TM 10-5430-243-12&P 0005 000005 00-1 Change 1 – 28 April 2002OPERATOR AND UNIT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST) TANK, FABRIC, COLLAPSIBLE, WATER STORAGE, 20,000 AND 50,000 GALLONS OPERATION UNDER USUAL CONDITIONSSITING REQUIREMENTS WARNING The maximum permissible ground slope is one degree (three inch slope in 100 feet). Turbulence of water in the tank during filling or during high winds may cause the tank to roll and cause serious injury to personnel if placed on sloping ground. CAUTION Clear the area of sticks, stones, heavy vegetation, or any debris that may puncture or damage the tank fabric. 1. Site selection must consider where and in what configuration the water tank will be used within the water distribution system. Select a site in proximity of intended usage approximately 6 feet wider and longer than the flat empty tank size. For best operating condition, the selected site should be level but should never exceed 3 inches slope in 100 ft. If a level site cannot be obtained, the tank may be positioned with the lengthwise axis parallel to the slight slope with drainage in a downhill position. In those instances when the tank is positioned across the slope, it is important that the tank be stabilized against rolling. This can be accomplished by forming an earthen dike on the downhill side, or by means of smooth timbers or sand bags. A level spot or depression may be cut in the hillside to level the tank. 2. Prepare the site for installation. Avoid deep irregularities that will trap liquid. Clear the area of rocks, vegetation, or anything that could puncture or abrade the tank fabric. Fill all holes and depressions. Flatten and smooth ground surface. For the 50K tanks, an area 75 by 35 feet minimum is needed. 3. Select an area that will provide enough clearance to provide for a dike. A dike is used to stop the water flow in the event a rupture occurs. At least a five-foot perimeter around the empty tank is also needed for a service area. 4. If the tank is to be used on the site for a long period, a minimum of 4 inches of sand or soil should be put down before the tank is placed into position. 5. If the site has a slight slope, place the tank drain towards the lowest end. For best operation, the ground slope should be 3 inches in 100 feet, not to exceed one degree. NOTE When filling the tank on sloped ground, do not exceed the specified tank height. 6. Install the ground cloth over the installation site, if equipped and provided prior to receipt of tank.Do not exceed specified maximum full tank height
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