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® ® ® 0 CAUTION: When extending monitoring or vapor recovery piping to the surface,be sure that the at grade fittings are different from any Ali internal piping must be at least 4 inch[6 inch for 12 foot diameter tanks]from the tank bottom. fill fittings and will net accept standard fill hoses. f :• Ali single wall and double wall tanks must be vented to If the tank has a sump or a bottom fitting,take extra care that the atmospheric pressuretank does not rest or roll on it prior to installation. Refer to Figure 10-1 and Table 10-1 to determine the correct During installation,provide a clear area in the backfill bedding so dimensions to size internal pumps and piping, that the tank rests on the backfill bedding and the sump or bottom When the tank's interstitial space is filled with a liquid,the space fitting is clear.After setting the tank,fill and tamp the resulting must be vented.It is sufficient to drill a 1/4 inch diameter hole in the void by hand before continuing the backfilling. 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 tank has been set,tested and backfilled,and all piping When the interstitial space is dry,it is not necessary to vent the and venting has been completed,the balance of the backfill space to atmosphere. material may be added. It is the installer's 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 specified 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 B 6 E H removed prior to completion of backfilling.Safety measures,such P+ -A 8 D _G as placing barricades until installation is complete,should be DIMENSION LINE DETAIL DIMENSION LINE DETAIL used around the excavation site. SINGLE WALL B DOUBLE MALL It DOUBLE WALL 1 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. .C. ,A, .F. ® mine SINGLE WALL DOUBLE WALL-11 DOUBLE WALL-I RIBBED OUTER WALL SMOOTH OUTER WALL DIPSTICK PREPARATION NOTES 1 - ALL FITTING DIMENSIONS ARE MEASURED FROM THE 70P OF A Drive a small-headed,non-sparking(e.g.brass)nail halfway into SERVICE FITTING TO THE INSIDE BOTTOM OF THE TAW AND a wooden dipstick 1 inch above its base. INCLUDE GAUGE PLATE CLEARANCE. 2 - INTERIOR DIAMETERS 00 NOT INCLUDE GAUGE PLATE CLEARANCE. FIGURE 1 -1 FIRST DIAMETER READING (PRIOR T BACKFILL) INTERIOR DIMENSIONS(I ) 1.Place the dipstick into a service fitting. 2.Measure and record the distance from the tank bottom to the UNK DIA. W, 1111 uC„ ,�®„ T' 'T' 1.G„ top of the fitting. 3.Pull the dipstick up until the exposed nail catches on the inside 4' 491/2 541/2 48 51'/2 565/6 48 top of the tank. 6' 73 78 713/6 723/4 773/4 705/6 75'/6 80'/4 713/6 4.Measure the distance from the tank top(inside)to the top of 6' 93 98 913/16 911/2 961/4 905/6 953/6 100'/2 913/16 the fitting.Subtract 1 inch from this measurement and record the distance. 19 121 126 1193/16 1203/4 1253/4 1181/2 1231/2 1285/6 1193/16 5.Subtract the second distance from the first and record this 12' 138'/4 1431/4 136%/ value as reading"A"on the Installation Checklist. TABLE 1 -1 SECOND DIAMETER 1 (AFTER BACKFILL) All piping must conform to all applicable codes and standards. 1.Place the dipstick into a service fitting with a standpipe See INTRODUCTION. installed to subgrade. WARNING: 2.Measure and record the distance from the tank bottom to the When pressure testing the piping,the tank must be isolated top of the standpipe. from the piping system.The test pressures for piping may 3.Pull the dipstick up until the nail catches on the inside top of cause the tank to explode and cause death,severe personal the tank. injury or property damage.