115.6031.0 - 38 -
The source of Sulfur Dioxide must be at least 55°F in order to have sucient pressure to allow the feed system to operate at
its full capacity.
Alternately air padding of the source container may be used to maintain pressure.
Another alternative is to use a Sulfur Dioxide compressor. An article entitled “COLD WEATHER DECHLORINATION” written by
David W. Sloan (December 1990, WATER/ENGINEERING and MANAGEMENT,) describes such a system.
Figure 13 - Sulfur Dioxide: Temperature - Pressure Relationship
20
40
60
80
100
120
40 60 80 100 120 140 160 180 200
0° F SUPERHEAT
30° F SUPERHEAT
TEMPERATURE ( IN °F )
137.9
275.8
413.7
551.6
689.5
827.4
37.84.4 15.6 26.7 48.9 60.0 71.1 82.2 93.3
TEMPERATURE ( IN °C)
PRESSURE ( IN PSIG )
PRESSURE ( IN kPa)
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