Minneapolis Public Schools



SECTION 23 13 13GLASS FIBER-REINFORCED PLASTIC UNDERGROUND FUEL-OIL STORAGE TANKS - GENERALSUMMARYSection Includes: Include labor, materials, equipment, and accessories necessary to furnish and install double wall fiberglass fuel oil storage tanks, controls, and piping and make connections to oil burning equipment. Tank and pipe sizes shall be as shown on Drawings and specified.SUBMITTALSShop Drawings: Submit a portfolio showing fuel oil storage tanks, openings, dimensions, and related gauges, piping, and leak detection systems.QUALITY ASSURANCERegulatory Requirements:State Building CodeNational Electric CodePlumbing CodeLocal Codes and Ordinances - PRODUCTSMANUFACTURERSAcceptable Manufacturers for Double Wall Fiberglass Underground Fuel Oil Tanks: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:Fluid Containment, Inc.XerxesAcceptable Manufacturers for Tank Monitoring And Leak Detection Systems: Tank monitoring and leak detection systems, featuring inventory control, in-tank leak detection, interstitial leak detection, containment sump sensing, and over-fill alarm shall be subject to compliance with requirements of the Contract Documents; acceptable manufacturers are as follows:OPWDOUBLE WALL FIBERGLASS UNDERGROUND FUEL OIL TANKSGeneral Requirements:Materials: Tanks shall be manufactured of fiberglass reinforced plastic using polyester resins with glass fiber reinforcement.Annular Space: Tank shall have a space between primary and secondary shell walls to allow for free flow and containment of leaked products from the primary tank.Strike Plate: Primary storage tank shall have deflector plates located directly below openings into tank. Deflector plates shall be of fiberglass resin to be an integral part of tank shell.Tank Capacity: Tank shall have a capacity of 10,000 gallons with the diameter and length indicated on Drawings.Loading Conditions: Tanks shall meet the following design criteria:External Hydrostatic Pressure: Buried in ground with 7 feet of overburden over top of tank. Hole fully flooded and a safety factor of 2 to 1 against general buckling.Surface Loads: When installed in accordance with manufacturer's installation instructions, tanks shall withstand surface H-20 axle loads (32,000 pounds per axle).Internal Load: Primary tank and annular space shall withstand independent pressure test of 5 psi on tanks of 4-foot through 10-foot diameters, resulting in a 5 to 1 safety factor.Design tanks to support accessory equipment, including heating coils, ladders, drop tubes, and piping sumps when installed in accordance with manufacturer's recommendations and limitations.Product Storage Requirements: Tanks shall be designed for operation at atmospheric pressure and, therefore, shall be vented.Tanks shall be capable of storing liquids with specific gravity up to 1.1.Tanks shall be capable of storing fuel oil at temperatures not to exceed 150 degrees F at tank interior surface.Tanks shall be chemically inert to petroleum products.Tank Openings: Tank shall have:(1) Manways With a 22-Inch Minimum Inside Diameter(1) 4-Inch Fill Line(1) 3-Inch Vent/Sounding Line Combination(1) 4-Inch Interstitial Liquid Sensor RiserManway Covers: Manway covers shall be provided with flanges for an oil level probe.Manway Risers: Each of the (2) risers shall be 42-inch minimum inside diameter.Lid inside diameter shall be a minimum of 1 inch larger than the outside diameter of the manway cover.Fittings and Connections:Threaded fittings on UL labeled tanks for the storage of petroleum products shall be of a material of construction consistent with requirements of UL label. Supply fittings with threaded plugs.Standard threaded fittings shall be 4 inches in diameter and shall be half couplings. Reducers shall be used for smaller sizes, where specified, and shall be provided by Contractor.Thread Standards: Threaded fittings shall have machine tolerances in accordance with ANSI Standards for each fitting size.Strength: NPT fittings shall withstand a minimum of 150 foot-pounds of torque and 1,000 foot-pounds of bending, both with 2 to 1 factor of safety.Provide (1) McDonald Model 882, or Owner approved equal, 3-inch sounding line cap suitable for padlocking.Provide (1) Morrison Brothers Company No. 155, or Owner approved equal, 3-inch double outlet vent cap with stainless steel screens and threaded connection.Provide waterproof couplings for conduit and piping penetrations of the fiberglass manway riser.Couplings for fiberglass containment piping shall be FRP (fiberglass reinforced plastic) type.Provide swing joints on the oil supply, oil return, and vent piping to minimize strain on piping caused by tank settlement.Provide Preferred Utilities, or Owner approved equal, fusible link syphon breaker at high point in fuel oil suction line in Boiler Room.Tank Tappings and Related Pipe Sizes: Service Tappings RFP Pipe Vent/Sounding 4-Inch 3-Inch Fill 6-Inch 4-Inch Annular Space 4-Inch 4-InchRefer to Drawings for locations. Provide reducer bushings as required.Fuel oil fiberglass fill tube shall screw into bottom of a double tapped 6 by 4 reducer bushing inserted into a standard 6-inch NPT half coupling and terminate 6 inches from bottom of tank with a 45-degree chamfer.ACCESSORIESLifting Lugs: Provide lifting lugs on tank. Lugs shall be capable of withstanding weight of tank with a safety factor of 3.Hold-Down Straps: Provide glass fiber-reinforced plastic anchor straps as supplied by tank manufacturer. Number and location of straps shall be as specified by manufacturer. Straps shall be capable of withstanding buoyancy load for tank diameter.Certification Plate: UL label shall be permanently affixed to tank.Fill Cap and Spill Containment Vessel:Fill cap shall be McDonald Model 267-C, or Owner approved equal, 4-inch Almag 35 aluminum cap with a spring loaded brass locking latch. Latch shall have provisions for padlocking.Spill containment vessel shall be Flex Catch Model 705556112BLK, below grade, 25-gallon recovery vessel, as manufactured by EBW, Inc., or Owner approved equal. Vessels shall include an 30-inch round access manhole with fiberglass lid, a light weight aluminum cover, cast iron attachment ring, cast iron base, and a cement and gravel guard around bellows:Cast iron base shall be screwed onto fill pipe from tank and a fill pipe extension with lockable fill cap shall be installed inside the bellows chamber.Manholes: Manholes above manway risers shall be Neenah Foundry Company No. R-1740-D large manhole frame and solid lid, or Owner approved equal.Street Box: Street box for 3-inch sounding line and for 4-inch interstitial sensing riser shall be OPW-AOW, 12-inch diameter by 12-inch long skirt observation manhole with steel skirt and cast iron body and cover, as manufactured by Dover Corporation/OPW Division, or Owner approved equal.Fill Tubes:Tubes shall be fiberglass reinforced plastic.Tubes shall be factory installed, 4-inch diameter, and shall include a 6-inch steel fitting with a double tapped reducer bushing to 4-inch diameter.Tubes shall be standard items as manufactured and installed by tank manufacturer.FRP fill tubes shall be supplied by Fluid Containment, or Owner approved equal. Refer to Drawings for location.Provide oil tank measuring stick and chart.Filter Fabric: Filter fabric shall be utilized to prevent migration of backfill material with native soil and maintain integrity and stability of backfill material.Suitable brand name filter fabrics are itemized below. Local filter fabric distributors can be identified by calling the phone numbers listed.Manufacturer: DuPontProduct:TYPAR 3401 or TYPAR 3341Telephone:(800) 441-9475Manufacturer: Hoechst FibersProduct:TREVIRA S1120 (Hole Depth Less Than 10 Feet Deep) TREVIRA S1127 (Hole Depth Greater Than 10 Feet Deep)Telephone: (800) 845-7597Manufacturer: Phillips FibersProduct: SUPAC 4NPTelephone: (800) 845-5737TANK MONITORING AND LEAK DETECTION SYSTEMSHardware:Provide a wall mounted console with the following:A 2-line, 24-character, liquid crystal display for on-site viewing of inventory, leak detection, and alarm information.A 24-button, front panel keyboard with control and alpha-numeric functions for programming, operating, and reporting.Three (3) front panel LED's to provide a visual indication of power-on, warning, and alarm conditions.An internal, audible warning and alarm indicator.Intrinsically safe.UL listed.*****Note to Specifier: Select one of the following *****An integral report printer with built-in take-up spool for hard copy documentation of inventory, leak detect, and alarm information.A standard RS-232 communications interface module providing data transmission to a computer and printing device.***** End *****A 4-relay output module programmable to alarm limits and capable of actuating external alarm devices.A 4-input in-tank probe module (maximum of 2 modules per console) compatible with standard capacitance probes or magnetostrictive probes.An 8-input sensor module compatible with sump float switch sensor and interstitial sensor.Oil level probe shall be a Series 8473, or Owner approved equal. Magnetostrictive inventory/leak test probe capable of utilizing standard gas and oil resistant wire between 14 AWG and 18 AWG for field connections. Provide a 4-inch probe riser cap and ring kit.No more than (2) wires between the probe and control console.Leak detection capability of 0.1 gph.Third-party certification in accordance with U.S. EPA's "Volumetric Tank Tightness Testing Method".Suitable for No. 5 and lighter fuel oil.Sump sensor switch shall be a Series 7943, or Owner approved equal, single-cable float switch sensor capable of detecting the presence of liquid in the containment sump. Sensor shall be capable of utilizing standard gas and oil resistant stranded wire.No more than (3) wires between sensor and control module.Overfill alarm shall be a Series 7900, or Owner approved equal, alarm relay capable of detecting an overfill condition and activate an alarm horn and light.One (1) alarm shall be located outside near oil tank and shall be equipped with an Alarm Acknowledgment Switch so that fuel oil delivery personnel are required to deactivate alarm.One (1) alarm shall be located at the TLS-350 console.Alarm shall activate when fuel oil tank is 95 percent full.Interstitial sensor shall be a Series 7943, or Owner approved equal, single-cable float switch sensor capable of detecting the presence of liquid in the annulus of double-wall tanks. Provide a 2-inch interstitial sensor Riser Cap and Adapter Kit. Sensor shall be capable of utilizing standard gas and oil resistant stranded wire.No more than (2) wires between sensor and control console.Operating Capabilities:Unit shall be capable of monitoring inventory (oil level) and produce a combination of automatic and manual reports which shall include the following information:Fuel VolumeFuel WeightFuel TemperatureTemperature Compensated Fuel VolumeLast Inventory Increase AmountLast In-Tank Leak Test ResultTime and DateFuel IdentificationThe ability to perform both automatic and manually activated leak detection tests, in accordance with Federal EPA Regulations 40 CFR, Part 280, which includes a leak analysis report.The ability to monitor up to (64) interstitial areas or containment puter formatted and printing terminal formatted reports.Programmable automatic report times.Programmable alarm limits to warn of:LeaksOverfillsLow InventorySystem shall be capable of the following performance specifications in a 10,000-gallon tank:Relative Height of Fuel, Plus or Minus 0.1 InchesRelative Volume of Fuel, Plus or Minus 15 GallonsFuel Temperature, Plus or Minus 1.5 Degrees FTime, Plus or Minus 1 Minute Per MonthLeak Detection Rate of 0.1 GPH or GreaterStore in memory at least (10) delivery reports per tank.Provide alarm history reports on demand, locally or remotely.Provide a flexible console profile set-up with U.S. or metric measurements. - EXECUTIONPERMITSPermits, Fees, and Notices: Contractor shall contact State and local Fire Marshals, obtain required permits, and pay fees necessary for the installation of fuel oil tank(s) and piping connections to boilers and other fuel burning apparatus.INSTALLATION INSTRUCTIONSGeneral Requirements: Install fiberglass underground tank(s) in accordance with Fluid Containment, Inc. installation instructions.Installation is related to the procedure for steel tanks, following NFPA 30 and 31 practices. However, backfill shall be washed pea gravel type material, a naturally rounded aggregate 1/4-inch nominal size, ranging from 1/8-inch to 3/4-inch diameter.If pea gravel is not available in a specific area, washed stone crushings 1/8-inch to 1/2-inch diameter, meeting requirements of ASTM C33, may be used with satisfactory results. Other backfill materials shall not be used without consulting Owens-Corning Fiberglass.Excavation: Tank excavation shall be free from material that may cause damage to tank. Care shall be taken during installation that foreign matter is not introduced into excavation or backfill. Bottom of the excavation shall be hand leveled.Hold Down Pad: Provide concrete hold down pad as shown on Drawings. Tank(s) shall be separated from concrete slabs by at least 1 foot of washed pea gravel.Concrete pad shall be 12 inches thick and shall extend 12 inches beyond tank in all directions. Reinforce pad with two mats of No. 5 reinforcing bars, 12 inches on center in both directions.Tank Placement: Prior to placing tank in excavation, foreign matter shall be cleaned from tank. Equipment to lift tank shall be of adequate size to lift and lower tank without dragging and dropping to ensure no damage to tank. Tank shall be carefully lifted and lowered by use of cables or chains attached to lifting lugs in accordance with manufacturer's recommendations. Under no circumstances shall chains or sling be used around tank shell.Line sides and bottom of excavation with filter fabric. Overlap adjoining fabric panels a minimum of 12 inches. Place backfill on top of filter fabric in and around excavation perimeter to hold fabric in place.Hold-down pads shall be set and covered with 1 foot of backfill prior to placement of tank.Hold-Down Straps: Hold-down straps shall be fiberglass (FRP) and shall be of quantity and location recommended by tank manufacturer.Backfill: Place backfill, consisting of pea gravel, along bottom sides of tank by hand shoveling and tamping to ensure that tank is fully and evenly supported around bottom quadrant.Backfill shall be deposited carefully around tank and to a 12-inch depth over tank to avoid damage to tank.Tamp backfill to 90 percent Standard Proctor Density.Install a second layer of filter fabric 1 foot above tank. Backfill above this layer shall be similar to material excavated, but shall be clean of foreign matter or material that may puncture fabric.Tamp backfill to 98 percent Standard Proctor Density.Concrete Slab on Grade: Provide a 10-inch thick mesh reinforced concrete slab around manholes and street boxes. Slabs shall extend to a minimum of 1 foot beyond manholes and boxes. Top of slab shall be 1 inch above finished grade or sod.FUEL OIL PIPINGInstallation: Install fuel oil supply, return, fill, and vent piping on undisturbed or compacted fill as specified. Refer to Section 23 11 13, Facility Fuel-Oil Piping.FIELD QUALITY CONTROLAbove Ground Pressure Test: An air test of tank(s) above ground is required. Pressure shall not exceed 5 psig, as measured at top of tank, while a soap bubble solution is applied to seams and fittings.Below Ground Pressure Test: Before backfilling, a final air test shall be made. Pressure shall not exceed 5 psig, as measured at top of tank, while a soap bubble solution is again applied to seams and fittings.TANK MONITORING SYSTEM INSTALLATION:General Requirements:Install the tank monitoring system, probes, shielded cable, and controller in strict accordance with the manufacturer's written installation instructions.Factory trained and approved personnel shall make final operational checks, final adjustments, and instruct the school operating and maintenance personnel.ELECTRICAL WORK FOR OIL PUMPS:General Installation Requirements:All power and control wiring and connections required for tank accessories shall be provided by the Mechanical Contractor.Raceways shall be galvanized steel EMT and exposed through unfinished spaces. Raceways shall be installed in a workmanlike manner, rigidly supported, and square with the building construction.Pull boxes shall be installed in long runs where necessary to facilitate pulling wires. Expansion fittings shall be furnished and installed where conduits run through building expansion joints, these to be O.Z. Type AX, or approved equivalent. Follow manufacturer's instruction as to installation of the joints.Conductors shall be carefully handled and installed in accordance with manufacturer's directions.END OF SECTION 23 13 13 ................
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