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11 Fiberglas Hold-down Straps Fiberglas hold-down straps are available for all tanks. These straps are pre-shaped to the contour of the tank ribs. The strap length is shown in the following table. Installation FIBERGLAS UNDERGROUND TANKS MUST BE INSTALLED Model Tank Diameter Strap Length IN ACCORDANCE WITH THE INSTALLATION INSTRUCTIONS D-5 4' 7' 3-1/2" (Owens-Corning Fiberglas publication 3-PE-6304). This D-6 6' 9' 10" document should be a part of your tank specifications. Some G-6 8' 14' 10" key installation steps are set forth below. For additional steps, D-3, 10' 18' see the installation instructions. D-3, D-6 12' 20' 4" Fiberglas tanks must be pressure tested to 5 psi on tanks of 4' Strap width 1 3/8" through 10' diameters and to 3 psi on tanks of 12' diameters, with fittings soaped, before installation. Pressure testing helps Number Number insure that Fiberglas tanks were not damaged in transit. Gallon Straps Gallon Straps Installation is similar to the procedure for steel tanks. The dif- Capacity Required Capacity Required ference is backfill. Owens-Corning requires washed pea gravel 550, 1000 2 25,000 8 type material—a naturally-rounded aggregate 1/4" nominal 2,000, 4,000, 6,000 2 30,000 10 size, ranging from 1/8" to 3/4" diameter. 6,000 D-6, 8,000,10,000 4 40,000 12 12,000, 15,000 4 48,000 (D-3) 16 If pea gravel is not available, washed stone crushings 20,000 6 1/8"-1/2" diameter, meeting ASTM C-33 may be used. Other backfill materials must not be used without consulting Owens- Guides located on the strap secure strap over rib. Guides Corning Fiberglas for written approval. located on top of the strap accommodate cables used in Tanks must not be installed on timbers, beams or cradles. A deadman-type anchoring procedures. Black arrows on tank minimum 12" approved backfill bed is required between the wall No. -4 identify ribs on which hold-down straps must be tank and hole bottom or concrete pad. installed, if required. (See pages 4 through 10 for strap t (� locations.) Do not use straps or cables between ribs on tanks. Adequate backfill support is essential to the performance o• a Fiberglas tank. Over 100,000 installations have shown that The anchor points on a four foot diameter tank should not be pea gravel or crushed stone provides the necessary founda- less than 5' apart; on a six foot diameter tank should not be tion support when pushed under tank ends and sides. less than 8' apart; on an eight foot diameter tank not less than 10' apart; on a ten foot diameter tank not less than 12' apart; Correctly installed, Owens-Corning Fiberglas underground and on a twelve foot diameter tank not less than 14' apart. petroleum storage tanks mean virtually unlimited service in Anchor points, turnbuckles and cable clamps are not supplied. storing petroleum products. Without corrosion caused leaks. Without maintenance. And at less cost over the life of your storage system than with steel tanks. All tanks must be vented, as tanks are designed for opera- tion at atmospheric pressure only, except for use with vapor recovery systems provided the pressure or vacuum radius does not exceed 1 psi. Hole Lining 12" pea gravel It is the responsibility of the tank owner or his technical backfill bed-use representative to determine if local soil conditions require that same material to backfin special measures be taken. Our experience indicates that if all the other installation instructions are carefully followed, the use of filter fabric is not essential. Filter fabric prevents the migration of pea gravel with native - concrete pad soil; it helps to maintain the integrity and stability of the backfill material. Owens-Corning recommends the use of filter fabric for the following types of installations: Minimums per anchor location 1. Tidal conditions or areas subjected to frequently changing P ground water levels. Tank Diameter 6' or less 8' or more 2. Unstable soils (muck or landfills) Wire rope (recommended 6 x 19 improved plow steel) Diameter 3/8" 1/2" 3. Water conditions with silty soil Turnbuckle diameter Polyethelene liners are not considered an effective material. Hook Type 3/4" 1-1/4° Consult your Owens-Corning Representative for filter fabric Jaw or Eye Type 1/2" 3/4" recommendations and use. I