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SECTIONS g Operators should wear heavy cotton clothing, including 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 (see Fig. 1.5.2). It is preset at the factory and is capable of tapering 2" and 3" (50 mm and 75 mm) diame- ter RED THREAD IIA pipe (it also scarfs 3" and 4" (75 mm and 100 mm) diameter RED THREAD IIA secondary con- tainment pipe; see Part Two of this manual. Refer to Smith Fiberglass Products' Bulletin No. F6625 for tool op- erating instructions. Use a heavy duty, industrial 12 - gauge extension cord with the Model 2100 tool. If the power tool is not available, a manual tapering tool kit from Smith Fiberglass Products may be used (see Fig. 1.5.2). The tapering tools will reproduce a field -made taper to a t V (3 mm) tolerance when compared to a factory -made ta- pered spigot. The angle for properly made field tapers for 2"-4" (50 mm -100 mm) diameter pipe should be 1% de- grees. 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. There are several power tapering tools not manufac- tured by Smith Fiberglass Products that are available for use 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 rub- ber 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 inch- es (300 mm) beyond chain to prevent oval -shaping of the pipe. ' � ping of the piping layout is essential. It will icing the system easier and can reduce the quan- 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. 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) 8 Installation Instructions