Chemical
storage buildings are many times used for the warehousing
of potentially flammable or explosive chemical products that
must be maintained at low temperatures. The interiors of these
buildings are typically classified as Class I, Division 1
(Zone 1), or Class I, Division 2 (Zone 2).
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Application
1:
An explosion-proof refrigeration system was required
for hazardous product storage in a petrochemical plant.
Ventilation of the interior was required prior to personnel
entrance.
A
roof top explosion-proof condensing unit and an indoor
explosion-proof unit cooler (evaporator) were designed
for medium temperature (40ºF) cold storage. A temperature
controller was installed through the door of a NEMA
4 enclosure and set up for type Z pressurization (purge).
The controller kept the room at plus or minus 1ºF.
For
ventilation, an explosion proof roof exhauster was furnished
with a specially designed curb and back draft damper,
both with extra insulating characteristics.
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Application
2:
A medium temperature (40ºF) refrigeration unit
was required for installation on a portable cold room.
The product to be stored was flammable and required
a constant temperature to be maintained inside the room.
The
split refrigeration system utilized a low profile explosion-proof
condensing unit installed on the roof and an explosion-proof
unit cooler mounted inside in one end of the room. A
temperature controller was located on an exterior wall
and set up for type Z pressurization (purge). The indoor
temperature was controlled at 40ºF (plus or minus
1º).
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