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Page 9 of 13 'C. BONDING AND ADHESIVES SYSTEMS (Fiberglass Pipe) : (CONTINUED) 3. Inspec-t all fittings for proper alignment and possible "back-out" at the joints. 4. Follow pipe manufacturer's recommendations on cure time before disturbing joints or testing. In areas of temperature below 60 degrees F (16 degrees C) , it will be necessary to apply heat for curing adhesive. Only chemical or electrical devices recommiended by pipe manufacturer are acceptable for this purpose. No open flame or sparkling devices are to be used. D. THREADED JOINTS: 1. Threaded joints must be reamed and have clean cut, perfect threads and be made up with non-hardening joint compound insoluble in petroleum products approved by Company Representative. 2. Approved joint compound: Rectorseal Gilbarco Pipe Joint Compound Permatex 57 E. FIBERGLASS TO STEEL PIPE CONNECTIONS: Fiberglass threaded-end adapters are to be threaded into the steel pipe or fitting before bonding onto the fiberglass pipe. F. SETING JOINTS: Use steel pipe and fittings: two 90 degree elbows with nipple connection (do not use close nipple or street ell) at vent risers only. G. FLEXIBLE CONNECTORS: Use flexible connectors for connection of product and vapor return piping at tanks and dispensers, and for vent piping at tanks. H. SPECIAL FITTINGS: 1. The shut-off valve ("Shear" or "Safety" valve) at the base of the product pump or dispenser is to be secured in position with a steel stabilizer as detailed on the drawings. 2. Position the valve so that the line test port plug is accessible. I. PIPE WRAPPING: All underground steel pipe and fittings shall be field primed and wrapped. Wrapping material shall be 35 mil polyethylene tape "polyken 930" manufacturered by the Kendall Company (or equal approved by Company Representative) . Wrap overlap shall be one-half width of wrapping material. Wrap 1-1/2" and 2" fittings with Polyken 900 (12 mils) with a 60% overlap. In difficult areas Polyken 931 can be used before wrapping with Polyken 900. Primer shall be Polyken 927. J. SETTING AND BEDDING PIPE: 1. A 4" minimum bed of backfill material is to be placed in all piping trenches. Smooth, compact and slope bedding material to allow a slope of 1/4" per foot toward the tanks. In extreme conditions, 1/8" per foot may be used if approved by Owner's Representative, refer to other portions of these specifications. 2. Piping shall be placed on prepared bed in such a manner as to minimize points at which one pipe may cross aver another pipe. At points where piping must cross over, a minimum of one pipe diameter must separate the pipes.