will open and bypass the necessary fluid to prevent high pressures.

Ful-Flo Valve

A regulating bypass line featuring a Ful-Flo valve is standard in all units. This is a safety device to prevent excessive pressure in the event that the delivery line is obstructed. Each Ful-Flo valve is factory preset to limit system pressure as specified by the customer. It must not be tampered with in any way.

In the event of an obstruction in the line, the Ful-Flo valve will open and divert fluid from the delivery TO PROCESS line to the return FROM PROCESS line. A constant flow of fluid is maintained through the heater tank to prevent damage to the heating elements and fluid.

Upright Portable Hot Oil TCUs Chapter 2: Functional Description 12