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11 10. PIPING AND VENTING DWARNING: All Internal piping must be at least 41nch 16 inch for 12 foot diameter tanks] from the tank bottom. 0 CAUTION: All single wall and double wall tanks must be vented to atmospheric pressure. Refer to Figure 10-1 and Table 10-1 to determine the correct dimensions to size internal pumps and piping. 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 riser pipe as supplied by the installer. When the groundwater level will be high enough to enter a drilled vent hole, install a vent line from the riser pipe to above grade level. When the interstitial space is dry, it is not necessary to vent the space to atmosphere. It is the installer's responsibility to select a thread sealant that is compatible with the product being stored. Some sealants cannot be used with some products. If necessary, remove, clean and redope all plugs. 81E�TM N AtD V- G DIMENSION LINE DETAIL DIMENSION LINE DETAIL SINGLE WALL t DOUBLE WALL If DOUBLE WALL i .C. ,A, B• .F. ,D, E• .1. .G. N. SINGLE WALL DOUBLE WALL -11 DOUBLE WALL -I RIBBED OUTER WALL SMOOTH OUTER MALL NO' 1 - ALL FITTING DIMENSIONS ARE MEASURED FROM THE TOR OF A SERVICE FITTING TO THE INSIDE BOTTOM OF THE TALK AND INCLUOE GAUGE PLATE CLEARANCE. 1 -INTERIOR DIAMETERS DO NOT INCLUDE GAUGE PLATE CLEARANCE. FIGURE 10-1 TABLE 10-1 All piping must conform to all applicable codes and standards See INTRODUCTION. Q WARNING: When pressure testing the piping, the tank must be isolated from the piping system. The test pressures for piping may cause the tank to explode and cause death, severe personal injury or property damage. 0 Q CAUTION: When extending monitoring or vapor recoverypiping to the surface, be sure that the at grade fittings are different from any fill fittings and will not accept standard fill hoses. 11. St]MPS/BOTTOM FITTINGS If the tank has a sump or a bottom fitting, take extra care that the tank does not rest or roll on it prior to installation. During installation, provide a clear area in the backfill bedding so that the tank rests on the backfill bedding and the sump or bottom fitting is clear. After setting the tank, fill and tamp the resulting void by hand before continuing the backfilling. When the tank has been set, tested and backfilled, and all piping and venting has been completed, the balance of the backfill material may be added. When the tank has been backfilled to subgrade, take the final diameter reading (Deflection reading "B" on the checklist). The same material, as specified in Section 3, must be used to completely fill excavation. The backfill must be free of debris. Any blocks or bricks used as support material during piping must be removed prior to completion of backfilling. Safety measures, such as placing barricades until installation is complete, should be used around the excavation site. Be sure that the installation meets all of the requirements of minimum cover, as specified in Section 4. Be sure that the checklist is properly completed. 13. DEFLECTION MEASUREMENT DIPSTICK PREPARATION Drive a small -headed, non -sparking (e.g. brass) nail halfway into a wooden dipstick 1 inch above its base. FIRST DIAMETER READING (PRIOR TO BACKFILL) 1. Place the dipstick into a service fitting. 2. Measure and record the distance from the tank bottom to the top of the fitting. 3. Pull the dipstick up until the exposed nail catches on the inside top of the tank. 4. Measure the distance from the tank top (inside) to the top of the fitting. Subtract 1 inch from this measurement and record the distance. 5. Subtract the second distance from the first and record this value as reading "A" on the Installation Checklist. SECOND DIAMETER READING (AFTER BACKFILL) 1. Place the dipstick into a service fitting with a standpipe installed to subgrade. 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 the tank. CJ 0 INTERIOR DIMENSIONS (IN) TRNR DIIL "A" "a" "0" „0" "E„ „r "e„ "N" "I., 4' 49'/z 54% 1 48 51% 561/B 48 6 73 78 712/s 72% 77z/4 701/s 751/5 801/4 713/5 8' 93 98 91'/15 91'/2 96'/4 901/s 95% 100'/2 91'/16 ld 121 126 1193n5 1203/4 1253/4 118'/2 123112 12848 119'h6 12' 138'/4 1431/4 1361/6 TABLE 10-1 All piping must conform to all applicable codes and standards See INTRODUCTION. Q WARNING: When pressure testing the piping, the tank must be isolated from the piping system. The test pressures for piping may cause the tank to explode and cause death, severe personal injury or property damage. 0 Q CAUTION: When extending monitoring or vapor recoverypiping to the surface, be sure that the at grade fittings are different from any fill fittings and will not accept standard fill hoses. 11. St]MPS/BOTTOM FITTINGS If the tank has a sump or a bottom fitting, take extra care that the tank does not rest or roll on it prior to installation. During installation, provide a clear area in the backfill bedding so that the tank rests on the backfill bedding and the sump or bottom fitting is clear. After setting the tank, fill and tamp the resulting void by hand before continuing the backfilling. When the tank has been set, tested and backfilled, and all piping and venting has been completed, the balance of the backfill material may be added. When the tank has been backfilled to subgrade, take the final diameter reading (Deflection reading "B" on the checklist). The same material, as specified in Section 3, must be used to completely fill excavation. The backfill must be free of debris. Any blocks or bricks used as support material during piping must be removed prior to completion of backfilling. Safety measures, such as placing barricades until installation is complete, should be used around the excavation site. Be sure that the installation meets all of the requirements of minimum cover, as specified in Section 4. Be sure that the checklist is properly completed. 13. DEFLECTION MEASUREMENT DIPSTICK PREPARATION Drive a small -headed, non -sparking (e.g. brass) nail halfway into a wooden dipstick 1 inch above its base. FIRST DIAMETER READING (PRIOR TO BACKFILL) 1. Place the dipstick into a service fitting. 2. Measure and record the distance from the tank bottom to the top of the fitting. 3. Pull the dipstick up until the exposed nail catches on the inside top of the tank. 4. Measure the distance from the tank top (inside) to the top of the fitting. Subtract 1 inch from this measurement and record the distance. 5. Subtract the second distance from the first and record this value as reading "A" on the Installation Checklist. SECOND DIAMETER READING (AFTER BACKFILL) 1. Place the dipstick into a service fitting with a standpipe installed to subgrade. 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 the tank. CJ 0