Fulton Vertical Electric (FT-N) Thermal Fluid (hot oil) Heater - Manual (Page 104)

Fulton Thermal Corp.*Electric Thermal Fluid Heaters Manual* Version 2010-0423
Page 104
A system of interconnecting pipework in the thermal buffer tank section prevents the movement of any oil,
that has not cooled sufficiently, into the expansion section. This avoids contact of very high thermal fluid
temperature with oxygen contained in the atmosphere.
Sizing the Tank for the System:
Expansion tank capacity is the total volume of the tank. It is necessary to have some air space available
at the tope of the tank to avoid spillage or overflow.
At initial fill (for system volume calculations) the deaerator and cold seal sections must be filled
completely, and the expansion section must be filled to a level of 4” to “make” the low level switch.
The volume between the initial fill level and the safe “full” level is the amount available for expansion. That
volume is used to decide which tank is suitable for the system expansion.
Model
Capacity
(Gallons)
Initial Fill
(Gallons)
Available for
Expansion
(Gallons)
Max System
Volume
FT-100-L 35 9 25 100
FT-200-L 52 25 46 184
FT-1000-L 264 80 232 1000
FT-1500-L 397 90 380 1400
FT-2000-L 528 145 444 1700
FT-3000-L 793 215 717 2600
FT-5000-L 1310 300 1168 4600
Example: A System contains 175 gallons, including the heater, but not the tank. You select the FT-200-L,
so you add 25 gallons to 175. You must look up the expansion rate for the thermal fluid. (Assume it’s
25%). 200 gal. x 1.25=250 gal. 250-200=50 gal. expansion. The FT-200-L has only 46 gal. available for
expansion, so the correct selection is FT-500-L.