vessel shall be designed to resist an internal pressure of 1.5 times the
design pressure, including the tubes and shell. Over pressure protection
based on worst case operating conditions shall be provided. The vessels
shall be constructed in accordance with ASME BPVC SEC VIII D1 code.
Viewing ports shall be provided to allow visual inspection of all internal
dielectrics during operation.
2.2.4.2
Dielectric Tubes
Dielectric tubes shall be constructed to resist thermal shock and to evenly
distribute the applied electrical charge over the entire dielectric surface
without arcing. Dielectric tubes shall be formed from either glass or a
non-glass material with a certified voltage breakage strength of 1.5 times
the maximum possible operating voltage under maximum temperature and
applied power conditions. Dielectric tubes shall be protected by fuses or
functionally equivalent devices to prevent shorting dielectric tubes from
damaging the shell and tube structure in the ozone generator.
2.2.5
Ozone Destruct System
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NOTE: High concentrations of chlorinated organics
may be liberated by systems which use ozone in air
or oxygen. These chlorinated organics may "poison"
a catalyst bed designed only for ozone destruction.
If considerable concentrations of chlorinated
organics are anticipated (greater than 1000 ppm) in
the reactor off gas, a chlorine resistant catalyst
should be specified or a separate specification
section should be used.
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Ozone off gas destruction equipment shall be thermal assisted catalyst
destruct type units suitable for moist ozone in [oxygen] [air] service.
The catalyst containment unit, piping, ductwork, and other metallic
components shall be constructed of 316 stainless steel. The units shall be
capable of destroying contactor off gas generated by the ozone generators
which feed the AOP reactors. The ozone destruction unit shall have the
capability to function at a minimum turn down ratio of 20 to 1. Each off
gas destruction unit shall be a skid mounted unit consisting of [a
demister,] an electric resistance heater, catalyst trays and containment
vessel [, and a centrifugal blower]. The destruction unit discharge duct
shall be sloped away from the destruct unit to reduce the probability of
catalyst fouling from condensation. Ducts carrying ozone laden off gas
from the AOP reactors shall be sloped to a low point valved drain located
upstream of the ozone destruct system. The ozone destruct system shall
reduce the ozone concentration from the off gas flow to less than [0.10]
[_____] ppm by volume of ozone from zero flow to the maximum off gas flow
rate. Normal operation is defined as [50] [_____] percent of the maximum
off gas flow rate with an ozone concentration of [1.0] [_____] percent by
weight. Ozone destruction equipment shall meet the following requirements:
Maximum pressure drop through catalyst
[_____] mm of mercury
at maximum flow rate
[_____] inches of water
Maximum pressure drop through heater
[_____] mm of mercury
at maximum flow rate
[_____] inches of water
Maximum off gas relative humidity
[_____] percent
SECTION 11377
Page 24
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