| (a) Heated Rooms. The chlorinators and sulfonators
for a system using one-ton cylinders must be located indoors and maintained
at a minimum room temperature of 65 degrees Fahrenheit.
(b) Outdoor Storage.
(1) If one-ton cylinders are stored outdoors, the system
sizing must be done in accordance with §217.273(a) of this title
(relating to Cylinder Requirements for Gaseous Chlorine Disinfection
and Sulfur Dioxide Dechlorination Systems). Calculations supporting
system sizing must be included in the engineering report.
(2) If a one-ton cylinder is stored outdoors, it must
be kept in a storage structure that:
(A) protects the cylinder from direct sunlight; and
(B) allows safe removal and replacement of a cylinder.
(3) A one-ton cylinder stored outdoors may be connected
to heated pipes to prevent gas from liquefying in the transfer pipes.
(c) Heating Blankets.
(1) A heating blanket on a one-ton chlorine gas cylinder
is prohibited.
(2) A heating blanket may only be placed on a sulfur
dioxide cylinder to increase the operating temperature of the sulfur
dioxide system. The design must specify the temperature a heating
blanket may be set to maintain an adequate temperature inside a cylinder,
based on the lowest consecutive seven-day average of the local daily
low temperatures over the last ten years, as measured at the nearest
National Oceanic and Atmospheric Administration's National Weather
Service weather station with at least ten years of records.
(3) The ambient temperature must be used to calculate
a cylinder withdrawal rate in §217.273(a) of this title.
(4) A heating blanket on a sulfur dioxide cylinder
must include a mechanism that ensures that a blanket does not heat
the cylinder surface 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 surface temperature
of less than 100 degrees Fahrenheit.
(5) A cylinder with a heating blanket that is connected
to a dechlorination system must have a downstream pressure-reducing
valve.
(6) A sulfur dioxide system must be capable of automatically
deactivating a heating blanket if high pressure is detected in the
cylinder or delivery system.
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