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I Flexible • • • • Piping Manual environ - I 7.1 Piping Turns to insure an even layer of bedding material under the pipe. Remove all sharp rocks and debris from the trench bottom Piping trenches should be cut with s sweeping turns.Flexible piping turns ,; before bedding material is installed. Il require specific radii depending on the pipe diameter. Piping turns 8.2 Bedding & Backfill Materials should not be less than: f� � ,r rf Approved bedding and backfill materials for the GeoFlex, 75" 18" radius " ;+ GeoVent and GeoDuct flexible piping shall meet the following 1.5" -24" radius ,17, ,? specifications: 2" -24" radius 3" 48" radius 8.2.1 Pea Gravel - Rounded pea gravel is permitted with a minimum diameter of 1/8"and a maximum diameter of 3/4". 7.2 Piping Crossovers For flexible piping systems which 8.2.2 Crushed Stone have piping crossovers, install the crossover supports at each Crushed stone is permitted providing it shall be washed clean intersection. and be of the free flowing type with an angular stone size between 1/8" and 1/2". (Meets ASTM C-33 paragraph 9.1 requirements.) 8.2.3 Sand River or other approved sand is permitted providing it shall be 7.3 Piping Supply Capacity washed clean and is free flowing. When backfilling,make sure For a pressure piping system using single piping runs routed in sand is evenly distributed and packed around the piping. series, no more than a total of six dispensing nozzles should be NOTE' A minimum of 6" (150mm) of approved serviced with a 1-1/2"single piping line to prevent unacceptable bedding material shall be spread evenly along the product flow rates. bottom of the piping trench. All bedding and backfill material should be dry and free from ice and snow and debris. Using material other than those described 7.4 Vent Piping Fall above without written approval from Environ Products If GeoVent" Piping is used for vent lines, make sure there is Inc. will void the product warranty. adequate fall back to the tank from the vent stack. 7.5 Product Sequence 8.3 GeoFlex Pipe Sloping If a continuous slope or"fall"is required from the last dispenser The dispensing product sequence will alternate from one on a piping run to the tank,then the tanks should be buried at dispenser to the next when "loop-around" is used. Pipe a sufficient depth and the pipe entry height into the dispenser crossovers are recommended at these points to correct the sump should be of sufficient elevation so that 1/8" of fall per change in product sequence in "series" routing of pressure lineal foot is maintained. piping systems if required. 8.3.1 Pressure Piping Systems 8.0 PIPE BURIAL REQUIREMENTS Pressure piping systems which are designed to meet the GeoFlex®, GeoVent and GeoDuctT' are strong, yet still flexible, specification of the GeoFlex System Warranty must be used in piping systems and must be buried in such a manner that they conjunction with the pipe sensor of the Environ LDS Leak will not compress. The burial requirements depend on proper Detection System. If the system warranty is desired, the pipe trenching, backfill material and burial depth. Follow these difference in elevation of the piping between two dispenser instructions for warranty compliance: sumps must not be greater than 30".The pipe sensor must also be placed in the terminating dispenser sump or tank sump, whichever is at a lower elevation. 8.1 Trench Sizing NOTE: Check your local code regulations for fall Piping trenches should be dug in requirements other than that which is previously such a manner that the trench width stated. is equal to at least twice the width of all the flexible pipes contained 8.3.2 Suction Piping Systems within. All piping should be positioned in the trench so all are a Sloping the GeoFlex piping from the dispenser back to the tank minimum of 2"(50mm)apart. Trench is always required for suction piping systems where turns should be sweeping rather than maintaining prime is necessary. Shallow dispenser sumps or sharp angles unless coax elbows and deep dispenser pans (coax couplings &fittings must be used) tees are used. The bottom of the are recommended for use in this application. trench should be as uniform as possible to eliminate high spots 9