SECTION 11000-EMERGENCY CHLORINE GAS SCRUBBER (1-Ton)
PART 1 – GENERAL
1.1 General
A. This specification defines the requirements for a dry chemical Emergency
Chlorine Gas Scrubber System.
B. The Manufacturer is advised that all drawings shall show all information
required for approval, installation, startup and maintenance of the equipment
herein specified.
C. The Manufacturer shall provide all equipment and services as indicated below
for the supply of a complete Emergency Gas (Chlorine) Scrubber System,
including media, blower assembly, blower control and starter panel, and
appropriate connections for external duct work.
1.2 Experience, Qualifications and Standards
A. The manufacturer shall have a minimum of five (5) years experience in the
design, fabrication, installation, and testing of systems that are effective in
converting chlorine to non-toxic solids.
B. Manufacturer shall supply a list of 5 installations of dry scrubbers of similar
capacity to the owner with the bid, including description of installation and
owner contact/reference information.
C. Equipment supplied shall meet all local, state and federal regulations having
jurisdiction over the equipment and final use, including but not limited to
requirements of the Uniform Fire Code and the Occupation Safety and Health
Administration. In addition, the equipment shall meet all current requirements,
recommendations, and suggestions published by the Chlorine Institute.
D. The manufacturer shall provide units to meet the minimum values specified for
design, and intent of this specification. The vessel, blower, and media shall
function as a system and shall be the end product of the manufacturer to
achieve standardization in operation, maintenance, spare parts, and the if
authorized manufacturer's services.
E. The manufacturer shall be Pure Air Filtration, LLC of Norcross, GA or preapproved equal. Pre-approval required 14 days before bid date
1.3 Manufacturer Submittals
A.
Shop Drawings: The CONTRACTOR shall furnish Shop Drawings of the entire
scrubber system and all items and accessories in accordance with the
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requirements of Section 01300 – Contractor Submittals. Indicate media capacity
by weight.
B.
Media Analysis – Confirmation testing shall be performed as described in Section
4.0.
C.
Testing and Inspection - Prior to shipment, the manufacturer shall provide written
verification to the Owner that the unit has been inspected and tested and found
to be free of material or workmanship defects, and functions as intended.
PART 2 – PRODUCT
2. GENERAL AND VESSEL/BLOWER
2.01 General
A. The Emergency Chlorine Gas Scrubber (ECGS) shall be configured to allow
discrete sampling of the entire height/length of the media column/bed to
determine the extent of spent media, and to allow replacement of the spent
media without removing and replacing the entire media column/bed. Discrete
beds may be preferred for ease of operations and maintenance.
B. The blower shall be sized to draw a minimum of 4000 cfm initial airflow
through the scrubber system, under ambient air conditions and for 100%
saturated air at 100ºC; and to assure sufficient air/Cl2 mixture flow, under
maximum Cl2 release conditions, to maintain a partial vacuum throughout the
Cl2 storage room. The manufacturer shall verify that the blower size is
sufficient based on the attached drawings, and recommend any changes to
the sizing.
C. Blower static pressure rating, on air, and at standard conditions, should be
sufficient to achieve the intended minimum mixture flow rate, based on
operational test results.
D. The ECGS shall be designed, and verified by testing as described in Section
4.0, to assure that discharge air contains less than 1 ppm Cl2, while operating
at design Cl2 loading rates.
E. Major components of the scrubber system, starting at the air inlet end, shall
include:
1 Corrosion Resistant Inlet Plenum with 18" circular duct connection
2 Corrosion Resistant Media Support Grids and Media Bed(s)
3 Corrosion Resistant Housing
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4 Corrosion Resistant Discharge Plenum with 18" circular discharge duct
connection
5 Dry Adsorbent Media
6 Blower-Motor Assembly
7 Control/Motor Starter Panel.
F. The ECGS system shall be factory assembled prior to shipping. If necessary,
the ECGS system can be manufactured in pieces to facilitate installation
through the pre-fabricated opening into an existing scrubber room. If the unit
is provided in pieces, then detailed assembly instructions shall be included
with the unit.
G. Scrubber housing and major structural members shall be fabricated of
corrosion resistant and chlorine resistant material suitable for the application.
Materials of construction shall be bid as alternates and may include:
Temperature resistant Fiberglass Reinforced Plastic (FRP).
FRP shall be constructed in accordance with ASTM D-3299 standard
specifications. The resin used shall be suitable for continuous exposure to a
wet chlorine/air mixture with maximum operating temperature of 200°F. A
certified letter of suitability for all resins must be submitted with the bids. A
corrosion barrier on the inner surface shall be a Hetron 922 vinyl ester resin
measuring a minimum of 10-20 millimeters. The resin shall be composed of
reinforced non-continuous glass fiber strands applied in two plies of chopped
strand mat equivalent to three oz/ft. The inner resin layer shall not exceed
10% + 15% "C" glass by weight. Filament wound laminates shall have an
average glass concentration of 50-55% by weight. Hand Layup laminates
when used on the vessels and equipment shall be fabricated to meet the
physical properties in accordance with PS 15-69 product standard. Press
molded or compression mold flanged nozzles are acceptable up to and
including 6 inch nominal size. All cut-walls shall be reinforced as required by
ASTM D-3299.
H. Scrubber housing and all components which will hold a chlorine release shall
be fabricated without caulked, screwed or riveted joints, but rather seamless
materials, welded construction, or gasketed joints (gasket material must be
compatible with chlorine).
I. Design and fabrication of the scrubber shall take into consideration the
drawings attached to the contract documents.
2.02 Media Containment Section
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A. If discrete media beds are used, each media bed shall be contained between
separate corrosion resistant support grids and perforated sheet material to
provide media support while imposing a minimum resistance to air flow.
B. The media containment section(s) shall be designed for bulk placement of
new media into the unit through latched access hatches; and removal from the
unit by vacuuming or manual handling, through media unload doors.
E. The media containment section(s) shall be separated to assure filling and
removal of individual beds as required. Specially designed fill chutes shall
allow for media settling, but shall preclude bypass of contaminated air.
2.03 Blower Section
A. The fiberglass blower shall be an externally mounted, belt driven, with
backward inclined blades, sized to deliver 4000 cfm of airflow while adsorbing
chlorine at the design rate. Blower must be located to cause air (gas) to be
drawn through the scrubber, thus maintaining the scrubber internal
atmosphere at a slight vacuum. Motor shall be Mill & Chem rated. The blower
shall be a New York Blower FE24, or Ceilcote Club 1825, or approved equal.
The blower shall be 20 HP, 240/480 V, 3 phase, 60 Hz.
2.04 Differential Pressure Instrumentation
A. A gage shall be included with the scrubber to permit local read-out of pressure
drop through the media stage(s).
2.05 Control/Instrumentation/Motor Starter Panel(s)
A. The blower motor starter and control panel shall be UL rated. The controls
shall include low voltage signals to allow remote and local operation of the
blower (i.e. on/off). The control panel shall allow for reception of a signal from
existing chlorine sensors in the chlorine storage room in or to activate the
blower.
B. The blower shall only be turned off manually.
3. MEDIA
3.01 General
A. The ECGS system shall contain enough media to safely scrub an over-filled 1ton chlorine cylinder (2,350 pounds).
B. The chlorine removing media shall have been tested for conformance with the
specifications and removal requirements, and have been installed in at least
five prior and similar applications. No media formulation which has not been
proven in at least five installations shall be utilized.
C. If a separate or subcontract media supplier is utilized, the bids shall include
technical qualifications for the media supplier, and the bid shall be submitted
as a partnership.
D. The media shall be suitably impregnated with chemicals to enhance the
capacity for removal of chlorine; and to chemically react to produce solid
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reaction products within the media. Activated carbon shall not be used due
incompatibility with chlorine.
E. Impregnants shall be applied during pellet formation, such that the impregnate
is uniformly distributed throughout the pellet volume.
F. Media shall be capable of absorbing and removing chlorine throughout the
entire pellet volume and shall be totally nonflammable and shall be UL
Classified, Class 1.
G. The media shall have the following characteristics:
Average crush strength: 12# on a representative sized media particle
Average Density: 50#/ft3
Average media diameter: 1/8 to 3/16”
Media will not dissociate in water
4. TEST RESULTS
A. With the bids, provide test results showing that the media that will be supplied
is capable of maintaining a continuous air discharge containing less that 1 ppm
Cl2 concentration throughout the test. The test is meant to simulate the
release and subsequent chlorine removal from a catastrophic tank failure.
During the course of the test, the same total flow rate of gas is maintained
through the bed. However, the chlorine concentration shall be equivalent to
400 lbs in the first minute followed by 80 lbs per minute for the remainder of
the test. The first minute simulates the initial flash of chlorine, then the
remaining time simulates the subsequent evaporation of the remaining
chlorine.
5. ANALYTICAL SERVICES AND MEDIA REPLACEMENT
A. The manufacturer shall, after start-up, provide a service, free of charge to the
owner, to instruct the owner in media sampling; and shall provide appropriate
lab analysis to determine the remaining life cycle of the media.
B. Such service shall be provided at the manufacturer's expense for a period of
ten years.
C. If Authorized, the manufacturer shall provide a media replacement warranty
valid for 10 years from the date of start-up of the unit. The warranty shall
provide replacement of the media in the event that more than 50% of the
media in the scrubber is consumed.
The manufacturer shall furnish
replacement media as required to reinstate the scrubber to its full capacity for
2,350 lbs of chlorine. The Owner shall be required to provide media samples
for testing to the manufacturer at a minimum of once a year.
6. PRE-PRODUCTION AND START-UP SERVICES
A. Prior to finalizing the shop drawings, the manufacturer shall visit the site and
perform a pre-design analysis of the proposed installation facilities to verify that
the proposed scrubber can be installed and will work as intended, and to assist
the owner with design of the installation drawings.
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B. Upon completion of the installation and as part of the manufacturer's field
services, a total of 2 consecutive days (8 hour days) shall be provided to instruct
the owner's staff on system operation, maintenance, and media sampling.
C. Field performance tests shall be conducted by the gas scrubber manufacturer
and performed for 4 hours. The gas scrubber shall be tested for compliance with
the specifications to demonstrate that all components function properly and that
the unit produces the required airflow rate. The gas scrubber system will be tested
using the automatic method of control. All control work shall be completed prior to
the field tests. The field tests will not require leaking of chlorine, except to activate
the gas detectors. Field testing shall include measurement of at least the
following:
1. Airflow rate from the chemical storage room.
2. Pressure drop through the scrubber.
***END OF SECTION***
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