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7.1 Piping Turns Piping trenches should be cut with sweeping turns. Flexible piping turns require specific radii depending on the pipe diameter. Piping turns should not be less than: .75" - 18" radius 1.0" - 18" radius 1.5" - 24" radius 2" - 36" radius 3" - 72" radius 7.2 Piping Crossovers For flexible piping systems which have piping crossovers, install the crossover supports at each intersection. 1-1/2" and 2" only. Note: When crossover supports are not available, a minimum compacted layer of either 2" of approved pea gravel or crushed stone or 4" of approved sand backfill must separate each pipe. 7.3 Piping Supply Capacity For a pressure piping system using single piping runs routed in series, no more than a total of six dispensing nozzles should be serviced with a 1-1/2" single piping line to prevent unacceptable product flow rates. Consult OPW- FCS's customer service department for flow rate calculations. 7.4 Vent Piping Fall If Vent Piping is used for vent lines, make sure there is adequate fall back to the tank from the vent stack. OPW- FCS requires a minimum 1/8" per foot slope for all vent lines. 7.5 Product Sequence The dispensing product sequence will alternate from one dispenser to the next when "loop -around" is used. Pipe crossovers are recommended at these points to correct the change in product sequence in "series" routing of pressure piping systems. 8.0 PIPE BURIAL REQUIREMENTS OPW-FCS's flexible piping and access piping are strong, yet still flexible, piping systems and must be buried in such a manner that they will not compress.The burial requirements depend on proper pipe trenching, backfill material and burial depth. Follow these instructions for warranty compliance: 8.1 Trench Sizing Piping trenches should be dug in such a manner that the trench width is equal to at least twice the width of all the flexible pipes contained within. All piping within the trench should be separated by the outside diameter of the piping being �. installed with a required minimum of 2" (50 mm) of separation for all piping. Trench turns should be sweeping rather than sharp angles. The bottom of the trench should be F/e.AW(ORKS BY OPW FUELING CONTAINMENT SYSTEMS compacted and as uniform as possible to eliminate high spots to insure an even layer of bedding material under the pipe. Remove all sharp rocks and debris from the trench bottom before bedding material is installed. 8.2 Bedding & Backfill Materials Approved bedding and backfill materials for .` OPW-FCS's flexible piping, sumps and Access piping shall meet the following specifications: 8.2.1 Pea Gravel Rounded pea gravel is permitted with a minimum diameter of 1/8" and a maximum diameter of 3/4". 8.2.2 Crushed Stone Crushed stone is permitted providing it shall be washed clean 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 Sand backfill is permitted providing it shall be washed clean and is free flowing with a maximum content of 10% fines. When backfilling, make sure sand is evenly distributed and fully compacted under and fully around the piping. NOTE: A minimum of 6" (152mm) of approved bedding material shall be spread and compacted evenly along the bottom of the piping trench. All bedding and backfill material should be clean and free from ice and snow and debris. Using material other than those described above without written approval from OPW-FCS Products Inc. will void the product warranty. 8.3 Flexible Pipe Sloping If a continuous slope or''fall" is required from the last dispenser on a piping run to the tank, then the tanks should be buried at a sufficient depth and the pipe entry height into the dispenser sump should be of sufficient elevation so that 1/8" of fall per linear foot is maintained. OPW-FCS does not require its flexible pipe to be sloped in pressure systems. 8.3.1 Pressure Piping Systems If the full system warranty is desired, the difference in elevation of the piping between two dispenser sumps must not be greater than 30". A pipe sensor must also be placed in the terminating dispenser sump or tank sump, whichever is at a lower elevation. NOTE: Check your local code regulations for fall requirements other than that which is previously stated. 8.3.2 Suction Piping Systems Sloping the OPW-FCS flexible piping from the dispenser back to the tank is always required for suction piping systems where maintaining prime is necessary. Shallow dispenser sumps are recommended for use in this application. 8.4 Pipe Trench Backfilling Backfilling of the flexible Piping System should occur