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Il� li 4p 6` 1 I PIPING AND VENTING 11. SUMPS/BOTTOM WARNING:All internal piping must be at 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 or roll on it prior to installation. CAUTION:All single wall and double wall tanks must be vented to During installation,provide a clear area in the backfill bedding,so atmospheric pressure. that the tank rests on the backfill bedding and the sump or bottom Refer to Figure 10-1 and Table 101 to determine the correct dimen- fitting is clear.After setting the tank,fill and tamp the resulting void l sions to size internal pumps and piping. by hand before continuing the backfilling. When the tank's interstitial space is filled with a liquid,the space 12. : , CKIFILLING TO GRADE must be vented. It is sufficient to drill a 1/4"-diameter hole in the side or cap of the riser pipe as supplied by the installer.When the When the tank has been set,tested and backfilled,and all piping groundwater level will be high enough to enter a drilled vent hole, and venting has been completed,the balance of the backfill material install at vent line from the riser pipe to above grade level. may be added. When the interstitial space is dry,it is not necessary to vent the When the tank has been backfilled to subgrade,take the final space to atmosphere. diameter reading(Deflection reading"B"on the checklist). It is the installer's responsibility to select a thread sealant that is The same material as specified in Section 3 must be used to compatible with the product being stored.Some sealants cannot completely fill excavation.The backfill must be free of debris.Any be used with some products. If necessary,remove,clean and blocks or bricks used as support material during piping must be redope all plugs. removed prior to completion of backfilling.Safety measures,such as placing barricades until installation is complete,should be used ^� B -s E H around the excavations 1.e. -A 8 0 G Be sure that the installation meets all of the requirements of DIMENSION LINE DETAIL DIMENSION LINE DETAIL SINGLE PALL 6 WALL If DOUBLE WALL 1 minimum cover as specified in Section 4. SCALE,, 1/16 I/16 SCALES 1/I6 Be sure that the checklist is property completed. 13. DEFLECTION MEASUREMENT •0• A:B •F• 'E .H. DIPSTICK PREPARATION Drive a small-headed,non-sparking(e.g.brass)nail halfway into a SINGLE PALL RIMED OUTER WALL StWALL 11 IOOTH OUTEALL RLWALL wooden dipstick 1"above its base. NOTE, FIRST DIAMETER READING(PRIOR TO BACKFILL) 1 - ALL FITTING DIMENSIONS ARE MEASURED FROM THE TOP OF A SERVICE FITTING TO THE INSIDE BOTTOM OF THE TANK ANO 1. Place the dipstick into a service fitfin . INCLUDE GAME PLATE CLEARANCE. P g 2 - INTERIOR DIAMETERS 00 NOT INCLUDE GAME PLATE CLEARANCE. 2. Measure and record the distance from the tank bottom to the FIGURE 10-1 top of the fitting. 3. Pull the dipstick up until the exposed nail catches on the inside TABLE 10-1 top of the tank. INTERIOR DIMENSIONS(IN) 4. Measure the distance from the tank top(inside)to the top TANK "B" of the fitting.Subtract 1"from this measurement and record DIA. "A" "C" "D" "E" "F" "G" "R" "I" the distance. 4' 49.50 54.50 48.00 51.50 56.625 48.00 5. Subtract the second distance from the first and record this value as reading"A"on the Installation Checklist s' 73.00 78.00 71.36 72.75 77.75 70.625 75125 80.25 71.36 SECOND DIAMETER READING(AFTER BACKFILL) 8' 93.00 98.00 91188 92.75 9775 90.625 95.375 100.50 91.188 1. Place the dipstick into a service fitting with a standpipe 10' 121.00 126.00 119.16 120.75 125.75 118.50 123.50 128.625 119.16 installed to subgrade. 12' 138.25 143.25 136.625 2. Measure and record the distance from the tank bottom to the top of the standpipe. All piping must conform to'all applicable codes and standards.See 3. Pull the dipstick up until the nail catches on the inside top of INTRODUCTION. the tank. WARNING:When pressure testing the piping,the tank must be 4. Measure the distance from the tank top(inside)to the top of isolated from the piping system.The test pressures for piping the standpipe.Subtract 1"from this measurement and record may rause the tank to explode and cause death,severe personal the distance. in]ury or property damage. 5. Subtract the second distance from the first and record this \ CAUTION:When extending monitoring or vapor recovery piping to value as reading"B"on the Installation Checklist. the surface,be sure that the at-grade fittings are different from any fill fittings and will not accept standard fill hoses.