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. 1 1 WARNING:All internal piping must beat least 4•'(6"for 12'diame- If the tank has a sump or a bottom fitting,take extra care that the ter tanks)from the tank bottom. tank does not rest on it prior to installation. Refer to Figure 91 and Table 91 to determine the correct dimen- During installation,provide a clear area in the bedding material,so sions to size internal pumps and piping. that the tank rests on the bedding and the sump or bottom fitting is clear.After setting the tank,fill and tamp the resulting void by hand When the tanks interstitial space is filled with a liquid,the space before continuing the backfilling. must be vented.It is sufficient to drill a 1/4"-diameter hole in the side or cap of the monitor system riser pipe.When the ground- ; , I GROW water level will be high enough to enter a drilled vent hole,install a separate vent line from the riser pipe to above grade level. When the tank has been set,tested and backfilled,and all piping When the interstitial space is dry,it is not necessary to vent the and y be has added. been completed,the balance of the backfill material space to atmosphere. It is the installers responsibility to select a thread sealant that is When the tank has been backfilled to subgrade,take the final compatible with the product being stored.Some sealants cannot diameter reading(Deflection reading"B",on the checklist). be used with some products.if necessary,remove,clean and The same material as specked in Section 3 must be used to redope all plugs. completely fill excavation.The backfill must be free of debris.Any blocks or bricks used as support material during piping must be BBEM removed prior to completion of backfilling.Safety measures,such —A B D 6 as placing barricades until installation is complete;should be used DIMENSION LINE DETAIL DIMENSION LINE DETAIL around the excavation site. SINGLE WALL 8 DOUBLE WALL 11 DOUBLE MALL I SCALE, 1/16 SCALE, 1/16 Be sure that the installation meets all of the requirements of minimum cover as specified in Section 4. a-D Be sure that the checklist is properly completed. '1' 1 1 SINGLE WALL DOUBLE NALL ❑ DOUBLE WALL I DIPSTICK PREPARATION RIBBED OUTER MALL SMOOTH OUTER WALL Drive a small-headed,non-sparking(e.g. brass)nail into a wooden NOTE, 1 - ALL FITTING DIMENSIONS ARE MEASURED FROM TME TOP OF A dipstick at the 1"mark. SERVIICEE GAWENG TO THE INSIDE,BOTTOM OF TIE TANK AND FIRST DIAMETER READING MCLUD2 - IHTERIOR DIAMETERS DO NOT INCLUDE GAUGE PLATE CLEARANCE. 1. Place the dipstick into a service fitting. FIGURE 91 2. Measure and record the distance from the tank bottom to the top of the fitting. 3. Pull the dipstick up until the nail catches on the inside top TABLE 91 of the tank. INTERIOR DIMENSIONS(IN) 4. Measure the distance from the tank top(inside)to the top TANK of the fitting.Subtract 1"from this measurement and record DUL "A" "B" 148.0D "E" "F" "D» "R" "I° the distance. 4, 4950 5450 51.5D 56.625 48.90 5. Subtract the second distance from the first and recordthis value as reading'X on the Installation Checklist. 6' 73.00 78.00 77..75 70.625 75.125 8025 71.36SECOND DIAMETER READING 8' 93.00 98.00 97.75 90.625 95.375 100.50 91.188 1. Place the dipstick into a service fitting with a riser installed W' 121.00 126.00 125.75 118.50 123.50 28.625 119.16 to subgrade. 12' 138.25 143.25 2. Measure and record the distance from the tank bottom to the top of the standpipe. 3. Pull the dipstick up until the nail catches on the inside top of All piping must conform to all applicable codes and standards.See the tank. INTRODUCTION. 4. Measure the distance from the tank top(inside)to the top of WARNING:When pressure testing the piping,the tank must be the standpipe.Subtract 1'from this measurement and record isolated from the piping system.The test pressures for piping the distance. may cause the tankto explode and cause death,severe personal 5. Subtract the second distance from the first and record this injury or property damage. value as reading"B"on the Installation Checklist. CAUTION:When extending monitoring or vapor recovery piping to the surface,be sure that the at-grade fddngs are different from any fill filings and will not accept standard fill hoses.