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1.3.7.6.ANCHOR SLABS 1.3.7.7.3.Diameter measurements of the tank must be taken NOTE:The tank owner is responsible for the design at one or more locations on each tank or tank compartment. of anchor slabs. It is preferable to take the measurement near the center of a tank or compartment if possible. 1.3.7.6.1.An anchor slab is a reinforced concrete base and should 1.3.7.7.4.An initial measurement must be taken before be designed according to the applicable American Concrete Institute installation of the tank begins.This first measurement is used code or the applicable Canadian Standards Association(CSA)standard, as a comparison reference for subsequent measurements whichever is relevant. in order to check proper backfill placement. 11.3.7.6.2.The total length of the slab must be at least the same as the 1.3.7.7.5.Additional measurements must betaken: length of the tank. • after applying anchorstraps(if used) 1.3.7.6.3.The minimum slab thickness is 8 inches[20 cm]. • after backfilling is brought to the top of the tank 1.3.7.6.4.The width of the slab depends on the tank diameter. • after backfilling is brought to subgrade The slab must extend a minimum of 18 inches[46 cm](12 inches 1.3.7.7.6.Described here are two methods using a dipstick [30 cm]for 4-foot-diameter tanks)beyond each side of the tank. to measure the internal diameter of the tank—one not using 1.3.7.6.5.Provide a separate anchor point for each a standpipe and one using a standpipe. anchor strap. 1.3.7.7.7.Similar methods can be used,such as using a tape measure, 1.3.7.6.6.All anchor points must be engineered to withstand for example. the tank's buoyancy forces. 1.3.7.7.8.Both methods fortaking deflection measurements will give 1.3.7.6.7.Refer to Figure 1-12 for anchor-point height. the same result. Refer to Table 1-4 for other anchor-point dimensions. 1.3.7.7.9.For both methods,drive a small-headed,nonsparking 1.3.7.6.8.When using a concrete anchor slab,allow sufficient nail(for example,brass)halfway into a wooden dipstick 1 inch[2 cm] above its base. depth in the excavation for 12 inches[30 cm]of bedding material between the tank and the anchor slab.See Figure 1-12. DIAMETER MEASUREMENT WITHOUT Figure 1-12 A STANDPIPE Anchor Point 1.3.7.7.10.Place the dipstick into a service fitting. ---------------------- _______________ ---------------------- 1.3.7.7.II.Measure the distance from the tank bottom tothe top of the fitting and record this measurement. 12"of Bedding 15" Material 1.3.7.7.12.Pull the dipstick up until the exposed nail catches on the inside top of the tank. IF 1.3.7.7.13.Measure the distance from the tank top(inside) Concrete Slab to the top of the fitting.Subtract the distance from the nail to the base of the dipstick and record this measurement. 1.3.7.7.14.Subtract the second measurement(inside tank 1.3.7.6.9.When using our straps and turnbuckles,anchor top to top of fitting)from the first measurement(tank bottom points must extend at least 3 inches[7.6 cm]above the bedding. to top of fitting)to calculate the diameter measurement. With a 12-inch[30-cm]bedding,the anchor point is 15 inches 1.3.7.7.15.Record this diameter measurement at the [38 cm]above the slab. appropriate place(as Measurement#1,#2,#3 or#4)on the Tank Installation Checklist. 1.3.7.7.TAKING DIAMETER MEASUREMENTS GENERAL DIAMETER MEASUREMENT WITH A STANDPIPE 1.3.7.7.1.Diameter measurements must be taken at various stages of the installation process to verify that the process 1.3.7.7.16.Place the dipstick into a service fitting with is proceeding correctly. a standpipe. 1.3.7.7.2.It is important that these measurements are taken and, 1.3.7.7.17.Measure the distance from the tank bottom if needed,appropriate action is taken so that tank deflection is within to the top of the standpipe and record this measurement. allowable limits. 1.3.7.7.18.Pull the dipstick up until the nail catches on the inside top of the tank. 13