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X. Flexible Hose Conne s. <br />Flexible hose connections can be installed in product and vent lines at the <br />point where they leave the tank. On suction pump installations they can be <br />put in just before the pump riser. Use of flexible connections can prevent <br />breaking of lines orfittings where settlement might cause tank movement or <br />rohere expansion and contraction might cause movement of the pipe. <br />The drawings of typical island piping indicate how connections can be made <br />using standard RED THREAD II adapters. <br />SUCTION PUMP <br />INSTALLATIONS <br />PUMP ISLAND <br />DRIVE <br />RED THREAD 11 <br />B THREADED FLEXIBLE <br />ADAPTER CONNECTION <br />SUBMERSIBLE <br />SUCTION PUMP PUMP <br />INSTALLATIONS INSTALLATIONS <br />V <br />GALVANIZED TO <br />RED THREAD 11 FLEX BLE <br />IMPACT VALVE <br />THREADED ADAPTER CONNECTION <br />GALVANIZED <br />SWING <br />ASSEMBLV13j <br />(3) RED THREAD 11 pipe is inherently flexible. API Publication 1615 states: "Fiberglass piping <br />V which is inherently flexible does not require swing joints, if at least 4 feet of straight run is <br />A provided between any directional change exceeding 30°." <br />A <br />C <br />XI. Burial <br />Size <br />Surface Condition <br />Min. <br />Burial <br />Depth <br />Min. Amount of Sand <br />or Pea Gravel above <br />the top of the pipe <br />2" <br />Unpaved <br />17" <br />12" <br />Paved, min. 4" asphalt <br />12" <br />8" <br />Paved, min. 4" concrete <br />9" <br />5" <br />3" <br />Unpaved <br />20" <br />14" <br />Paved, min. 4" asphalt <br />13" <br />9" <br />Paved, min. 4" concrete <br />11" <br />7" <br />4" <br />Unpaved <br />20" <br />14" <br />Paved, min. 4" asphalt <br />14" <br />10" <br />Paved, min. 4" concrete <br />1 11 " 1 <br />7" <br />Minimum acceptable burial depths are given in this section. In some cases <br />greater depths may be required by the authority having jurisdiction or by <br />local codes. <br />The maximum allowable burial depth is 23 feet for burial in moderately <br />compacted soils which do not contain clay and where the soil modulus is at <br />least 1000 psi. <br />Minimum burial depths shown in the above burial table are acceptable if, and <br />only if, the ditch width is 2.5 feet or less; the paved surfaces extend at least 2 <br />feet on either side of the ditch; the fill material is clean sand or %a" to W, pea <br />gravel; and 6" of the fill material is placed under the pipe as bedding <br />material. <br />Remaining backfill above sand or pea gravel amounts as shown in the last <br />column of the burial table can be native soil if desired. Specifications <br />covering %a" to W pea gravel or crushed stone when used as bedding and <br />backfill material conform to Underwriters' Laboratories of Canada speci- <br />fication S-615. <br />If burial conditions other than those discussed above exist, contact A.O. <br />Smith -Inland Inc. <br />®A0. Smith -Inland Inc., 1984 <br />��atC�atitecfs' ®ab®ra!•orte� ani <br />LISTED <br />NONMETALLIC UNDERGROUND PIPING <br />FOR PETROLEUM PRODUCTS ONLY <br />Printed in U.S.A. <br />5M285 <br />