ASME Pressure Vessels and Water Storage Tanks - page 38

38 •
Chlorine Contact Vessels
Chlorine Contact Tanks (CCT) are
typically used with chlorine injection
equipment in a well water system to
help comply with strict new drinking
water standards. This process vessel
is specifically designed to achieve
sufficient contact time between the
injected chlorine and the water that
needs disinfection.
Chlorination is the most common
disinfection method for public and
private drinking water systems. This
disinfection process is necessary to kill
disease-causing bacteria in the water.
In order to be sure the added chlorine
is killing the bacteria, the water must
have sufficient contact time with the
injected chlorine for proper disinfection.
CCT have an inlet on one end and an
outlet on the opposite end. The water
flows through a series of internal mixing
baffles and perforated high efficiency
mixing baffles to lengthen the contact
time water has with the injected
chlorine before it leaves the vessel.
Highland Tank manufactures two
models of CCT. The standard models
achieve 50% efficiency which is
considered average contact time for
chlorination. The premium models
achieve an impressive 70% efficiency.
Both designs ensure full chlorine/water
mixing and sufficient contact time.
The high-efficiency models’ hydraulic
flow characteristics are proven to
meet or exceed industry standards
by providing an efficient engineered
system to meet requirements of the
EPA
s Surface Water Treatment Rule.
Use of these superior CCT results in
superior contact time and decreased
treatment costs.
Sizing for CCT is related to the flow rate
and tank efficiency. The standard 50%
efficiency CCT typically require a larger
vessel than the 70% efficiency models.
Highland Tank
s CCT are lined with
maintenance- free, non-contaminating
epoxy or polyurethane lining, approved
by NSF as suitable for the storage of
potable water.
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