COMPLIANCE INFO_1999-2001 - Laserfiche WebLink

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Interior Dimensions in FIGURE 11-1 Tank Diameter 4' 6' 8' 10' 12' W 49-1/4" 73" 92" 121" 138-114" 'B' 54-112" 78" 98" 126" 1431/4" 'C' 48" 71-3/8" 91-3/16" 119-3/16" 136-5/8" 'D' 49-1/2" 72-3/4" 91-112" 120" 'E' 55" 77-314" 97-1/4" 125-3/4" — ' F' 48" 70-518" 90-50' 118.112" — 'G' 51-1/2" 75-1/8" 953/8" 123112" 'H' 56-518" 80-1/4" 100-112" 1285/8" 48" 71-3/8" 91-3/16" 119-3116" TABLE 11-1 11.2 EXTERNAL PIPING When pressure testing Me externa/ piping, the tank must be isolated from the interna/ piping system. The test pressures for external piping could cause tank failure, and result in death, serious personal injury or property damage. ♦ r r♦ r r ,♦r - r rr r r 11.3 VENTING TANK AWARNING All underground tanks/compartments must be vented to atmosphere for proper operations. Failure to vent could result in death, serious personal injury or property damage. 11.3.1. In the double-wall and triple -wall tank, the primary tank is designed to operate at atmospheric pressure. 11.3.2. The tank's venting system must be adequately sized to ensure that atmospheric pressure is maintained at all times, including during filling and emptying of tank. 11.3.3. Whenever installing overfill protection, such as alarms, automatic shut-off devices ("flapper valves") or vent -restriction devices ("ball -float valves"), follow the instructions provided by the manufacturer of the overfill -protection device and consult the authority having jurisdiction to determine the level at which the overfill protection should operate. F_ I WARNING Overfill protection, such as automatic shut-off devices or vent- res6iction devices, should not be installed if owner/operator will allow pump or pressure filling of the tank. Failure to follow this instruction could cause tank failure, and result in death, serious personal injury or property damage. 18 I U 11.4 VENTING INTERSTITIAL SPACE All reservoirs must be vented for proper operations. 11.4.1. When the tank's interstitial space is filled with a liquid, the space must be vented. It is sufficient to drill a 1/4 -inch - diameter hole in the side or cap of the reservoir riser pipe as supplied by the installer. If the groundwater level could be high enough to enter a drilled vent hole, install a vent line from the riser pipe to above high-water level. 11.4.2. When the interstitial space is dry, it is not necessary to vent the space to atmosphere. 12.1. GENERAL 12.1.1. Xerxes recommends only gravity filling of tanks. 12.1.2. See SECTION 18, Operating Guidelines. 13.1.GENERAL 13.1.1. Continue to take safety measures (such as placing barricades) around the excavation site until installation is completed. 13.1.2. When the tank has been set, tested and backfilled, and all piping and venting has been completed, add the balance of the backfill material. 13.1.3. The backfill must be free of debris, ice or snow. Any blocks or bricks used as support material during piping must be removed prior to completion of backfilling. 13.1.4. The backfill material specified in SECTION 4 must be used to completely fill excavation. 13.1.5. Be sure that the installation meets all of the require- ments of minimum cover as specified in SECTION 5. 13.1.6. When the tank has been backfilled to subgrade, take the final diameter reading (Deflection Reading "B" on the Tank Installation Checklist). 13.1.7. Complete the Tank Installation Checklist. 14.1. GENERAL 14.1.1. One method of taking the deflection measurements is the dipstick method described below. Similar methods can be used, such as a tape measure, etc.