COMPLIANCE INFO_2010-2014 - Laserfiche WebLink

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[1 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 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 the terminating dispenser sump or tank sump, whichever is 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. L' Fle�-,,.WORKS 8Y OAM FUELING CONTAINMENT SYSTEMS 8.4 Pipe Trench Backfilling Backfilling of the flexible Piping System should occur only after the final integrity testing has been performed on both the primary and the secondary of the pipe. Prior to backfilling completely, hand shovel the backfill material between and to the outside of the pipe to maintain the minimum required spacing between the pipes and walls of the trench. Final backfilling shall be done slowly and evenly in 4" to 6" layers as not to disturb the spacing of the pipe and to insure no voids are present in the backfill. An additional air test is recommended after backfilling to insure the backfill process has not damaged the pipe. NOTE: Use extra caution when backfilling around direct bury coax fittings. Avoid sharp impacts from backfill material and tools. 8.5 Overburden The type of surface installed above the piping can have an overloading effect on the flexible piping. Follow the overburden specifications below for product warranty compliance. CAUTION: FlexWorks piping and Access piping can be punctured by grade stakes or other sharp objects driven into the ground. The use of tracer tape or a schematic of the underground piping should be kept onsite and marked off prior to commencing any work that may damage the pipe. 8.5.1 Unpaved Surfaces If the surface is unpaved, then a minimum of 18" (457mm) of approved backfill material should be installed between the top of all flexible piping and the top of the ground surface. 8.5.2 Paved Surfaces If the surface is paved with either asphalt or concrete the total amount of pavement plus approved backfill material shall be a minimum of 18" (457mm) between the top of either the flexible piping and the top of the paved surface. 8.5.3 Access Pipe Burial Whether the surface is paved or unpaved with either asphalt or concrete then there shall be a minimum of 16" (406mm) between the top of the Access Pipe and the top of the paved or unpaved surface. 9.0 FLEX PIPING OPTIONS The OPW-FCS's Piping Systems offers several types of pipe coupling options. These options, in turn, allow for a variety of piping application -options for the flexible pipe used in both pressure piping systems and suction piping systems. 9.1 Pipe Coupling Options There are two types of pipe coupling options available for the OPW--FCS's flexible piping system. The first is coax couplings, which are a double wall non-metallic pipe coupling that can be used with both OPW-FCS's single wall and double wall piping. The second is swivel couplings, which are made of stainless steel. Both are internally expanded onto the OPW-FCS's flexible piping using the FlexWorks coupling machine.