FULTON FT-0080C, Инструкция по установке, эксплуатации, обслуживанию и каталог запасных частей

Страница: 46 / 92

FT-C Vertical Electric Thermal Fluid Heater Manual 12 2013 ISSUE 1
Page 38
3
3.6.3
FILTERING THE SYSTEM
1. Initially, readings on the compound gauge will indicate zero or slightly positive pressure. During
the first few moments of flow, this reading will go towards vacuum, indicating that the strainer is
becoming plugged.
2. Typically, a reading of 0.1 barg or greater vacuum on the pump suction gauge indicates that the
strainer must be cleaned. The strainer screen should be back flushed or pulled, cleaned and
replaced.
3. In some cases, a positive pressure can be measured at the pump suction gauge (due to the use
of a nitrogen blanket or large positive head). This should be noted and if the reading decreases
by several inches or pressure, check the strainer to ensure it clean.
4. Strainers should be cleaned by means of compressed air. A rag will merely force the smaller
particles into the mesh of the strainer. It is recommended to place a lint free rag in the centre of
the strainer and blow air from the outside, trapping the debris in the rag.
5. Allow the pump to run again for several minutes and repeat the filtering process until pump
suction pressure remains steady after cleaning. The amount of time which must be allotted for
filtering varies with the system.
6. When the system is initially brought up to temperature, additional pipe scale and welding slag
will loosen and enter the fluid stream. This will be trapped in the strainer causing vacuum at the
pump suction. This procedure must be followed as necessary in the course of heater operation.
3.6.4
SYSTEM BOILOUT
1. Ensure adequate ventilation.
2. Check for correct fuel feed. All air must be eliminated from fuel lines, gas piping, preheaters,
etc. by approved methods.
3. Open all manual valves in the fuel oil supply line. Do not run the fuel pump dry or without fuel
lines connected to fuel source. Do not allow the fuel oil pump to pull a vacuum.
4. Check safeties.
5. Disable N2 blanket if equipped and open vent line on DA tank.
6. Set control switch to “Heat”. The burner will begin the call for heat if oil temperature is below
setpoint.
7. With burner firing and pump running, keep checking the gauges indicating pump and circuit
pressures. Make sure they remain stable.
8. In case of pressure fluctuations, stop the burner, but allow the pump to continue to circulate
fluid.
9. When pressures have stabilized, start burner again.
10. Continue in this manner up to the maximum operating temperature. Throughout the initial
warm-up, the expansion tank and its overflow pipe must be watched to detect the formation of
steam, indicating the presence of water. If this occurs, burner should be shut down.
Note: As the system is being boiled out, the piping must be checked for leaks as the temperature of the thermal
fluid is increased. If a leak is detected, refer to Thermal Fluids at Elevated Temperatures section in Installation
section of this manual.