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rA 26.2.3 Corrosion Resistance The flexible underground piping and associated couplings, fittings and adapters which come in contact with the ground environment shall be made of non-metallic material or encapsulated by non-metallic components which prevent corrosion. 26.2.4 Structural Integrity The flexible underground piping and associated couplings, fittings and adapters shall be designed and constructed of 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 pres- sures. Piping shall be able to transfer fluid up to a maximum temperature of 125 degrees fahrenheit (52 degrees celsius). Piping shall be operational with in a temperature band of minus 40C and +65C. 26.2.6 Bend Radius The double wall flexible piping shall be capable of a min- imum bend radius without kinking, cracking or breaking. The minimum bend radii shall be equal to or less than the following: 0.75" - 18" radius 1.0" - 18" radius 1.5" - 24" radius 2.0" - 36" radius 3.0" - 48" radius 26.2.6 Fluid Flow Efficiency Both the primary inner and secondary outer pipe shall have an interior surface which is a smooth (non -corrugated) profile and be made of a low friction resistant material for improved fluid flow efficiency. 26.2.7 Operating Pressures & Vacuums The flexible underground piping shall have a minimum five to one (5:1) safety factor from maximum operating pressure for rated pressure. The maximum operating pressure rating for 1.5" diameter piping shall be 100 psi primary and 10 psi secondary. 3/4", 1", 2" and 3" piping shall be rated at a maximum operating pressure of 75 psi primary and 10 psi secondary. For suction systems the pipe shall be capable of withstanding 29" mercury vacuum. 26.2.8 Pipe Expansion The primary supply pipe shall not expand more than .0025% in diameter and overall length when pressurized to 60 psi to permit accurate pressure decay readings by an in-line leak detector. -- -- - -- - - 26.2.9 Interstitial Interconnection All primary and secondary piping shall be connected in such a way as to permit integrity testing both during installation and at periodic intervals in the future. Both primary and secondary piping shall remain continuous during operation. 26.2.10 UL® Testing Both the primary and secondary piping and their associated fittings shall be independently tested in accordance with UL 971. 20 Fle.XWOO RKS 3V OPS FUELING CONTAINMENT 5YSTEM3 21M, Storage and Handling 27.1 Storage OPW--FCS requires that all piping, fittings and system components be stored in such a manner that they will not be subject to direct sunlight and / or excessive environmental conditions. Please review the below noted warnings during product storage. • Cover all products with UV protective tarps if outside. • If tarps are unavailable, store in trailer or building until use. 27.2 Handling OPW-FCS requires that the piping, fittings and system components are handled in such a manner that it will not cause unnecessary damage to the system components. Please review the below noted warnings during product handling. • Do not drop, cut or impact the components. • Keep all piping, fittings and components in the original packaging until ready to use. • Keep all thread protectors secure until ready to use. • Keep all coupling protector caps / covers in place. • DO NOT drag, cut or scrape pipe. • Upon completion of pipe, inspect for cuts, scrapes and damage prior to close of pipe runs. • DO NOT exceed 15° angle entry for pipe into a sump. Please visit our website, www.opwfcs.com, for a detailed guide specification.