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Proper tapering tolerances are set at the factory. However, it is recommended the tool settings be checked prior to tapering pipe. To compensate for wear of the grinding drum, the mandrels can be field adjusted. Refer to the tool operating instructions for field adjustment procedures. The tapering tools will produce a field -made taper that inserts into the same bell to ±1/8" (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 1314 degrees. NOTE- If the manual tapering tool is used, make sure the blade holder reads 13/4 degree. If not, it should be replaced. WARNING - When tapering pipe with a 2000 series power tool, DO NOT rotate pipe with your hand over the end of the pipe as this oould result in serious injury. Plaoe both hands firmly around the pipe a minimum of 2" from the end of the pipe and rotate oounter olookwise. Keep a firm grip on the pipe at all times and keep moving in a oonstant motion. If you loosen your grip on the pipe, the grinding drum oould grab the pipe and spin it baokwards resulting in the pipe being looked up on the tool and possibly oausing injury. There are several power tapering tools available for use with Red Thread IIA piping systems that our company does not manufacture. It is the tool operator's responsibility to ensure that the tool being used is reproduoing a field - made taper that is within the toleranoes of a faotory- made tapered spigot. Refer to Manual No. F6600 for the correct fxo ;enures to verify matching tapered spigot tolerances. f F, 0If the power tools are not r t s' available, a manual taperingr tool kit should be used. The V-6" tool (F6600) is a hand- held tool that can be adapted for a power drive when a large number of tapers are >. required. When using a manual tool and pipe is clamped into a chain vise, extend pipe at least 12 Inches (300 mm) beyond chain to prevent ovaling of the pipe. For short nipples, taper one end of the pipe and cut to the desired finished length. Insert the tapered side into a sleeve coupling. Insert into tool and taper. All tapering tool settings should be oheoked at the be- ginning of eaoh job. 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 5 for recommended minimum burial depths. Typically, piping should be sloped at least f/s" (3 mm) per foot toward the tank. Support pipe properly to prevent low points. The piping should be separated by a distance of at least four to six inches (100 mm -150 mm). For double-wall secondary containment piping installations, refer to Table 11 on page 14 for recommended distances. 0'01 fZ. MN. Rnf€ar to Tnhla 5 for Compact backfill carefully over and around the piping system. When using tamping equipment, take care to prevent vibration from driving small stones into the pipe wall. The amount of compaction and,, the type of soil determines the soil modulus. For example, pea gravel has Backfill nuwst a typical modulus of 1,000 be tarrrlred intra psi with no compaction, shaded areas. while sand requires slight compaction (85% Proctor density) to achieve a modulus of 1,000 psi. Refer to ASTM D3839 or AWWA C950 for further details. Cover the pipe as soon as possible after successful testing to eliminate the chance of damage to the pipe, floating of the pipe due to r flooding, or shifting of the line due to caving in of the trench walls. If damage is suspected, the lines d should be retested. Frozen earth will eventually YES N 0 thaw, leaving the pipe with insufficient support and voids around the pipe. Take care to remove frozen lumps from all backfill materials before using. E`7 Of i • r r ' i. �'i�v' '��i a, MIN. MN. Rnf€ar to Tnhla 5 for Compact backfill carefully over and around the piping system. When using tamping equipment, take care to prevent vibration from driving small stones into the pipe wall. The amount of compaction and,, the type of soil determines the soil modulus. For example, pea gravel has Backfill nuwst a typical modulus of 1,000 be tarrrlred intra psi with no compaction, shaded areas. while sand requires slight compaction (85% Proctor density) to achieve a modulus of 1,000 psi. Refer to ASTM D3839 or AWWA C950 for further details. Cover the pipe as soon as possible after successful testing to eliminate the chance of damage to the pipe, floating of the pipe due to r flooding, or shifting of the line due to caving in of the trench walls. If damage is suspected, the lines d should be retested. Frozen earth will eventually YES N 0 thaw, leaving the pipe with insufficient support and voids around the pipe. Take care to remove frozen lumps from all backfill materials before using. E`7