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150 <br /> HICKMAN <br /> TLE i ,- �• � �uG`r®r/®Y11SECTION 6 <br /> INSTALLATION <br /> 1.6.1 Piping layout the tank.Support pipe properly 4, Timing-Cover the pipe as soon <br /> Advance planning of the piping to prevent traps or sumps. as possible after successful test- <br /> p 8 8 ing to eliminate the chance of <br /> layout is essential.It will make ser- 2. The piping should be separated damage to the pipe, floating of <br /> vicing the system easier and can by a distance of at least four the pipe due to flooding, or <br /> reduce the quantities of material inches 002 mm);the pipe and shifting of the line due to cave- <br /> required. trench wall should be separated ins. If damage is suspected,the <br /> i. Using the shortest practical by at least six inches 052 mm). lines should be retested. <br /> route, run pipe in a single See Figure 1.6.3 and Note. g, Frozen earth will eventually <br /> trench from the tanks to the 3. Compact backfill carefully over thaw, leaving the pipe with <br /> dispensers and from the tanks and around the piping system insufficient support and voids <br /> to the vent risers, to prevent the vibration of around the pipe. Take care to <br /> 2. Pipe should run parallel to the tamping equipment from driving remove frozen lumps from all <br /> tanks and dispensers. small stones into the pipe wall backfill materials before back- <br /> (See Figure 1.6.1), filling (See Figure 1,6.2). <br /> 3. Avoid piping across the tanks. <br /> 1.6.2• Trenching and backfilling 100 <br /> Proper construction of trenches is <br /> a <br /> important. They should be wide :S• *. ' <br /> and deep enough to accommodate <br /> the piping and backfill material. O O <br /> See Table 1.6.1 for recommended <br /> minimum burial depths. YES NO <br /> 1. Typically,all piping should slope Figure 1.6.1 Figure 1.6.2 <br /> at least %a inch per foot toward <br /> TABLE 1.6.1 ® G•+,,.���L- <br /> RECOMMENDED MINIMUM BURIAL DEPTHS <br /> Min.Amount of Sand <br /> Minimum or Pea Gravel above <br /> Pipe Size Surface Condition Burial Depth _ the top of the pipe <br /> Qn.) .e, mm (in.) R":7- mmr, :; .' on.) 57:* r6fii).. <br /> t 7 "' 432 - 12 r <br /> 2 ` 51 Unpaved 305 <br /> ' Paved,min.4"(102 mm)asphalt 12 � 305`w r= 8 ��- 203 <br /> Paved,min.4"(102 mm)concrete 9 . 229 5 ::* 127: <br /> 3 k: 76 Unpaved 4) $08:' S 14 356 <br /> �.. Paved,min.4"(102 mm)asphalt <br /> 13 33t} 9 �` 229 <br /> Paved,min.4"(102 mm)concreto 11 279,'"�' 7 '•, 178 <br /> u ,r <br /> k <br /> 4t 102 Unpaved 20 508: h 14 356_. <br /> � Paved,min.4"(102 mm)asphalt 14 r'356�� 10 �; 254 <br /> Paved,min.4"(102 mm)concrete 11 279:. 7 178 " <br /> s: <br />