Sanitary Waste Interceptors ME- Building Group

SECTION 221323 – SANITARY WASTE INTERCEPTORS

PART 1 - GENERAL

1.1  RELATED DOCUMENTS

  1. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division1 Specification Sections, apply to this Section.

1.2  SUMMARY

  1. This Section includes an above grade, shop fabricated, skid mounted, corrugated plate, coalescing oil water separation packaged unit.

1.3  REFERENCES

  1. American National Standards Institute (ANSI) Publication:
  2. B16.1 Cast Iron Pipe Flanges and Flanged Fittings, Class 25, 125, 250 and 800
  3. American Society for Testing and Materials (ASTM) Publications:
  4. A36, Structural Steel
  5. A53, Pipe, Steel, Black and Hot Dipped, Zinc Coated, Welded Seamless
  6. A283, Low and Intermediate Steel Plate of Structural Quality
  7. American Welding Society (AWS) Publications:
  8. D1.1-84 Structural Welding Code, Steel
  9. A5.1 Mild Steel Arc-Welding Electrodes
  10. Steel Structures Painting Council (SSPC) Publication:
  11. SSPC-SP-10 Near White
  12. American Institute of Steel Construction (AISC) Steel Construction Manual, 8th Edition
  13. Plant Fluids: Attached Material Safety Data Sheets.

1.4  SYSTEM DESCRIPTION

  1. Application and Performance
  2. Performance: The coalescing oil/water separator shall be sized to remove non-emulsified oil hydraulic fluids, LNAPL, DNALP, and solids from the wastewater stream and produce effluent containing no more than 10 mg/l (10 ppm) of oil droplets 20 micron or larger. The separation process shall incorporate the use of slant oleophilic, coalescing plates arranged to induce oil droplet impingement on the plate surfaces. The plates shall enhance solids settling without plugging. Solids shall settle into a separate sludge chamber.
  3. Application: The oil water separator shall be used to separate entrained oil droplets from a wastewater stream having a flow rate of 20 gallons per minute. The unit inlet chamber shall be baffled to dissipate hydraulic flow through the system. Influent shall range from 50 to 120 degF, with oils ranging in densities from 0.68 to 0.95. Water specific gravity shall range from 1.0 to 1.03.
  4. Inlet diffusion nozzle shall be non-clogging, and disperse the flow evenly across the depth and width of the coalescing pack. Heavy solids shall separate in the inlet chamber and settle into a sludge collection chamber.
  5. Oil separation chamber shall contain oleophilic coalescing media arranged in a configuration that provides maximum oil coalescing surface and solids settling area per cubic foot of media. Plate spacing to be 3/4 inch and suitable for operation at temperatures up to 120 degF. Flow through the pack to be designed to induce oil droplet impingement on the plate surfaces. Coalesced oil will flow unimpeded along the plate surface to the top of the separation chamber where it is to be automatically decanted.
  6. Oil droplets coalesce from entrainment as the laminar flow moves through the corrugated plates. The oil collects on the ceiling of the flow channel, coalesces into larger droplets and flows upward due to the differential in specific gravity of the oil and water mixture.
  7. Performance: The oil water separator shall remove 100 percent of oil droplets 20 micron or larger at the designed flow rate. Calculations showing flow rate, plate pack area oil droplet buoyancy shall be provided to demonstrate that the specified oil water separator will remove 100 percent of oil droplets larger than 20 microns.

1.5  SUBMITTALS:

  1. Before fabrication, submit the following.
  2. Shop drawings for oil water separator and accessory equipment including principle dimensions and location of fittings. Data shall include weight and distribution of weight with the unit empty and filled with water.
  3. Test results, signed by the manufacturer, which indicate the oil water separator is capable of handling specified effluent concentration, pH, fluid temperature and concentration of oil and grease. Tests on this model shall have been done within the last 3 years.
  4. Calculations of oil water separator loading rate at the design flow rate, designed in accordance with Stokes Law.
  5. After fabrication, submit the following.
  6. Written verification that surface preparation and coating application were performed in accordance with the specification and coating specification and system manufacturer’s printed recommendations.
  7. That the unit was hydraulically leak tested for a period of at least 4 hours.
  8. That the surface preparation and coating process was performed.
  9. Service representative's complete signed report of results of the inspection, operation, adjustment, and tests. Report shall include detailed descriptions of points inspected, tests and adjustments made, quantitative results obtained if such are specified, and suggestions for precautions to be taken to ensure proper maintenance. Include the manufacturer’s certificate that equipment conforms to specified requirements and is ready for permanent operation.
  10. Operation and Maintenance Manual: In addition to the normal Installation, Operation and Maintenance Manuals required by the Construction Documents, submit a spare manual with the unit for use prior to release of final Operation and Maintenance manuals to the Owner.

1.6  QUALITY ASSURANCE:

  1. Manufacturer Qualifications: The manufacturer of the oil water separator and related components shall have been manufacturing oil water separators of the similar type specified in service for at least five years.
  2. Inspection: Examine each component of the oil water separator for compliance with requirements specified. Redesign or modification of equipment to comply with specified requirements, or necessary redesign or modification following failure to meet specified requirements, shall receive particular attention for adequacy and suitability. This element of inspection shall encompass visual examinations and dimensional measurements. Noncompliance with specified requirements, or presence of one or more defects preventing or lessening maximum efficiency of the oil water separator’s operation, shall constitute cause for rejection.
  3. Welder Qualifications:
  4. Welders shall be previously qualified by passing the tests prescribed in the AWS Standard Qualification Procedure, or by passing such other tests as the Architect may accept.
  5. Welders shall have been tested within the past twenty four months and their qualifications shall be considered as remaining in effect unless the welder is not engaged in a given process of welding for a period exceeding six months.

1.7  DELIVERY, STORAGE, AND HANDLING

  1. Delivery and Storage: Inspect materials delivered to site for damage; unload and store with minimum handling. Store materials on site in enclosures or under protective coverings. Protect materials not suitable for outdoor storage to prevent damage during periods of inclement weather, including subfreezing temperatures, precipitation, and high winds. Store materials susceptible to deterioration by direct sunlight under cover and avoid damage due to high temperatures. Do not store materials on ground. Store and protect materials according to manufacturer recommendations.
  2. Handling: Handle the oil water separator in such a manner as to ensure delivery to final location in sound, undamaged condition. Take special care not to damage interior and exterior surfaces of the inclined plate clarifier. Make satisfactory repairs to damaged material(s) at no cost. Carry and do not drag materials. Handle the oil water separator according to manufacturer’s information.

PART 2 - PRODUCTS

2.1  MANUFACTURERS

  1. Provide products by the following:
  2. Hoffland Environmental, Inc
  3. Parkson Corp.
  4. Highland Tank

2.2  FABRICATION

  1. General:
  2. Corrugated plates shall be set at a minimum of 45 degrees above the horizontal plane and the space between plates shall be 0.75 inches.
  3. The maximum flow rate through the inclined plate pack shall not exceed 0.40 gallons per minute per square foot of horizontal projected area. (Horizontal projected area of an inclined plate set at 45 degrees to be approximately 70 percent of the total surface area).
  4. To ensure full utilization of all plate areas, velocities through the unit shall be kept below 1 FPS. Flow velocity calculation shall be submitted for feed ducts, feed bay and plate separators.
  5. The oil water separator shall be provided with minimum 4 inch freeboard at design flow rate.
  6. Plates shall be fabricated of either PVC or fiber reinforced plastic. The plates shall be supported by dividers constructed of stainless steel, Teflon or molded plastic inserts.
  7. Fiber reinforced plastic plates shall be a minimum of 0.06 inches thick FRP. The plates shall have a resin rich surface to prevent fiber show. The plates shall be produced by contact molding or machine extrusion, "hand or spray lay-up fabrication" will not be acceptable.
  8. The plates shall be supported on the sides such that unsupported distances shall not exceed 12 inches. Settling plates wider than 48 inches shall be supported on 12 inch center or provide documentation and test results that the plates will withstand a load of 100 percent filled with sludge, specific gravity 1.4 or above, with all water drained from the separator, without plate collapsing.
  9. Oil reservoir located at the end of the separation chamber shall have an adjustable weir for automatic decant of the separated oil and shall be equipped with two flanged gravity outlet nozzles located on opposite sides of the separator.
  10. Oil reservoir shall be equipped with level monitoring switches to automatically operate the oil transfer pump to evacuate the reservoir periodically. The oil pump controls shall include an Off/Manual/Automatic mode selector switch. Provide oil sight glass with broken glass ball check valves, of sufficient length to display full range of normal operating oil level.
  11. Sludge chamber for settled solids shall be distinct located below the coalescing pack, equipped with 45 degree pitched sides, baffles and two flanged outlet ports. Sludge chamber shall isolate settled solids from wastewater stream. Pump controls shall include an On/Off selector switch to evacuate the sludge chamber. An adjustable timer device shall be incorporated to evacuate a small amount of sludge from the chamber periodically. Timer shall accommodate periods from 0 to 100 hours.
  12. Gasket materials utilized in the plate construction shall be Viton or Teflon. All assembly clips shall be constructed of Teflon.
  13. The oil overflow weir and the final effluent weir shall have adjustable weir plates.
  14. All outlets shall be flanged fittings and there shall be outlets for the sand trap, sludge collection area, oil collection weir and final effluent.
  15. The unit shall be equipped with a gasket sealed cover constructed in easily removal sections and at least one section shall have a 4 inch flange to vent accumulated gases.
  16. Structural:
  17. All structural and tank steel stresses shall be within the allowable limits shown in the Steel Construction Manual of the American Institute of Steel Construction, Eighth Edition.
  18. The unit to be structurally designed for installation seismically in accordance with the local code of the authority having jurisdiction.
  19. Oil Water Separator shall be fabricated from ASTM A36 steel.
  20. Exterior tank welds shall be continuous seal weld.
  21. Provide lifting lugs.
  22. Identification nameplate.

2.3  REQUIRED FEATURES

  1. High Oil Level Switch: Mount in the oil reservoir. Device shall be intrinsically safe relay, with audible and visual alarm in externally mounted in a NEMA 4 local enclosure. 110 volt, 1 phase, 60 Hertz. Control panel shall also use switch signal to stop inlet feed pump.
  2. Oil Pump Out Package: High level-low level float switch mounted in oil reservoir to automatically turn the pump on and off. Local NEMA 4 panel for automatic operation with manual override. Pneumatic operated double diaphragm, positive displacement pump. Pump shall be installed on a platform with air filter, regulator, lubricator and solenoid valve. Two mercury float switches for high level-low level switching to turn pump on and off. All components installed, wired and plumbed with galvanized steel piping.
  3. Pump shall be rated for flow at a maximum viscosity of 100 centipoises, 500 SSU; flooded suction.
  4. Enclosure: Non hazardous, NEMA 4.
  5. Characteristics:

Basis-of-Design Manufacturer / Model / Flow / TDH / Air / Ports
Parkson Corp / DDP-05 / 11 gpm / 60 feet / 70 psi / 1/2 inch In/Out
  1. Sludge Pump Out Package: Pneumatic operated diaphragm positive displacement pump with local NEMA 4, 115 volt, 1 phase, 60 Hertz control panel and intermittent timer. Automatic operation with manual override. All items installed, wired and plumbed with galvanized steel piping.
  2. Pneumatic Operated Diaphragm Pump:
  3. Buna N diaphragm
  4. Characteristics:

Basis-of-Design Manufacturer / Model / Flow / TDH / Air / Ports
Parkson Corp / DDP-0.5 / 5 gpm / 30 feet / 70 psi / 1/2 inch In/Out
  1. Inlet Feed Pump Package: Pneumatic operated double diaphragm positive displacement pump with local control panel. Pump shall be installed on a platform with air filter, regulator, lubricator and solenoid valve. Two mercury float switches for high level-low level switching to turn pump on and off. Local electrical control panel for automatic operation with manual override.
  2. Enclosure: Non hazardous, NEMA 4.
  3. Characteristics:

Basis-of-Design Manufacturer / Model / Flow / TDH / Air / Ports
Parkson Corp / DDP-2.0 / 20 gpm / 60 feet / 70 psi / 2 inch In/Out
  1. Elevated Support Frame: Provide extension legs and necessary structural support framing to elevate all tanks and package accessories 20 inches above the floor. Control panel shall be mounted for access from the floor without platforms.
  2. Expanded Effluent Chamber: Clean water chamber shall be expanded to provide a minimum of 3 minutes retention. High level-low level switch shall be mounted in the reservoir to automatically turn the treated IW transfer pumps on and off. Provide local 115 volt, 1 phase, 60 Hertz electrical panel for automatic operation with intrinsically safe relays and manual override. Pump shall be motor driven, 480 volt, 3 phase, 60 Hertz. Level switch signals shall be isolated 120 volt to generate pump actuation signals to motor control center.
  3. Enclosure: Non hazardous, NEMA 4.
  4. Centrifugal pump design flow is defined as 20 gpm maximum @ 70’ TDH. Manufacturer: Armstrong or equal.

2.4  SURFACE PREPARATION AND COATING

  1. Sandblasting and coating operations shall also be performed at the manufacturers’ facility. The manufacturer shall maintain a quality control staff to perform quality assurance checks during fabrication and assembly.
  2. Surface Preparation: Steel surfaces shall be dry and clean in accordance with the following requirements.
  3. Remove all grease, oils and contaminants as outlined in SSPC SP1.
  4. Remove all weld splatter and grind burrs on cut edges and rough welds smooth.
  5. Blast clean all surfaces after fabrication in accordance with SSPC SP10 with profile depth of 1.5 to 2.0 mils.
  6. Apply first primer before any rust bloom forms.
  7. Caulking: Exterior non-seal welding joints shall be filled with rubber caulking before painting.
  8. Exterior Surfaces:
  9. Shop First Coat: Apply one coat average dry film thickness of two mils minimum, of a high-build catalyzed epoxy. Apply to all steel surfaces except the areas within 2 inches adjacent to field welds and surfaces specified to be hot-dip galvanized.
  10. Shop Finish Coat: Apply one coat average dry film thickness of 1.0 mils minimum, of a polyurethane paint. Recoat at time interval recommended by the manufacturer. Color shall be as selected by the Architect from manufacturer’s standard color chart..
  11. Touch-Up: Field touch-up of damaged and unpainted areas shall be the same as specified first and second coats at the same film thickness.
  12. The total dry film thickness shall be an average of 4 mils.
  13. Interior Surfaces:
  14. Shop First Coat: Apply one coat average, dry film thickness of four mils, of an immersion grade high-build catalyzed epoxy. Apply to all steel surfaces except the areas within 2 inches adjacent to field welds and surfaces specified to be hot-dip galvanized.
  15. Shop Finish Coat: Apply one coat average, dry film thickness of 4 mils, of an immersion grade high-build catalyzed epoxy. Recoat at time interval recommended by the manufacturer.
  16. Touch-Up: Field touch-up of damaged and unpainted areas shall be the same as specified first and second coats at the same film thickness. (Liquid Contact).
  17. The dry film thickness shall be an average of 6 mils.

2.5  SOURCE QUALITY CONTROL