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Rpcor;rrended Practices for Installation of Underground Liquid Storage Systems 6o D 6 � � .•6� C.c 4 0 4 D p 60. 4 p C ©0 C paving D D c o D c 6 \ � c D' 6 .p 46 � v p c D C C D o � 4 V. D �. D � a_ o c 40 � �' D p q °- � C � I . . . . . Shear . . . . . 18 . section :'St• . '. - . . . . . . Y-�.yfrF d 0 4 •a c- D C s t'�;• 6 �j+- 4 4 �=-6 .• . . . . . . . - . . . . gs:. C o o C '+'.*` s y r �• !� 17 ' �tbypt 'i T.- ;: _ EY...:-.L ...e .. --'u:3!!'U.v`W�) 45-, Y9•��,} �-V �,n'�L•IS�P! J All dimensions in inches. ;; =t;3•r-,ng•,�snp.�,:y;z :! •.'%sa_ts!i�. `�.:i �•.•.}ta�"`t:-,a's,;..,�:r:y,_ Y..c, ..? .• Figure 26.Trench dimensions.Pipe trenches must allow adequate clearance and cover to protect piping and coatings from physical damage.Backfilling and compaction requirements are the same as for tank excavations. Two-inch pipe is illustrated For other sizes, use twice the pipe diameter Figure 27.Emergency shutoff valve. In case of fire or collision, between pipes. the emergency shutoff valve stops theflow of fuel. Install the shear section level with the top of the dispenser islands. Do 1. Inspect all piping materials prior to installation not obstruct moving parts. Securely anchor the valve. to detect damage caused by shipping and han- dling and to confirm compliance with specifica- bottom. Measure this distance for each pipe and tions.Handle piping carefully at the jobsite,and tarok carefully. Also, verify the length of sub- place it carefully into position. mersible pumps,and monitor and gauge probes 2. Provide adequate clearance between piping and before installing. trench walls,electrical conduit,monitoring wells, 9. Do not remove dielectric bushings.Take care to utilities, nearby structures, and other system avoid cross-threading. components. 10. Install pumps,check valves,impact valves,flex- 3. If crossing of lines is unavoidable, provide ible connectors, overfill devices, gauges, moni- adequate clearance to prevent contact. Consult toring systems,and other system components in manufacturer's instructions for the minimum accordance with manufacturers' recommenda- clearance required for the type of piping being tions. installed. 11. Ensure that the submersible pump and attached 4. Avoid damage to piping materials or coatings piping are free to move with the tank and are during handling, installation,testing,and back- separated from the traffic slab with a street box to filling. prevent damage from settlement. 5. Keep pipe,as well as fitting interiors and threads, 12. Use extractor fittings at tank connections to free from dirt, corrosion, moisture, and debris. facilitate future testing. 6. Exercise care to accurately measure and cut pipe 9.6 Piping Requirements:Metallic Piping.The mini- to avoid the failure that can occur when pipe mum standard for metallic product piping should be at least fittings are installed under stress. Schedule 40 factory-wrapped/coated black steel pipe.with 7. Use a pipe sealant (dope or cement) that is comparable malleable iron or steel screw-type fittings and compatible with the piping materials and the extra-heavy couplings.The following constitute elements product being handled on tapered thread joints. of good practices for metallic piping systems. Wrap ribbon dope with the threads to avoid 1. Protect all piping from physical damage with bunching during tightening. Follow the nonconductive material at any point where it manufacturer's preparation and application in- passes through pavement and structures. structions, giving proper attention to tempera- 2. Inspect pipe-cutting dies frequently and replace ture and moisture condition limitation. when worn. Threaded metallic piping depends 8. Avoid damage to the tank bottom- Cut suction on a liquid-tight,metal-to-metal seal to prevent and fill lines to allow for at least 4 inches and no leaks. Du11 dies may extrude or tear threads; more than 6 inches clearance from the tank making a tight seal impossible. 19