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FT-C Vertical Electric Thermal Fluid Heater Manual 12 2013 ISSUE 1
Page 34
3
3.4
FOR SYSTEMS EQUIPPED WITH INERT BLANKETS
1. Follow the instructions listed under
Section 3.3.1, Filling Procedure
.
2. Pay close attention to notes and warnings.
3. Inspect the system to be sure all valves are open and all drains are closed.
4. Open all high point air vents.
5. Do not pressurise the system with nitrogen at this point.
6. Inspect the liquid level switch and be sure the switch is functioning properly.
7. Begin filling the system.
8. Fill the system until the liquid level switch indicates there is oil in the expansion tank.
9. Pressurise the system slightly with nitrogen. Leave the high point vent connections open, as the
nitrogen should be isolated from the vents by the oil in the system. The pressure required in the
system at this point is only 0.1 - 0.2 barg. If too much pressure is applied, the nitrogen will
bubble through the oil and vent to atmosphere. If this happens, reduce the pressure.
10. Continue filling the system. If the liquid level switch is made, be sure to observe the high point
vents as oil is now entering the elevated portion of the pipe work. As oil reaches the vent, close
it. After all vents have been closed, and you believe the system to be full, stop filling. Start the
circulating pump as described under “Cold Circulation”
Section 3.6.2
Leave the fill equipment
connected as cleaning the strainer may create the need for more oil in the system.
11. The final nitrogen pressure is determined by measuring the difference between the D.A. Tank
inlet and the highest point in the system. Divide that number by 2.31 (this will indicate the
nitrogen pressure (in psi) the system should be set for). Adjustment can be made via the
regulator mounted on top of the D.A. tank.
Note:
Tanks are non-code as a standard. Non-code tanks cannot be pressurised over 0.5 barg. Tanks built to
BS EN13445:2009 are available upon request.
11) As oil reaches a vent, close it. After all vents have been closed, and you believe the system to
be full, stop filling. Start the circulating pump as described in
Section 3.6.2 "Initial Start-Up:
Cold Circulation"
of this manual. Leave the fill equipment connected as cleaning the strainer
may create the need for more oil in the system.
12) Verify to see that the liquid level switch operates freely. To confirm operation of the liquid level
switch, manually trip the liquid level switch. Unit should shut down; pump will stop.
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