SOW Oil Water Separator.pdf

Project Description: 197th RTI Oil Water Separator ( Separator Only, No install required No Training Required)

Scope

The separator shall be designed for gravity separation of free oils (hydrocarbons and other petroleum products) along with some settleable solids from wastewater associated with Wash Rack (Horizontal Engineer Equipment Cleaning) operations. Separator shall be prefabricated with inclined, parallel, flat/ corrugated plate and impingement coalescers. Separator shall be installed underground with top access at or above grade level. The source of the influent to the separator shall be gravity flow from stormwater runoff, hydrocarbon spills, and/or cleaning/maintenance operations.

Specifications

Provide 550-gallon Underground Single-wall Parallel Flat/Corrugated Plate Gravity Displacement Oil/Water Separator(s). Separator shall be furnished with oil level alarm and leak detection systems having a total volume of 550 gallons to comply with Spill Prevention Control and Countermeasures (SPCC) plan requirements at the facility. The sizing of this oil/water separator is consistent with industry protocols for complying with the minimum federal spill and discharge regulations. A separator of smaller volume is not permissible.

Separator to be furnished with a Corella® inclined parallel flat/corrugated plate coalescer or like item that simultaneously separate free oil droplets and settleable or suspended solids particles from water without clogging of the coalescer.

Quantity: __1____

Nominal Dimensions:

Nominal Diameter: 3-feet, 6-inches, as indicated on the drawings.

Nominal Length: 7-feet, 9-inches, as indicated on the drawings.

Performance

Influent Characteristics

Provide separator designed for intermittent and variable flows of water, oil, or any combination of non-emulsified oil-water mixtures ranging from zero to 55 gal/min. Nominal separator retention time shall be 10 minutes, based on total unit volume. (Actual retention time will be less due to air space above fluid level).

Typical operating temperature range of the influent oil in water mixture: 40º F to 80º F.

• Installation site operating temperatures: Minimum ___40__ º F, Maximum ___110__ º F.

Typical specific gravity range of the oils at operating temperatures: 0.71 to 0.92.

• Installation site oils specific gravity: __.92__.

Typical specific gravity range of the fresh water at operating temperatures: 1.00 to 1.03.

• Installation site fresh water specific gravity: _1.03___.

Effluent Characteristics

The free oil and grease concentration in the effluent from the separator shall not exceed 10 mg/l (10 PPM) to satisfy requirements of the NPDES stormwater discharge permit. To achieve this goal, it will be necessary to remove all free oil droplets equal to and greater than 20 microns.

wayne.ritter Highlight

Design Criteria

Separator shall be designed in accordance with Stokes Law and the American Petroleum Institute Publication 421, "Monographs on Refinery Environmental Control - Management of Water Discharges; Design and Operation of Oil/Water Separators.” The total effective surface area of the parallel-corrugated plate coalescer shall be determined by OWS manufacturer for the flow, temperature, and oil specific gravity conditions specified above. The total effective surface area of the polypropylene impingement coalescer shall be determined by OWS manufacturer for the flow, temperature, and oil specific gravity conditions specified above.

Calculations, signed and stamped by a Registered Professional Engineer shall be submitted to document specified effluent quality based on complete removal of the specified oil globule. A separator with lower effective surface areas is not permissible.

Separator capacities, dimensions, construction, and thickness shall be in strict accordance with Underwriters Laboratories, Subject UL-58 Standard for Safety, Steel Underground Tanks for Flammable and Combustible Liquids, Single-wall construction. Separator shall comply with National Fire Protection Association standards.

Separator shall be the standard patented product of a steel tank manufacturer regularly engaged in the production of such equipment. Manufacturer shall have at least 20-years of experience in manufacturing similar units for this type of applications. No subcontracting of tank fabrication shall be permitted.

Separator shall be fabricated, inspected, and tested for leakage before shipment from the factory by manufacturer as a completely assembled vessel (to the greatest extend possible with consideration to shipping requirements) ready for installation.

Separator shall be cylindrical, horizontal, atmospheric-type steel vessel intended for the separation and storage of flammable and combustible liquids. The separator shall have the structural strength to withstand static and dynamic hydraulic loading while empty and during operating conditions. The Oil/Water Separator’s dimensions and thickness shall be in strict compliance with Roark’s Formulas for Stress and Strain as presented in UL 58. Calculations, signed and stamped by a Registered Professional Engineer shall be submitted to document structural strength under specified overbearing or external pressure. A separator with a reduced shell thickness is not permissible.

Separator shall have the following oil storage capacities:

• High oil level (warning), equal to about 20% of the static vessel volume,

• High-high oil (alarm), equal to about 40% of the static vessel volume,

• Emergency oil spill capacity equal to about 80% of the static vessel volume.

Separator shall consist of inlet and outlet connections, non-clogging flow distributor and energy dissipater device, stationary under flow baffle, pre-settling area for solids, sludge baffle, oil coalescing chamber with removable parallel corrugated plates and sectionalized removable polypropylene impingement coalescers to optimize separation of free oil from water, effluent downcomer positioned to prevent discharge of free oil that has been separated from the water, large rectangular access way(s) for coalescers and each chamber, fittings for vent, oil pump-out, sampling, gauging, leak detection, and lifting lugs.

Separator Corrosion Control System shall be in strict accordance with Underwriters Laboratories Inc. Subject UL-1746 Standard for External Corrosion Protection Systems for Steel Underground Storage Tanks and High Guard External Corrosion Protection Specifications.

Description

The separator shall be a pre-packaged, pre-engineered, ready-to-install unit consisting of:

A 4-inch flanged influent connection with an internal influent nozzle at the inlet end of the separator. Nozzle discharge point will be located at the furthest diagonal point from the effluent discharge opening.

A velocity head diffusion baffle at the inlet to:

• reduce horizontal velocity and flow turbulence.

• distribute the flow equally over the separator’s cross-sectional area.

• direct the flow in a serpentine path to enhance hydraulic characteristics and fully utilize all separator volume.

• completely isolate all inlet turbulence from the separation chamber.

A sediment area to disperse flow and collect oily solids and sediments.

A sludge baffle to retain settleable solids and sediment and prevent them from entering the separation chamber.

An oil/water separation chamber containing removable inclined, parallel, flat/corrugated coalescer plates, sloped downward toward the sediment chamber, to:

• shorten the vertical distance than an oil globule must rise for effective removal. Minimum plate spacing to be 1-1/4".

• enhance coalescence by generating a slight sinusoidal (wave like) flow pattern thereby causing smaller, slow rising, oil globules to coalesce together on the undersides of the plates forming larger, rapidly rising sheets of oil.

• direct the paths of the separated oil to the surface of the separator.

and a sectionalized removable "Petro-Screen" polypropylene impingement coalescer designed to intercept oil globules of less than 20 microns in diameter. Heavy, one-piece impingement coalescers are not permissible.

Two, large rectangular easy Access manways complete with removable vapor tight cover, gasket, and corrosion-resistant bolts. Manways are designed to allow for maintenance and cleaning from grade level.

• Easy-Access manway(s) shall be placed over the plate pack and Petro-Screen to facilitate solids removal and provide access to the Corella® plate or like item and Petro-Screen coalescers for removal and maintenance.

An internal effluent downcomer pipe, located at the outlet end of the separator, to allow for effluent discharge from the bottom of the separation chamber only.

A 4-inch flanged effluent connection.

Two factory supplied saddles, seal welded to the OWS, located as shown on the drawing.

Fittings for vent, interface/level sensor, leak detection, waste oil pump-out, sampling, and gauge.

Lifting lugs at balancing points for handling and installation.

Identification plates: Plates to be affixed in prominent location and be durable and legible throughout equipment life.

Corrosion Protection System consisting of:

• External surfaces commercial grit blasted and coated with 75 mils .

• 10-year limited warranty

• Internal surfaces commercial grit blast and coated with minimum 15 mils DFT heavy-duty polyurethane.

Accessories & Options

• Separator shall be supplied with an audible and visual alarm system that indicates high oil level (visual only) and high-high oil level (audible and visual) of oil storage in the oil/water separator will be provided. A silence control shall be provided for the audible alarms. Level sensor(s) to be intrinsically safe. Level sensor floats to be made of stainless steel. The control panel shall contain both level sensor and leak detection control. The control panel shall be NEMA 4. Power to the control panel is to be [_240_] volt, [_3_] phase.

(Temporary plan until solar/ battery setup can be established)

• Separator shall be supplied with a freeze protection system, consisting of immersion heaters and insulation.

Heaters shall be sized to maintain 40ºF inside the insulated OWS, at a minimum ambient temperature of _5__ºF. Insulation shall consist of 2” thickness of closed cell foam, contained without a steel exterior wrap of steel. Insulation to provide a minimum R factor of R14.

• Separator shall be supplied with Deadman Anchoring System that includes polyester hold-down straps and concrete Deadman anchors.

• Electronically actuated valves

• Influent, Effluent and Oil Pumps

Quality Assurance

Submittals:

Shop Drawings: Shop drawings for oil/water separators shall show principal dimensions and location of all fittings.

Instructions: Separator installation, operation, and maintenance instructions must be made available.

Quality Control: Quality control, inspection procedures, shall be considered part of the submittal package.

Quality Control reports shall be available upon request after fabrication.

Warranty

The manufacturer shall warrant its products to be free from defects in material and workmanship for a period of one year from the date of shipment. The warranty shall be limited to repair or replacement of the defective part(s).

10-year limited warranty for external corrosion and structural defects.

Delivery instructions : Camp Dawson: 1001 Army Road, Kingwood WV 26537 Monday -Friday 8:00am - 3:00pm. Please give 24 hour notice of delivery.

Point of Contact: Christopher Loy 304-771-7156 (Primary) / Wayne Ritter 304-613-4992 (Alternate)