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5 Field cutting and Tapering with power tapering tools tapering primary pipe Pipe is most often tapered using one of several power tapering tools. Manufacturers' (cont' d.) names and addresses may be obtained from Ameron distributors. Pipe tapered with these tools should be periodically checked against a factory taper for taper length and taper angle. On 2" pipe, it may be possible to simultaneously remove the containment jacket and taper the primary pipe in one step with some power tapering tools. Consult Ameron engineering department for information. Fig. 5-3. Dualoy3000/LCX can be tapered using the Ameron Taper Maker. The ratchet handle makes the Taper Maker convenient to use in confined spaces when repairing existing lines. Fig. 5-4. Pipe is typically tapered using one of several power tapering tools available from outside sources. 6 Piping system layout Observe the following procedures when operating the Taper Maker. • Check blade angle by using a factory taper as a guide. When properly adjusted, the blade should be in contact with the taper over the entire taper length. If adjustment is required, loosen the blade retaining screws and adjust the blade angle with the set screw. Taper lengths Nominal Taper Containment Pipe Size Length Removed (in) (mm) (in) (mm) min. (in., mm) 2 50 1 %2 38 2%4 70 3 80 1'/4 44 2%4 70 4 100 11/8 48 3'/2 89 • Mark the required taper length on the pipe. Refer to the taper length table below. • Insert the threaded collet shaft through the base casting and the mandrel. • Select the appropriate size collet and slide it onto the mandrel, making sure the key inside the collet engages the slot of the mandrel. • Hold the collet and tum the collet control knob clockwise until the collet begins to expand. Note that it may be necessary to adjust the cutting head to accommodate different size collets. • Insert the collet into the pipe until the back end is flush with the end of the pipe. • Expand the collet to grip the inside of the pipe by turning the collet control knob clockwise. • Lower the cutting blade until it contacts the pipe by turning the cutting head adjustment handle clockwise. • Using the ratchet handle, turn the tool clockwise, gradually lowering the cutting blade by turning the cutting head adjustment handle clockwise. Continue until a smooth taper of the proper length is obtained. The thin edge of the completed taper should be no less than 1/32 inch (0.75 mm) thick. For complete operating information, refer to the appropriate Taper Maker Product Data/Operating Instructions. Trenching, bedding and backfilling The smaller outside diameter of the Dualoy 3000/LCX coaxial pipe will save on trenching and backfilling costs. The availability of factory Jump-Overfittings also helps reduce the depth of excavation needed to maintain trench slope. Although fiberglass pipe has excellent strength, it must be protected against impact which may occur from improper handling or during backfilling. • Provide a trench width equal to the pipe diameter plus six inches on each side. Separate multiple lines by at least 4 inches. Refer to Fig. 6-2. • Provide a minimum of 18 inches of select backfill between the top of the pipe and unpaved ground surfaces. • Provide a minimum of 4 inches of select backfill between the top of the pipe and reinforced concrete pavement (4 inches minimum thickness). • Provide a minimum of 8 inches of select backfill between the top of the pipe and asphalt pavement (2 inches minimum thickness). • Slope the trench bottom evenly from the dispensers back to sumps or tanks at a minimum slope of'A in/ft. • The trench bottom must be free of hard or sharp objects.