2.2.17
Level Monitoring
Pressure type level sensors, associated analyzers and transmitters shall be
provided for each liquid process tank associated with the AOP system.
Sensor element shall be removable for servicing or replacement without
taking the tank out of service. As a minimum, the following tanks shall be
equipped with level monitoring equipment: [reactor vessels,] [hydrogen
peroxide storage and feed tanks,] [equalization tank,] [effluent storage
and equalization tanks,] [_____]. Each level control element shall be of
solid state design constructed of materials compatible with the liquid
stored. Each controller shall be provided with an analyzer which receives
the signal from the level sensor, converts and sends it as a [single 4 to
20 mA DC signal proportional to the liquid level] [direct digital reading]
to the central control unit.
2.2.18
Reactor Vessel
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NOTE: Coordinate paragraph Gas Flow Meters
requirements for the application; indicate
penetration requirements, if a packing support is
required; view ports; site glasses; or material
options to stainless steel reactors. Also include
access requirements for removal and maintenance of
diffusers. Coordinate unique concrete material
ozone resistance requirements with Section [03300A
CAST-IN-PLACE STRUCTURAL CONCRETE][03300N
CAST-IN-PLACE CONCRETE] if concrete reactor vessels
are used.
Reactors for peroxone systems, where either the
ozone or hydrogen peroxide dose is not expected to
exceed 25 ppm, may be constructed of fiberglass if
appropriate resins are used. Coordinate with tank
suppliers regarding specification requirements.
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The reactor vessel shall be [circular] [rectangular], fabricated of [316L
stainless steel] [concrete conforming to Section [03300A CAST-IN-PLACE
STRUCTURAL CONCRETE][03300N CAST-IN-PLACE CONCRETE] [_____] provided with
[_____] mm inch, [_____] kPa psi flanged connections.] Reactor vessels
shall have a minimum water depth above the diffusers of [6] [_____] m [18]
[_____] feet, with a minimum free board water depth above the liquid level
of 600 mm 2 feet. [Reactor shall be designed to accommodate a vacuum of
[25] [_____] mm [1] [_____] inch applied to the reactor headspace.]
Welding shall be performed in accordance with AWS D1.1/D1.1M by welders
certified to have passed qualification tests using procedures covered in
AWS B2.1 or ASME BPVC SEC IX. Reactors shall be equipped with openings
required to ensure maintenance and installation/removal of the following
equipment: liquid inlets and outlets, gas inlet supply and off gas
collection points, sampling connections, [quartz sheath wipers], [UV
lamps], [pH probe], [redox meter], [level switch], site glass liquid level
indicator, and other connections as indicated or required. Reactor vessels
shall be equipped with a minimum of [one] [_____] viewing port no smaller
than [0.5] [_____] m [1.5] [_____] feet located [0.7] [_____] m [2] [_____]
feet minimum above the bottom of the reactor. The viewing port shall be
covered with clear plastic material not susceptible to ozone degradation,
with a minimum thickness of [10] [_____] mm [3/8] [_____] inch.
SECTION 11377
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