Fulton Vertical Electric (FT-N) Thermal Fluid (hot oil) Heater - Manual (Page 30)

Fulton Thermal Corp.*Electric Thermal Fluid Heaters Manual* Version 2010-0423
Page 30
construction, proper flanging, gaskets, and other appropriate means of eliminating
potential leakage must be employed.
12. General
a) All components exposed to thermal fluid flow, including pipe, valves, and screens, must
not be made out of copper, copper alloys, aluminum, or cast iron. Cast iron is porous to
thermal fluids, and copper and aluminum act as catalysts in the degradation of some
thermal fluids. Carbon or stainless steel, or ductile iron, are recommended.
b) For standard applications, all components must be rated to 650°F unless otherwise
stipulated.
c) All pipework, valves, and user equipment must be suited to the maximum operating
pressure of the heater. The maximum pressure stamped on the heater nameplate is
typically 150 psig (690 kPa).
d) If an isolating valve is completely closed, the pressure in the system will rise to the
deadhead pressure of the pump. Suitably sized pipe will enable the system to withstand
the total head generated by the circulating pump, should this occur. In applications where
it is desirable to design to pressures lower than 100 psig, an alternative safeguard is to
install appropriately sized safety valves.
e) Where secondary circulating pumps are installed, the system must be suitable for the
aggregate head, against a closed valve, of both pumps.
f) During construction of the installation, ensure that no dirt, water, or residue from welding
is left in the system.
13. Equipment
a) Heaters that are skid mounted with pumps and tanks are equipped with a y-strainer, a
flex connector and a valve in the inlet run between the pump and the combination tank.
Piping between the discharge of the pump and the inlet of the heater will include a flex
connector and a valve.
14. Piping
a) All pipework should be constructed from seamless mild steel pipe, conforming to ASME
SA 106B or SA 53B, Schedule 40 or equal.
b) Expansion joints or properly designed and sited loops should be provided to
accommodate thermal expansion. Thermal expansion should be calculated using the
maximum possible utilization fluid temperature, regardless of whether the pipe
considered is in the feed or return circuit. Steel pipe will expand approximately 1 “ per
100’ over a 100° F. temperature rise (1 mm. per meter over 100°C. rise).