Fulton Vertical Electric (FT-N) Thermal Fluid (hot oil) Heater - Manual (Page 36)

Fulton Thermal Corp.*Electric Thermal Fluid Heaters Manual* Version 2010-0423
Page 36
c) A safety relief valve may be shipped in the parts box accompanying the fuel-fired heater,
and must be installed in the outlet manifold. On all units, the outlet must be piped to a
safe discharge area. The piping from the outlet of the safety valve must be piped to a
catch tank. The discharge flow must not be restricted, i.e. no valve should be installed.
The weight of the piping must be properly supported in order to prevent damage to the
safety valve. If the valve body becomes warped, leakage may result.
19. Gauges
a) The range in which readings are expected to fall should comprise mid-scale on the
pressure gauge chosen. Pressure gauges must be able to withstand overpressure equal
to the rating of the safety relief valves, normally 100 psig.
b) Thermometers should read up to 650°F.
20. Valves
a) Vent and drain valves should normally be 1/2” or 3/4” with internal seals made from
materials suited to use with thermal fluids. They may be of the screw type if installed on
stalks not less than 12” long.
b) Gasketing material specifically suited to the task must be used.
c) Drain valves should be fitted at all low points in the pipework system and ventilating
valves should be fitted at all high points in the installation.
d) Valves must be fitted with either the conventional packed stuffing box seal or a bellows
seal as required. Where the stuffing box is specified, it should be as deep as possible