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SECTIONS ♦ Cutting & Tapering long -sleeve shirts, which protect the skin from the dust. Eye protection is required for the tool operator. 1.5.2 Tapering The matched taper concept employed by Smith Fiberglass Products is the key to excellent joint performance. A power tool (Model 2100) is available from Smith Fiberglass Products. It is preset at the factory and is capable of taper- ing 2" and 3" (50 mm and 75 mm) diameter RED THREAD IIA pipe (it also scarfs 3" and 4" (75 rnm and 100 mm) di- ameter RED THREAD IIA secondary containment pipe; see Part Two of this manual. Refer to Smith Fiberglass Products' Bulletin No. F6625 for tool operating instruc- tions. If the power tool is not available, a manual taper- ing tool kit from Smith Fiberglass Products may be used (see Fig. 1.5.2). The tapering tools will re- produce a field -made ta- per to a t V (3 mm) tolerance when compared to a factory -made tapered spigot. The angle for properly made field tapers for 2"-4" (50 mm -100 mm) diameter pipe should be 1% degrees. NOTE: If the tapering tool has an old-style blade holder, it must be replaced. The correct taper angle is 1% degrees for 2", 3", and 4" pipe sizes. with Smith Fiberglass Products piping systems. It is the tool operator's responsibility to ensure that the tool being used is capable of reproducing a field -made taper that is within the tolerances of a factory -made tapered spigot. Refer to Smith Fiberglass Products' Bulletin No. F6600 for the correct procedures to verify matching tapered spigot tolerances (factory versus field -made). Note: Protect pipe from vise damage by placing rubber sections or sleeves (180' sections of pipe cut from the same size pipe being tapered) between the pipe and the vise. When using a manual tool and pipe is clamped into a chain vise, extend pipe at least 12 inches (300 mm) be- yond chain to prevent oval -shaping of the pipe. SECTION 6 • INSTALLATION 1.6.1 Piping Layout Advance planning of the piping layout is essential. It will make servicing the system easier and can reduce the quan- tities of material required. 1. Using the shortest practical route, run the pipe in a single trench from the tanks to the vent risers. 2. Pipe should run parallel to the tanks and dispensers. 3. Avoid piping across the tanks. 1.6.2 Trenching and Backfilling Proper construction of trenches is important. They should be wide and deep enough to accommodate the piping and backfill material. See Table 1.6.1 for recommended mini- mum burial depths. 1. Typically, all piping should slope at least X" (3 mm) per foot toward the tank. Support pipe properly to prevent There are several power tapering tools not manufactured traps or sumps. by Smith Fiberglass Products that are available for use TABLE 1.6.1 Recommended Minimum Burial Depths Based on Soil Modulus of 1,000 psi or Higher (Refer to ASTM D3839 or AWWA C950 for Method/Theory) Pipe Size (in.) (mm) Surface Condition Minimum Burial Depth (in.) (mm) Min. Amount of Sand or Pea Graves Above the Top of the Pipe (in.) (mm) 2 50 Unpaved 17 432 12 305 Paved, min. 4" (100 mm) asphalt 12 30S 8 203 Paved, min. 4" (100 mm) concrete 9 229 5 127 3 75 Unpaved 20 508 14 356 Paved, min. 4" (100 mm) asphalt 13 330 9 229 Paved, min. 4" (100 mm) concrete 11 279 7 178 4 100 Unpaved 20 508 14 356 Paved, min. 4" (100 mm) asphalt 14 356 10 254 Paved, min. 4" (100 mm) concrete 11 279 7 178 8 .0 Installation Instructions • • •