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244 ST 3000 Release 300 and SFC Model STS103 User’s Manual 6/08
B.1 Possible Solutions/Methods, Continued
Electric heating,
continued
Figure B-7 Piping Installation for Process Pressure Transmitter and
Impulse Piping with Electric Heating Control.
Union or coupling
Process pressure
transmitter
Temperature
controller
(thermostat)
Temperature
sensor
Insulated
enclosure
Shut-off valve
Shut-off valve
Electric heating
cable
Steam heating
Steam heating is perhaps the most common, yet potentially the most
damaging method of protecting transmitters from freeze-ups. Since steam
is generated for use in the overall process operation, it is considered an
available by-product. The most important point to remember when steam
heating transmitter meter bodies is the temperature of the steam that will
be used and its pressure. We recommend that you review the next
paragraph Superheated steam considerations to get a better understanding
of the temperature problem with steam heating. In brief, do not assume
that 30 psig steam is 274°F (134°C) and cannot damage a transmitter rated
for 250°F (121°C). With steam heating, as with electrical, you should use
insulated transmitter body housing, impulse piping and valves.
Continued on next page