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Flexible • • . • environ 23.1.4 Vent Stack Connections 24.2.4 Corrosion Resistance At the other end of a GeoVent" The flexible underground piping and associated couplings, pipe line the pipe connects to fittings and adapters which come in contact with the ground a vent stack for tank vapor environment shall be made of non-metallic material or venting applications. This encapsulated by non-metallic components which prevent connection is made using an corrosion. Environ Terminating Elbow fitted to the appropriate coupling. Metallic fittings may 24.2.5 Structural Integrity be wrapped with pipe tape The flexible underground piping and associated couplings, to further protect the fitting fittings and adapters shall be designed and constructed of components from corrosion. materials strong enough for its intended use.The flexible piping shall not collapse, crack or break due to ground movement or from backfill and high ground water pressures. 24.2.6 Bend Radius The double wall flexible piping shall be capable of a minimum bend radius equal to twelve (12)times the diameter of the pipe diameter without kinking,cracking or breaking. 24.0 GUIDE SPECIFICATIONS The following specifications are provided as general guidelines 24.2.7 Fluid Flow Efficiency for specific GeoFlex®-D piping, tanks sumps and dispenser Both the primary inner and secondary outer pipe shall have an sumps or dispenser pans. interior surface which is a smooth (non-corrugated) profile and be made of a low friction resistant material for improved fluid 24.1 Short Form flow efficiency. The contractor shall provide a flexible underground piping system whereby the flexible piping, pipe fittings, pipe adapters 24.2.8 Operating Pressures & Vacuums and under dispenser riser pipes are secondarily contained and having no metallic components exposed to the environment. For pressure piping systems the primary supply pipe shall have The primary pipe shall be capable of being air pressure tested to a maximum operating pressure of at least 2-1/2 times that of the 1.5 times the operating pressure not exceeding 60 psi. The pump's normal operating pressure. For suction systems the secondary shall be capable of being air tested to 10 psi. pipe shall be capable of withstanding 29" mercury vacuum. 24.2 Long Form 24.2.9 Pipe Expansion The following guide specification is designed primarily around The primary supply pipe shall not expand more than .0025% in the use of GeoFlex-D piping with coaxial couplings &fittings. diameter and overall length when pressurized to 60 psi to permit accurate pressure decay readings by an in-line leak detector. 24.2.1 Design The contractor shall provide a secondarily contained flexible 24.2.10 Interstitial Interconnection underground piping system which shall provide secondary All primary and secondary piping shall be connected in such a containment for all primary piping, couplings, fittings and way as to permit integrity testing of both during installation,as adapters.The piping design shall allow any leak in the primary well as at periodic intervals in the future. Both primary and supply or secondary containment piping to be directed to a secondary piping shall remain continuous during operation. leak detection sensor. 24.2.11 LICTesting 24.2.2 Product Compatibility Both the primary and secondary piping and their associated The flexible underground piping and associated couplings, fittings shall be independently tested in accordance with UL fittings and adapters shall be chemically compatible with the 971. products to be distributed and with chemicals found naturally in the ground environment. 25.0 WARRANTY 24.2.3 Permeability I. Thirty Year GeoFlex® System Warranty The primary inner supply piping shall not permeate the liquid to be transferred of more than 1% of its total volume over a 180 Environ Products, Inc. ("Seller") warrants that products sold by day period of time. The secondary containment pipe shall not [ it which are incorporated into its GeoFlex System, as herein permeate the liquid to be transferred of more than 1%of its total volume over l 30 day period of time. defined, shall be of good materials and workmanship and free from functional defects for a period of thirty (30) years from date of sale, excepting products containing electrical 24