| (a) Heated Rooms.
(1) A chlorine and sulfur dioxide system that uses
150 pound cylinders must be located indoors at a minimum room temperature
of 65 degrees Fahrenheit. This provision applies to all chemical feed
equipment, including all connected cylinders, the chlorinators, and
the sulfonators.
(2) An unconnected chlorine or sulfur dioxide cylinder
may be stored outdoors, but the cylinder must reach a surface temperature
of at least 65 degrees Fahrenheit before it is connected to a system.
(b) Heating Blankets.
(1) Heating blankets on chlorine gas cylinders are
prohibited.
(2) A heating blanket may only be placed on a sulfur
dioxide cylinder in a temperature-controlled room to increase the
temperature inside the cylinder to above the ambient room temperature.
(A) A heating blanket on a sulfur dioxide cylinder
must include a mechanism that ensures that a blanket does not heat
a cylinder above 100 degrees Fahrenheit. The engineering report must
include a calculation that documents the setting for a heating blanket
to maintain a sulfur dioxide cylinder temperature of less than 100
degrees Fahrenheit.
(B) A cylinder with a heating blanket that is connected
to a dechlorination system must have a downstream pressure-reducing
valve.
(C) A sulfur dioxide system must be capable of automatically
deactivating a heating blanket if high pressure is detected in the
cylinder or the delivery system.
(c) Outdoor Storage. If a 150 pound cylinder is stored
outdoors, it must be kept in a storage structure that:
(1) protects the cylinder from direct sunlight; and
(2) allows safe removal and replacement of the cylinder.
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