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SMITH INSTALLING UL LISTED RED THREAD II PRODUCT PIPE LINES (continued) SUCT M Pur. DWAUAT1D11a .U..LD DRNE TTHREADRED�ED = Kmeu MR MIIR Amount of sand ADAPT" CONWCT M Burial or Pea Gravel above � Size Surface Cortion Depth the lop of"pipe si- 2" Unpaved 17" 12" e1eALlATq S eeTAu.Ai�Diu Paved,min.4"asphalt .12" - 8" . Paved,min_.4"concrete 9" 5" 3" Unpaved 20" 14" Paved,min.4"asphalt 13 9" Paved,min.4"concrete 11" 7" RED THREAD I QALR.tx�x.E ■I vPA�TO 4" Unpaved 20" 14" THR ADAPTER CONNECTION GALVAMDMD Paved,min.4"asphalt 14" 10" SWING Paved,min.4"concrete 1 11" 7" AS9E1lU'Al TYPICAL ISLAND PIPING PLUMBING —To make installation easier and to Minimum burial depths shown it the above burial table are conserve adhesive,all measuring. cutting,and tapering acceptable if, and only if,the ditch width is 2.5 feet or less; should be done first.Then proceed with the bonding the paved surfaces extend at least 2 feet on either side of operation.To make sure measurements are right, the ditch, the fill material is clean sand or 1/8" to 1/2" pea assemble the entire piping system "dry"(without adhesive) gravel and 6" of the fill material is placed under the pipe as before bonding.Where accuracy is important,"dry' bedding material. assembly is a must. For close tolerance piping refer to Remaining backfill above Sand or Pea Gravel amounts as Smith Fiberglass Installation Manual No. 9474. shown in the last column of the burial table can be native FLEXIBLE HOSE CONNECTIONS— Flexible hose soil if desired, connections can be installed in product and vent lines at If burial conditions other than those discussed above exist, the point where they leave the tank. On suction pump contact Smith Fiberglass Products. installation they can be put in just before the pump riser. Use of flexible connections can prevent breaking of lines REPAIRING — On rare occasions it may be necessary to or fittings where settlement might cause tank movement,or repair a damaged section of RED THREAD II pipe.Where where expansion and contraction might cause movement damage is in the form of a puncture,the pipe can be of the pipe. repaired using a patch made from the pipe itself. If a The drawings above of typical island piping indicate how considerable length of pipe is involved, it is best to replace it with a new section of pipe.Complete information for connections can be made using standard RED THREAD making repairs is included in the Smith Fiberglass UL II adapters. Installation Instructions Manual No. 1055. BURIAL— Minimum acceptable burial depths are given in this section. In some cases greater depths may be For industry reference, see API Publication 1615 required by the authority having jurisdiction or by local "Installation of Underground Petroleum Storage Systems" codes. and PEVRP100-86 "Recommended Practices for The maximum allowable burial depth is 24 feet for burial in Installation of Underground Liquid Storage Systems" moderately compacted soils which do not contain clay and where the soil modulus is at least 1000 psi. 131 RED THREAD II pipe is inherentlyflex ible.API Publication 1615 states. `Fiberglass piping,which is inherently flexible,does not require swing joints,if at least 4 feet of straight run is provided between any directional change exceeding 30-"