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Petroleum piping <br /> •Slope the product and vapor return pipe <br /> '/a inch per foot(minimum)from dispensers <br /> to storage tanks.•Proper station layout calls <br /> for conduits and petroleum piping to be in <br /> separate trenches orsegregated in tank <br /> excavation areas.•If conduits must cross <br /> product lines,they shall do so at a 90°angle. <br /> Sumps and dispenser <br /> pans <br /> •Do not run petroleum piping in the same <br /> trench with electrical conduits.•Petroleum <br /> lines should enter on one side of the <br /> dispenser pan and electrical conduits on the <br /> other side as shown here.•When properly <br /> installed,flex connectors will make smooth, <br /> uniform bends without kinks;they will not <br /> cross over,nib against or touch one another, <br /> riser pipes or the sides of dispenser pans - <br /> and sumps•Impact valves should remain <br /> capped at all times during construction to <br /> keep debris out of lines. <br /> •The maximum allowable penetration <br /> angle at sumps is 20°.•Perpendicular <br /> penetration of sumps is preferred; <br /> perpendicular penetration of dispenser <br /> pans is required. <br /> 2 <br />