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WARNING 14. DEFLECTION Overfill protection,such as automatic shut-off devices or 14.1.GENERAL vent-restriction devices,should not be installed if 14.1.1.Obtain the deflection measurement by taking a minimun owner/operator will allow pump or pressure filling of the of two measurements of the internal diameter of the tank. tank. Failure to follow this instruction could cause tank failure and result in death or serious injury. 14.1.2.Two methods of measuring the internal diameter of the tank are described here.Both methods use a dipstick.(Similar 11.4.VENTING INTERSTITIAL SPACE methods can be used,such as with a tape measure,etc.) CAUTION 14.1.3.The deflection measurement can be obtained by using All reservoirs must be vented for proper operation. either method twice or by using each method once.Each will be described here as if that method were being used twice. 11.4.1.When the tank's interstitial space is filled with a 14.1.4.Take the initial internal-diameter measurement before monitoring fluid,the space must be vented. It is sufficient to drill backfilling the tank.(See Point 8.2.8.)In a wet-hole installation, a 114-inch-diameter hole in the side or cap of the reservoir take this measurement before the tank is placed in the standpipe as supplied by the installer. If the groundwater level excavation hole.(See Point 8.3.1.1.) could be high enough to enter a drilled vent hole,install a vent line from the standpipe to above high-water level. 14.1.5.Take other diameter measurements during the backfilling process to determine whether vertical deflection continues to be 11.4.2.When the interstitial space is dry,it is not necessary to within the limits specified by Xerxes.(See Point 6.4.6.and vent the space to atmosphere. Point 9.1.1.) 12. FILLINGTANK 14.1.6.Take the final internal-diameter measurement when the tank has been backfilled to subgrade.(See Point 13.1.6.) 12.1.GENERAL 12.1.1.Xerxes recommends only gravity filling of tanks. 14.1.7.For both methods,drive a small-headed,nonsparking nail(for example,brass)halfway into a wooden dipstick 1 inch 12.1.2.See SECTION 18, Operating Guidelines. above its base. 13. BACKFILLING TO GRADE 14.2.INTERNAL-DIAMETER MEASUREMENT WITHOUT A STANDPIPE 13.1.GENERAL 14.2.1. Place the dipstick into a service fitting. 13.1.1.Continue to take safety measures(such as placing bam- cades)around the excavation site until installation is completed. 14.2.2.Measure and record the distance from the tank bottom to the top of the fitting. 13.1.2.When the tank has been set,tested and backfilled,and all piping and venting has been completed,add the balance of .Pull the dipstick up until the exposed nail catches on the inside the backfill material. inside top of the tank. 13.1.3.The backfill must be free of debris,ice or snow.Any 14.2.4.Measure the distance from the tank top(inside)to the blocks or bricks used as support material during piping must be top of the fitting.Subtract 1 inch from this measurement and removed prior to completion of backfilling, record the distance. 14.2.5.Subtract the second distance(inside tank top to top of 13.1.4.The backfill material specified in SECTION 4 must be fitting)from the first distance(tank bottom to top of fitting). used to completely fill excavation. Record this measurement as Initial Internal Diameter on the 13.1.5.Be sure that the installation meets all of the require- Tank Installation Checklist,SECTION 4. ments of minimum cover as specified in SECTION 5. 14.2.6.For subsequent measurements of the internal diameter, 13.1.6.When the tank has been backfilled to subgrade(before repeat Points 14.2.1.through 14.2.5.When the measurement is placement of asphalt or concrete),take a measurement of the the final diameter measurement,record this measurement as internal diameter of the tank.(See SECTION 14 of the Final Internal Diameter on the Tank Installation Checklist, Installation Manual for instructions on taking diameter SECTION 4. measurements.)Record this measurement as Final Internal 14.3.INTERNAL DIAMETER MEASUREMENT WITH Diameter on the Tank Installation Checklist,SECTION 4. A STANDPIPE 13.1.7.Complete the Tank Installation Checklist. 14.3.1.Place the dipstick into a service fitting with a standpipe. 14.3.2.Measure and record the distance from the tank bottom to the top of the standpipe. 19