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c 0 A special air test procedure is required fort double-wall tanks that do not include factory, installed antifreeze. A special air test fixture is shipped with the tank. Fiberglass tanks must be pressurized and inspected for leaks using a soapy water solution. Leak testing prior to installation helps insure that fiber- glass tanks were not damaged in shipment. If the double-wall tanks are shipped with fac- tory -installed monitoring fluid, a simplified jobsite hydrostatic test procedure can be used. Installation for double-wall tanks is similar to the procedure for single-wall tanks. Fluid Containment requires pea gravel or crushed stone backfill material; pea gravel is a natu- rally rounded aggregate ranging from 1/8" to 314" diameter. Washed crushed stone (1/8" to 112" diameter) meeting ASTM C-33 may be used. Other backfill materials must not be used without consulting Fluid Containment for written approval. A mini- mum of 12" backfill bedding is required between the tank and the excavation bottom or concrete anchoring pad. Tanks must not be installed on timbers, beams or cradles. If tare Hydrostatic Tank Monitoring system is activated by filling at the jobsite, the tank cavity must be filled by pouring the liquid into the cavity. Depending on local climate, use tap water or an acceptable antifreeze mixture as the monitoring fluid. All tanks must be vented and are intended to be operated with fluid in the tank no high- er than the tank top. Fiberglass tanks are designed for operation at atmospheric pres- sure only, except when using vapor recovery systems, provided the pressure or vacuum does not exceed 1 psi maximum on the pri- mary tank. Overpressurizing of the primary tank will result in tank failure. The monitoring cavity between the inner and outer tank must be vented independently from the pri- mary tank. For additional details, request Underground Tank Installations (Fluid Containment Pub. No. 6304). Properly installed, fiberglass underground petroleum storage tanks can provide extended service in storing petrole- um products without corrosion -caused leaks and without maintenance. Fluid Containment maintains a listing of over 2,000 independent contractors who have received educational materials from Fluid Containment covering the proper installation of underground fiberglass tanks. On request, we can provide names of educated contractors. Double -Wall Fiberglass Tanks For Fuel Storage Model DWT -Type II Specification: Short Form The contractor shall provide U.L. labeled Model DWT -Type II double-wall fiberglass underground storage tanks in sizes and with fittings as shown on the drawings. The tanks shall be manufactured by Fluid Containment. Tanks shall be testedand installed with pea gravel or approved alternate backfill materi- al according to the current installation instructions (Fluid Containment Pub.No. 6304) provided with the tank. Long Form: Section 13200 Guide Specification Fluid Containment Double -Wall Fiberglass Reinforced Polyester Underground Storage Tanks Part i General 1.01 Related Work Specified In Other Sections A. Cast -in -Place Concrete: Section 03300 B. Anchor Botts: Section 05501 C. Plastic Pipe: Section 15064 D. Liquid Level Gauges: Section 15174 E. Other Related Work — such as Excavation and Boiler Equipment 1.02 Quality Assurance A. Acceptable Manufacturers: Fluid Containment, Houston, Texas. B. Governing Standards: 1. ASTM Specification D4021-86. Glass Fiber Reinforced Polyester Underground Petroleum Storage Tanks. 2. U.L. 1316. Underwriters Laboratories, Inc., Glass Fiber Reinforced Plastic Underground Storage Tanks for Petroleum Products. 3. National 'Fire Protection Assoc. (NFPA 30) Flammable and Combustible Liquids Code and (N FPA 31) Standards for Installation of Oil Burning Equipment. 4. General Services Administration, Public Building Service Guide Specification, PBS: 1568. 1.03 Submittals: A.Shop Drawings: Contractors shall sub- miii copies of shop drawings for each tank. Drawings shall include all critical dimensions and show locations of all fit- tings and accessories, i.e., manways, lad- ders, hold-down straps, heating coils, etc. Materials of construction shall be in accor- dance with Section 1.02 of this specifica- tion. B. Catalog Data: Contractor shall submit _ copies of manufacturer's literature. C. Certification Plate: U.L. labels shall be affixed to each tank. Installation Instructions: Contractors shall submit copies of manufacturer's latest installation instructions. E. Calibration Charts: Contractors shall sub- mit copies of manufacturer's latest cal- ibration charts. Part II Products 2.01 Double -Wall Fiberglass Underground Storage Tanks A. Loading Conditions — Tank shall meet the following design criteria: 1. External hydrostatic pressure: Buried in ground with 7' of over burden over the top of the tank, the hole fully flooded and safety factor of 5:1 against general buckling. 2. Surface loads: When installed according to manufacturer's installation instructions, tanks will withstand surface H-20 axle loads (32,000 lbs./axle). 3. Internal load: Primary and secondary tanks shall withstand 5 psi air pressure test with 5:1 safety factor. 4. Tanks shall be designed to support acces- sory equipment such as heating coils, ladders, drop tubes, etc. when installed according to manufacturer's recommendations and limita- tions. 5. Tank laminate shall include fillers. B. Product Storage Requirements: 1. All primary tanks must be vented. Tanks are designed for operation at atmospheric pressure only, except for use with vapor recovery sys- tems at a pressure or vacuum of approximately I psi. 2. Tanks shall be capable of storing liquids with specific gravity up to 1.1. 3. Maximum temperature: Tank shall be capa- ble of storing gasoline, alcohol blended gaso- line (with up to 100% methanol or ethanol), oxygenated fuels (up to 20% MTBE), av-gas, jet fuel, motor oil, (new or used), kerosene, diesel fuel or potable water at ambient under- ground temperatures not to exceed 150'F at the tank interior surface. 4. Tanks shall be chemically inert to petroleum products. C. Dimensional Requirements (refer to Fluid Containment literature on gallon- age): 1. Nominal capacity of the tank shall be gallons. 2. Nominal outside diameter of the tanks shall be feet. 3. Nominal overall length of the tanks shall be feet. D. Monitoring Capabilities: 1. Tanks shall have a space between the pri- mary and secondary shell walls to allow for the free flow and containment of all leaked product from the primary tank. 25