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Interior 11.4 VENTING INTERSTITIAL SPACE Dimensions Tank Diameter in FIGURE ACAUTION 11-1 4' 6' 8' 10' 12' All reservoirs must be vented for proper operations. W 491/4" 73" 97 121" 138-1/4" °B° 54-117 78" 98" 126" 143-1/4" 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 114-inch- 'C° 48 71 3/8" 913/16" 1193/16" 136 /8" diameter hole in the side or cap of the reservoir riser pipe as °D° 49-1/7 72-314" 91-112" 120" — supplied by the installer.If the groundwater level could be high 'E' 55" 77-3/4" 97-114" 125-3/4" — enough to enter a drilled vent hole,install a vent line from the °F° 48" 70-5/8" 90-5/8" 118-112" — riser pipe to above high-water level. "G" 51-112" 75-118" 95-318" 123-117 — 11.4.2.When the interstitial space is dry, it is not necessary to ®H" 56-518" 80-1/4" 100-1/7 128-5/8" — vent the space to atmosphere. "1" 48" 71-318" 91-3/16" 119-3/16" — TABLE 11-1 12.1. GENERAL 11.2 EXTERNAL PIPING 12.1.1.Xerxes recommends only gravity filling of tanks. WARNINGI TL When pressure testing the externa/piping,the tank must be 12.1.2. See SECTION 18, Operating Guidelines. isolated from the internal piping system. The test pressures for externa/piping could cause tank failure,and result in death, • '' serious personal injury or property damage. 13.1. GENERAL 13.1.1.Continue to take safety measures(such as placing ACAUTION barricades)around the excavation site until installation is When extending monitoring or vapor-recovery piping to the completed. surface, make sure the at-grade fittings are different from any fill fittings and will not accept standard fill hoses. 13.1.2.When the tank has been set,tested and backfilled,and all piping and venting has been completed,add the balance of 11.3 VENTING TANK the backfill material. AWARNING 13.1.3.The backfill must be free of debris,ice or snow.Any All underground tanks/compartments must be vented to blocks or bricks used as support material during piping must be atmosphere for proper operations. Failure to vent could removed prior to completion of backfilling. result in death, serious personal injury or property damage. 13.1.4.The backfill material specified in SECTION 4 must be 11.3.1. In the double-wall and triple-wall tank,the primary tank is used to completely fill excavation. designed to operate at atmospheric pressure. 13.1.5.Be sure that the installation meets all of the require- 11.3.2.The tank's venting system must be adequately sized to ments of minimum cover as specified in SECTION 5. ensure that atmospheric pressure is maintained at all times, including during filling and emptying of tank. 13.1.6.When the tank has been backfilled to subgrade,take the final diameter reading(Deflection Reading"B"on the Tank 11.3.3.Whenever installing overfill protection,such as alarms, Installation Checklist). automatic shut-off devices("flapper valves")or vent-restriction devices("ball-float valves"),follow the instructions provided by 13.1.7. Complete the Tank Installation Checklist. the manufacturer of the overfill-protection device and consult the authority having jurisdiction to determine the level at which ® • the overfill protection should operate. 14.1. GENERAL AWARNING 14.1.1.One method of taking the deflection measurements is Overfill protection,such as automatic shut-off devices or vent- the dipstick method described below.Similar methods can be restriction devices, should not be installed if owner/operator used,such as a tape measure,etc. 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