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v <br />n <br />(1/8" to 1/2" diameter) meeting ASTM C-33 <br />may be used. Other backfill materials must <br />not be used without consulting Fluid <br />Containment for written approval. A minimum <br />of 12" backfill bedding is required between <br />the tank and the excavation bottom or con- <br />crete anchoring pad. Tanks must not be <br />installed on timbers, beams or cradles. <br />If the Hydrostatic Tank Monitoring system <br />is activated by filling at the jobsite, the tank <br />cavity must be filled by pouring the liquid into <br />the cavity. Depending on local climate, use <br />tap water or an acceptable antifreeze mixture <br />as the monitoring fluid. <br />All tanks must be vented and are intended <br />to be operated with fluid in the tank no higher <br />than the tank top. Fiberglass tanks are <br />designed for operation at atmospheric <br />pressure only, except when using vapor <br />recovery systems, provided the pressure <br />or vacuum does not exceed 1 psi maximum <br />on the primary tank. Overpressurizing of the <br />primary tank will result in tank failure. The <br />monitoring cavity between the inner and outer <br />tank must be vented independently from the <br />primary tank. <br />For additional details, request Underground <br />Tank Installations (Fluid Containment Pub. <br />No. INST 6001). Properly installed, fiberglass <br />underground petroleum storage tanks can <br />provide extended service in storing petroleum <br />products without corrosion -caused leaks and <br />without maintenance. <br />Fluid Containment maintains a listing of <br />over 2,000 independent contractors who have <br />received educational materials from Fluid <br />Containment covering the proper <br />installation of underground fiberglass tanks. <br />On request, we can provide names of <br />educated contractors. <br />Double -Wall Fiberglass Tanks For <br />Fuel Storage Model DWT -Type II <br />Specification: Short Form <br />Auto -cad drawings are available through your <br />local sales representative. <br />The contractor shall provide U.L. labeled <br />Model DWT -Type II double-wall fiberglass <br />underground storage tanks in sizes and with <br />fittings as shown on the drawings. The tanks <br />shall be manufactured by Fluid Containment. <br />Tanks shall be tested and installed with <br />pea gravel or approved alternate backfill <br />material according to the current installation <br />instructions (Fluid Containment Pub. No. <br />INST 6001) provided with the tank. <br />Long Form: Section 13200 Guide <br />Specification Fluid Containment <br />Double -Wall Fiberglass Reinforced <br />Polyester Underground Storage <br />Tanks <br />Auto -cad drawings are available through your <br />local sales representative. <br />Part I General <br />1.01 Related Work Specified <br />In Other Sections <br />A. Cast -in -Place Concrete: Section 03300 <br />B. Anchor Bolts: Section 05501 <br />C. Plastic Pipe: Section 15064 B. <br />D. Liquid Level Gauges: Section 15174 <br />E. Other Related Work — such as <br />Excavation and Boiler Equipment <br />1.02 Quality Assurance <br />A. Acceptable Manufacturers: <br />Fluid Containment, Conroe, Texas. <br />B. Governing Standards: <br />1. ASTM Specification D4021. <br />Glass Fiber Reinforced Polyester <br />Underground Petroleum Storage <br />Tanks. <br />2. U.L. 1316. Underwriters Laboratories, <br />Inc., Glass Fiber Reinforced Plastic <br />Underground Storage Tanks for <br />Petroleum Products. <br />3. National Fire Protection Assoc. <br />(NFPA 30) Flammable and <br />Combustible Liquids Code and (NFPA <br />31) Standards for Installation of Oil <br />Burning Equipment. <br />4. General Services Administration, <br />Public Building Service Guide <br />Specification, PBS: 1568. <br />1.03 Submittals: <br />A. Shop Drawings: Contractors shall <br />submit copies of shop drawings <br />for each tank. Drawings shall include all <br />critical dimensions and show locations <br />of all fittings and accessories, i.e., <br />manways, ladders, hold-down straps, <br />heating coils, etc. Materials of construction <br />shall be in accordance with Section 1.02 <br />of this specification. <br />B. Catalog Data: Contractor shall submit <br />copies of manufacturer's literature. <br />C. Certification Plate: U.L. labels shall be <br />affixed to each tank. <br />D. Installation Instructions: Contractors <br />shall submit copies of manufactur- <br />er's latest installation instructions. <br />E. Calibration Charts: Contractors shall <br />submit copies of manufacturer's latest <br />calibration charts. <br />Part 11 Products <br />2.01 Double -Wall Fiberglass Underground <br />Storage Tanks <br />A. Loading Conditions —Tank shall meet <br />the following design criteria: <br />1. External hydrostatic pressure: Buried <br />in ground with 7' of over burden over <br />the top of the tank, the hole fully <br />flooded and safety factor of 5:1 <br />against general buckling. <br />2. Surface loads: When installed accord- <br />ing to manufacturer's <br />installation instructions, tanks will <br />withstand surface H-20 axle loads <br />(32,000 lbs./axle). <br />3. Internal load: Primary and secondary <br />tanks shall withstand 5 psi air <br />pressure test with 5:1 safety factor. <br />4. Tanks shall be designed to support <br />accessory equipment such as heating <br />coils, ladders, drop tubes, etc. when <br />installed according to manufacturer's <br />recommendations and limitations. <br />5. Tank laminate shall include silica <br />C. <br />A <br />treated with silane. <br />Product Storage Requirements: <br />1. All primary tanks must be vented. <br />Tanks are designed for operation at <br />atmospheric pressure only, except for <br />use with vapor recovery systems at a <br />pressure or vacuum of approximately <br />1 psi. <br />2. Tanks shall be capable of storing <br />liquids with specific gravity up to 1.1. <br />3. Maximum temperature: Tank shall be <br />capable of storing gasoline, alcohol <br />blended gasoline (with up to 100% <br />methanol or ethanol), oxygenated <br />fuels (up to 20% MTBE), av-gas, <br />jet fuel, motor oil, (new or used), <br />kerosene, diesel fuel or potable <br />water at ambient underground <br />temperatures not to exceed 150°F <br />at the tank interior surface. <br />4. Tanks shall be chemically inert to <br />petroleum products. <br />Dimensional Requirements <br />(refer to Fluid Containment literature <br />on gallonage): <br />1. Nominal capacity of the tank shall be <br />gallons. <br />2. Nominal outside diameter of the tanks <br />shall be feet. <br />3. Nominal overall length of the tanks <br />shall be feet. <br />Monitoring Capabilities: <br />1. Tanks shall have a space between <br />the primary and secondary shell <br />walls to allow for the free flow and <br />containment of all leaked product <br />from the primary tank. <br />2. The following continuous monitoring <br />conditions shall be compatible with <br />the cavity between the inner and <br />outer tanks: <br />• Vented to atmosphere <br />• Vacuum — 5 psi maximum <br />• Positive air pressure (5 psi maximum) <br />• External hydrostatic pressure -- 7' <br />maximum groundwater head <br />pressure over tank top. <br />3. Tanks 6' diameter and larger shall <br />have an integrally mounted reservoir" <br />installed on the tank for optional <br />hydrostatic monitoring. The reservoir <br />shall be constructed of fiberglass <br />reinforced plastic materials and <br />warranted for 30 years against failure <br />due to internal/external corrosion and, <br />when properly installed, against struc- <br />tural failure (same as tank warranty). <br />'Tanks 4' diameter DWT -6 Type II tanks <br />do not include a fiberglass reservoir. A <br />4" diameter riser pipe screwed into the <br />4" diameter annular space fitting,will <br />serve as the reservoir. <br />4. Tank shall be designed with one 4" <br />fitting that will access the tank bottom <br />between the primary and secondary <br />walls (annular space). <br />5. The double-wall tank monitor shall <br />be capable of detecting a breach in <br />the inner and/or outer tank under the <br />following installed conditions: <br />a. When the inner tank is empty. <br />b. When the inner tank is partially <br />33 <br />