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FIe,%W©RKS BY DPW CI)ELING GONTAiNMENT 5V5TEMS 8.0 PIPE BURIAL REQUIREMENTS not be greater than 30". A pipe sensor must also be placed OPW-FCS's flexible piping and access piping are strong,yet in the terminating dispenser sump or tank sump,whichever still flexible,piping systems and must be buried in such a is at a lower elevation. manner that they will not compress. The burial requirements NOTE: Check your local code regulations for fall require- depend on proper pipe trenching,backfill material and burial ments other than that which is previously stated. depth.Follow these instructions for warranty compliance: 8.3.2 Suction Piping Systems 8.1 Trench Sizing Sloping the OPW-FCS flexible piping from the dispenser back Piping trenches should be dug in such a manner that the to the tank is always required for suction piping systems trench width is equal to at least twice the width of all the where maintaining prime is necessary.Shallow dispenser flexible pipes contained within. All piping within the trench sumps are recommended for use in this application. should be separated by the outside diameter of the piping 8.4 Pipe Trench Backfilling being installed with a required minimum of 2"(50 mm)of separation for all piping. Trench turns should be sweeping Backfilling of the flexible Piping System should occur only rather than sharp angles.The bottom of the trench should be after the final integrity testing has been performed on both compacted and as uniform as possible to eliminate high the primary and the secondary of the pipe. Prior to backfill- spots to insure an even layer of bedding material under the ing completely,hand shovel the backfill material between pipe. Remove all sharp rocks and debris from the trench bot- and to the outside of the pipe to maintain the minimum re- tom before bedding material is installed. quired spacing between the pipes and walls of the trench. Final backfilling shall be done slowly and evenly in 4"to 6" 8.2 Bedding&Backfill Materials layers as not to disturb the spacing of the pipe and to insure Approved bedding and backfill materials for 0PW-FC5's fiexi- no voids are present in the backfill. An additional air test is ble piping,sumps and Access piping shall meet the following recommended after backfilling to insure the backfill process specifications: has not damaged the pipe. 8.2.1 Pea Gravel 8.5 Overburden Rounded pea gravel is permitted with a minimum diameter The type of surface installed above the piping can have an of 1/8"and a maximum diameter of 3/4". overloading effect on the flexible piping.Follow the overbur- 8.2.2 Crushed Stone den specifications below for product warranty compliance. Crushed stone is permitted providing it shall be washed CAUTION:FlexWorks piping and Access piping can be clean and be of the free flowing type with an angular stone punctured by grade stakes or other sharp objects driven size between 1/8"and 1/2".(Meets ASTM C-33 paragraph 9.1 into the ground.The use of tracer tape or a schematic of requirements.) the underground piping should be kept onsite and marked off prior to commencing any work that may dam- 8.2.3 Sand age the pipe. Sand backfill is permitted providing it shall be washed clean 8,5,1 Unpaved Surfaces and is free flowing with a maximum content of 10%fines. When backfilling,make sure sand is evenly distributed and If the surface is unpaved,then a minimum of 18"(457mm)of fully compacted under and fully around the piping. approved backfill material should be installed between the NOTE:A minimum of 6"(152mm)of approved bedding top of all flexible piping and the top of the ground surface. material shall be spread and compacted evenly along the 8.5.2 Paved Surfaces bottom of the piping trench.All bedding and backfill ma- If the surface is paved with either asphalt or concrete the terial should be clean and free from ice and snow and total amount of pavement plus approved backfill material debris.Using material other than those described above shall be a minimum of 18"(457mm)between the top of ei- without written approval from OPW will void the product ther the flexible piping and the top of the paved surface. warranty. 8.5.3 Access Pipe Burial 8.3 Flexible Pipe Sloping Whether the surface is paved or unpaved with either asphalt If a continuous slope or"fall'is required from the last dis- or concrete then there shall be a minimum of 16"(406mm) penser on a piping run to the tank,then the tanks should be between the top of the Access Pipe and the top of the paved buried at a sufficient depth and the pipe entry height into or unpaved surface, the dispenser sump should be of sufficient elevation so that 9,0 FLEX PIPING OPTIONS 1/8"of fall per linear foot is maintained.OPW does not re- quireits Flexible pipe to be sloped in pressure systems. The OPW`s Piping System offers several types of pipe cou- pling options.These options,in turn,allow for a variety of 8.3.1 Pressure Piping Systems piping application options for the flexible pipe used in both If the full system warranty is desired,the difference in eleva- pressure piping systems and suction piping systems. tion of the piping between two dispenser sumps must