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- SECTION 11305
-
- ODOR CONTROL SYSTEM
- NOTE ** Warminster Fiberglass Co. odor control system.
- NOTE **
- NOTE ** This section is based on products manufactured by
- Warminster Fiberglass Co., which is located at the
- following address:
- NOTE ** P.O. Box 188
- NOTE ** Southampton PA 18966-0188
- NOTE ** Tel: (215) 953-1260
- NOTE ** Fax: (215) 357-7893
- NOTE **
- NOTE ** Warminster Fiberglass Co. has manufacturing
- facilities in Southampton PA and in Jacksonville
- TX, and manufactures gas-tight launder covers which
- entrap 94 to 98 percent of the foul odor emissions
- from sewage treatment plant clarifiers. Custom
- designed hoods are installed in new and existing
- sewage treatment plants on both round and
- rectangular clarifiers, sludge thickeners,
- channels, etc.
- NOTE **
- NOTE ** SECTION 11305 - ODOR CONTROL SYSTEM, Copyright
- 1997, The Architect's Catalog, Inc.
-
- NOTE ** Warminster manufactures a wide line of fiberglass
- reinforced polyester resin products for the water
- and waste treatment industry, including instrument
- consoles, Palmer-Bowlus flumes, Parshall flumes,
- slide gates, wash troughs, finger weirs, weir
- plates, scum baffles, metering manholes, and
- density current baffles, in addition to odor
- control systems.
- NOTE **
- NOTE ** Warminster also manufactures fiberglass doors and
- frames and buildings, shelters, and enclosures for
- a wide range of uses.
-
- PART 1 GENERAL
-
- 1.1 SECTION INCLUDES
-
- A. Fiberglass reinforced plastic odor control system for
- sewage treatment plant clarifiers and sludge thickeners,
- and including:
- 1. Odor hood (Launder covers).
- 2. Ductwork.
- 3. Exhauster.
- 4. Scrubber.
-
- 1.2 RELATED SECTIONS
- NOTE ** Delete any sections below not relevant to this
- project; add others as required.
-
- A. Section 11201 - Wash Troughs.
-
- B. Section 11202 - Effluent (Collection) Troughs (Launders).
-
- C. Section 11203 - Finger Weir Pans.
-
- D. Section 11204 - Weir Plates, Scum Baffles, and Brackets.
-
- E. Section 11205 - Density Current Baffle System.
-
- F. Section 11206 - Palmer-Bowlus Flumes.
-
- G. Section 11207 - Parshall Flumes.
-
- H. Section 11208 - Metering Manholes.
-
- I. Section 11225 - Clarifiers.
-
- J. Section 11286 - Slide Gates and Guides.
-
- K. Section 11380 - Sludge Digestion Equipment.
-
- L. Section 13122 - Pre-Engineered Fiberglass Buildings.
-
- M. Section 13230 - Digester Covers and Appurtenances.
-
- N. Section 13260 - Sludge Conditioning Systems.
-
- O. Section 13411 - Instrument Consoles.
-
- 1.3 REFERENCES
- NOTE ** Delete references from the list below that are not
- actually required by the text of the edited
- section.
-
- A. AMCA 210 - Laboratory Methods of Testing Fans for
- Rating.
-
- B. AMCA 300 - Reverberant Room Method for Sound Testing of
- Fans.
-
- C. ASTM D 256 - Standard Test Methods for Determining the
- Pendulum Impact Resistance of Notched Specimens of
- Plastics.
-
- D. ASTM D 570 - Standard Test Method for Water Absorption of
- Plastics.
-
- E. ASTM D 638 - Standard Test Method for Tensile Properties
- of Plastics.
-
- F. ASTM D 648 - Standard Test Method for Deflection
- Temperature of Plastics Under Flexural Load.
-
- G. ASTM D 696 - Standard Test Method for Coefficient of
- Linear Thermal Expansion of Plastics Between -30 degrees
- C and 30 degrees C.
-
- H. ASTM D 790 - Standard Test Methods for Flexural
- Properties of Unreinforced and Reinforced Plastics and
- Electrical Insulating Materials.
-
- I. ASTM D 2583 - Test Method for Indentation Hardness of
- Rigid Plastics by Means of a Barcol Impressor.
-
- 1.4 SYSTEM DESCRIPTION
-
- A. Supply odor control system complete with odor control
- launder covers, ductwork, damper, exhauster, and
- scrubber.
-
- B. The system shall be the responsibility of a single
- manufacturer.
-
- C. Design Requirements:
- NOTE ** Insert the required cubic feet per minute and
- velocity in the blanks below.
- 1. Design to operate at _____ CFM at ______ feet per
- minute velocity so as to evacuate the air and gases
- beneath the cover down to the water line in the
- trough at least 12 times per hour throughout the
- entire system.
- 2. Mold the combination odor hood launder cover and scum
- baffle in one piece to form a confined region free
- from irregularities or air gaps.
- 3. The system shall be totally sealed.
-
- D. Performance Requirements
- 1. Design, install, and calibrate to comply with the
- field test requirements specified in Part 3 of this
- section.
-
- 1.5 SUBMITTALS
-
- A. Submit under provisions of Section 01300.
-
- B. Product Data:
- 1. Complete details and specifications of the scrubber
- system.
- 2. Certification of exhauster performance.
- 3. Test results of balsa-core and fiberglass reinforced
- plastic laminate.
-
- C. Shop Drawings:
- 1. Show critical dimensions, jointing and connections,
- fasteners and anchors.
- 2. Materials of construction.
- 3. Core material and flatness
- 4. Size of ductwork, dampers, handles, fasteners, gasket
- profiles.
- 5. Sizes, spacing, and locations of structural members,
- connections, attachments, openings, fasteners, and
- loads.
- 6. Field measurements.
-
- D. Samples:
- 1. 8-inch square samples of fiberglass reinforced
- plastic laminate with core materials typical to odor
- hood.
-
- E. Quality Control Submittals:
- 1. Certified test results of air flow and H2S gas
- control from at least one of the manufacturer's
- installations. Test results shall have been recorded
- through air/gas test ports located above the trough
- in each segment.
- 2. The name, address, phone number and location of 3
- installations with equipment similar to that
- specified and which has performed satisfactorily for
- at least 3 years. Include the name of the
- engineering firm, contractor, and plant manager.
-
- F. Design Data:
- 1. Size and details of inlet duct and exhaust duct with
- damper.
- 2. Location and details of velocity measurement ports,
- CFM and velocity in FPM, and size of exhauster in CFM
- necessary to evacuate the air and gases beneath the
- cover down to the water line in the trough 12 times
- per hour.
-
- G. Certificates:
- 1. Drawings reviewed and certified for compliance with
- the plans and specifications.
- 2. Manufacturers' certificate of compliance with the
- plans and specifications.
-
- H. Manufacturer's Instructions:
- 1. Manufacturers' complete step-by-step installation
- instructions.
-
- I. Manufacturer's Field Reports:
- 1. Certification that the system has been inspected,
- tested, calibrated, and meets the air-flow design
- criteria of the specification.
- 2. Certified test results recorded at each air velocity
- and gas test port from each clarifier in the system.
-
- J. Contract Close-out Submittals:
- 1. Operation and Maintenance Data.
-
-
- PART 2 PRODUCTS
-
- 2.1 MANUFACTURERS
-
- A. Provide products manufactured by Warminster Fiberglass
- Company; P.O Box 188, Southampton PA 18966-0188; ASD.
- Tel. (215) 953-1260, Fax. (215) 357-7893.
-
- B. Products from other manufacturers will be considered for
- substitution prior to receipt of bids. Requests for
- substitution after bids have been received will not be
- considered. Requests for substitution must include the
- following information in order to be considered:
- 1. Formal written request certifying that products to be
- substituted will match specified products in terms of
- structural properties, dimensions, physical
- appearance, quality level, and quantities, and that
- they will perform the same function in the same
- manner and will achieve the same end result.
- 2. Manufacturer's and supplier's material data sheets,
- specifications, and performance data.
- 3. A list of three or more projects in satisfactory
- service for not less than three years that use
- products identical to those being proposed for
- substitution. For each project, include name,
- address, and telephone number of the engineer, the
- contractor, and the plant manager.
-
- 2.2 MATERIALS
-
- A. Fiberglass reinforced polyester resin composite laminate
- shall exhibit the following minimum properties:
- 1. Impact, Notched, Izod (ASTM D 256): 10 ft. lb.
- per/in.
- 2. Heat Distortion Point (ASTM D 648): 175 degrees.
- 3. Water Absorption (ASTM D 570): 0.2 percent 24 hours.
- 4. Tensile Strength (ASTM D 638): 11,000 PSI.
- 5. Thermal Expansion (ASTM D 696): 10.5x10(-6)
- in/in/deg F.
- 6. Flexural Strength (ASTM D 790): 18,000 PSI.
- 7. Flexural Modulus (ASTM D 790): 0.9 x 10(6).
- 8. Hardness Test, Barcol (ASTM D 2583): 40 minimum.
-
- B. Perform hardness tests on the resin-rich surfaces of the
- test samples.
-
- C. Prepare test coupons in accordance with the appropriate
- ASTM test method.
-
- D. The manufacturer shall maintain a continuous quality
- control program and upon request shall furnish certified
- test results of the physical properties.
-
- 2.3 COMPONENTS
-
- A. Launder/Weir Cover with Scum Baffle:
- 1. The odor hood shall consist of many segments, each
- one being molded as a one-piece unit of composite
- construction consisting of gel-coat, polyester resin,
- balsa-core, steel tubing, and fiberglass
- reinforcement. Each segment shall be molded with a
- downward vertical flange at each end and radial to
- the centerline, shop drilled for assembly. Each
- joint shall be sealed with a 1/4 inch x 3-1/2 inch
- neoprene sponge gasket.
- 2. Fabricate to form a totally sealed air-and-gas-tight
- system to ensure complete removal of air and gas at a
- rate of 12 air changes per hour at the specified
- velocity measured at each air/gas test port in the
- system.
- 3. There shall be no air gaps permitted.
- 4. Mold the scum baffle and top cover in one-piece on a
- curved mold to form and maintain the true circular
- shape of the clarifier and the scum skimmer diameter.
- The scum baffle shall be 1/4 inch thick, minimum.
- 5. No further adjustment shall be necessary at
- installation to maintain a true, molded-in circular
- shape throughout the entire circumference.
- 6. Separate scum baffles, if used, shall be bolted to or
- sealed and gasketed between the top of the baffle
- where it intersects with the top cover.
- 7. Laminate thickness: Not less than 1/8 inch thick on
- both the exterior and the interior of the cover.
- 8. Interior core material: Not less than 1 inch thick
- balsa core molded-in the full width and length of
- each segment. Steel Tubing 1 inch x 1 inch x 1/8
- inch shall be molded in radially between and at each
- end of the weir hatch openings, the full width of the
- walking surface, and 1 piece molded-in parallel to
- the weir hatch opening at each location.
- 9. Air velocity and gas measuring test ports: Molded-in
- at the trough centerline of each segment.
- 10. Slope top cover toward the scum baffle at assembly
- from 1/8 inch to 1/4 inch for complete drainage of
- water.
- 11. Mold top cover flat within 1/16 inch.
- 12. Anti-skid surface coating of angular silica particles
- applied to the walking surface of each segment.
- 13. There shall be 3 weir hatch covers in each segment.
- 14. Provide separate fiberglass circular wall angles and
- scum baffle brackets for supporting the odor hood and
- for flexibility and adjustability in setting the
- elevation and the skimmer diameter of the scum
- baffle.
-
- B. Weir Hatch Covers:
- 1. Match-metal-die molded using sheet molding compound
- (SMC).
- 2. Vertical flange 9/16 inch high all around.
- 3. 41-3/8 inch long by 7-5/8 inch wide by 3/16 inch
- thick.
- 4. Attach cover to odor hood with 2 type 304 stainless
- steel piano hinges 0.050 inch thick by 4 inch long by
- 2 inch (open).
- 5. Hand pull molded-in as an integral part of the cover,
- 5 inch long by 3-1/4 inch wide by 1-1/2 inch deep
- with solid stainless steel bar for lifting.
- 6. Seal perimeter with a continuous extruded neoprene
- rubber "P" gasket bonded to the vertical leg with a
- corrosion resistant adhesive.
-
- C. Ductwork:
- 1. Size to remove 100 percent of the air and gas beneath
- the cover at the rate of 12 changes per hour, in a
- totally sealed system, at the specified velocity.
- 2. Provide one inlet duct and one air flow equalization
- splitter, air flow directional baffle beneath the
- cover.
- 3. Locate the inlet duct 180 degrees from the exhaust
- duct.
- 4. Provide one exhaust duct for removing 100 percent of
- the air and gas beneath the cover at a minimum rate
- of 12 changes per hour.
- 5. Mount 1 fiberglass, round, manual, butterfly control
- outlet damper in the exhaust duct for calibration of
- the velocity of air to meet 12 changes per hour.
-
- D. Exhauster:
- 1. Provide 1 fiberglass radial fume exhauster for
- removal of highly corrosive H2S gases.
- 2. Flanged inlet and outlet dimensions shall conform to
- standard PS 15-69 or ANSI 150.
- 3. Steel shaft shall have an FRP sleeve bonded to the
- wheel backplate and extending out through housing
- shaft hole.
- 4. Size fume exhauster to develop 12 air changes per
- hour in a totally sealed odor control system at the
- specified velocity.
- 5. Exhauster shall be certified to meet the ratings of
- tests performed in accordance with AMCA standards 210
- and 300 and comply with the requirements of the AMCA
- certified ratings program.
-
- E. Scrubber:
- 1. Provide pre-engineered model Series VBS odor control
- scrubber system with air flows compatible with the
- odor hoods, ductwork, and fume exhauster.
- 2. Design scrubber to neutralize H2S and other sewage
- odors at a rate of 12 air changes per hour in a
- totally sealed odor control system at the specified
- velocity.
- 3. Scrubber system shall be of the following type:
- NOTE ** Select one of the following scrubber systems:
- a. Wet neutralization.
- b. Wet caustic.
- c. Catalytic.
- d. Carbon adsorption.
-
-
- PART 3 EXECUTION
-
- 3.1 EXAMINATION
-
- A. Verify that project conditions are suitable for system
- installation. Correct any deficiencies before
- proceeding.
-
- 3.2 INSTALLATION
-
- A. Install system in accordance with manufacturer's detailed
- instructions.
-
- B. Check and seal leaks between the top cover and the scum
- baffle when the two are separate pieces. Air gaps are
- unacceptable.
-
- C. Tolerances:
- 1. The scum baffle diameter shall be set accurately to
- plus or minus 1/4 inch, and shall match precisely
- with the circularity of the scum skimmer mechanism.
-
- 3.3 FIELD QUALITY CONTROL
-
- A. Upon completion of installation, Contractor shall perform
- the testing, inspection, and calibration functions listed
- below.
-
- B. Inspection:
- 1. Verify that the entire system is balanced to function
- at the designed air flow rate in CFM and FPM.
- 2. Check system for leakage.
- 3. Seal gaps, cracks, and leaks with a RTV silicone
- sealant.
- 4. No air gaps will be accepted.
-
- C. Tests:
- 1. Test and record velocity of air flow at each test
- port.
- a. The system shall operate at not less than 90
- percent of the design air velocity at the inlet
- and each air velocity test port.
- b. The system shall operate at not more than 15
- percent above design at the exhaust duct.
- 2. At each gas test port, test and record H2S gas in
- PPM, 1 inch above water level in trough.
- a. The test result shall show maximum gas removal
- every 5 minutes with no dead air spaces.
-
- D. Calibrate the scrubber system until the H2S gas is
- neutralized in the exhaust air stream, at a minimum of 12
- air changes per hour through a totally sealed system.
-
- 3.4 CLEANING
-
- A. Leave the project site clean and free of debris.
-
- 3.5 DEMONSTRATION
-
- A. Demonstrate system adjustment, operation, maintenance to
- the Owner.
-
- END OF SECTION
-