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In all cases, the pipe must be completely surrounded with select backfill (sand, 118" to 3/4" pea gravel, or 118" to 1/2" washed, crushed stone). There should not be any voids under or around the pipe. Six inches (150 mm) of the fill must be placed under the pipe as bedding material. Native baokfill materials should never be used. TABLE 5. Reoommended Minimum Burial Depths Based on Soil Modulus of 1,000 psi or Higher (Refer to ASTM D3S39 or AWWA 0950 for Method/Theory) JOINT PREP It is recommended that all bonding surfaces be cleaned before bonding. Do not touoh the bonding surfaoes or allow them to beoome oontaminated. Acceptable cleaning methods are as follows: • Sand all bonding surfaces until contamination is removed. The sanding operation must be light enough to prevent changing the taper angle. • Cut off contaminated surface and replace with a new taper or sleeve coupling. • Wire brushes may be used for cleaning T.A.B. surfaces; however, they must be clean and free of oil contamination. Solvent may be used if preferred by the customer. Some typical cleaning solvents available are - acetone, methylene chloride, and methyl ethyl ketone. After cleaning, be sure any residual solvent has evaporated before applying adhesive. Do not use solvents that leave an oily film on the bonding surfaces. flammable. Read warning labels on oontainers. Never use gasoline, turpentine, or diesel fuel to olean joints. All solvent should be evaporated before applying adhesive. Repairing Weathered Surfaoes (UV Degradation) When machined surfaces of pipe and fittings are exposed to direct sunlight for a prolonged period of time, the result could be a loss of bond strength. All machined surfaces that have turned yellow or brown in color must be repaired. For exposed T.A.B, ends, cut 1/2" minimum off of the end of the spigot and retaper. Exposed flitting bells and pipe tapers should be lightly sanded with an SO to 120 grit sandpaper or Emery cloth until the original factory -fresh appearance returns. T.A.B. couplings cannot be repaired; they must be replaced. 11 Minimum Min. Amount of Sand. Pea Gravel, Pipe Size Burial Depth Crushed Stone Above Top of Pipe Surface Condition A B In. mm In. rnm In. rnm 2 50 Unpaved 17 432 12 305 Paved, min. 4" (100 mm) asphalt 12 305 8 203 Paved, min. 4" (100 mm) concrete 9 229 5 127 Paved, min. 6" (150 mm) concrete 9 229 3 76 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 Paved, min. 6" (150 mm) concrete 10 254 4 102 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 Paved, min. 6" (150 mm) concrete 10 254 4 102 6 150 Unpaved 36 914 14 356 Paved, min. 4" (100 mm) asphalt 24 610 10 254 Paved, min. 4" (100 mm) concrete 20 508 7 178 Paved, min. 6" (150 mm) concrete 16 406 4 102 JOINT PREP It is recommended that all bonding surfaces be cleaned before bonding. Do not touoh the bonding surfaoes or allow them to beoome oontaminated. Acceptable cleaning methods are as follows: • Sand all bonding surfaces until contamination is removed. The sanding operation must be light enough to prevent changing the taper angle. • Cut off contaminated surface and replace with a new taper or sleeve coupling. • Wire brushes may be used for cleaning T.A.B. surfaces; however, they must be clean and free of oil contamination. Solvent may be used if preferred by the customer. Some typical cleaning solvents available are - acetone, methylene chloride, and methyl ethyl ketone. After cleaning, be sure any residual solvent has evaporated before applying adhesive. Do not use solvents that leave an oily film on the bonding surfaces. flammable. Read warning labels on oontainers. Never use gasoline, turpentine, or diesel fuel to olean joints. All solvent should be evaporated before applying adhesive. Repairing Weathered Surfaoes (UV Degradation) When machined surfaces of pipe and fittings are exposed to direct sunlight for a prolonged period of time, the result could be a loss of bond strength. All machined surfaces that have turned yellow or brown in color must be repaired. For exposed T.A.B, ends, cut 1/2" minimum off of the end of the spigot and retaper. Exposed flitting bells and pipe tapers should be lightly sanded with an SO to 120 grit sandpaper or Emery cloth until the original factory -fresh appearance returns. T.A.B. couplings cannot be repaired; they must be replaced. 11