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6.0 Dosing Distribution Guidance <br /> 6.1 PUMP TO DISTRIBUTION BOX: Specify an oversized distribution box for pumped dosed systems. <br /> Provide velocity reduction in the d-box with a tee or baffle. Set d-box outlets at the same elevation to <br /> equalize flow to each line or use drop boxes at the head of each line for serial distribution. If the absorption <br /> area is installed deeper than 18 inches, the system must be vented. See section 8.0 of this manual for <br /> detailed information on vening of systems. <br /> 6.2 DOSING DESIGN AND FLOW RATE: Dosing volume must be set to deliver a maximum of 3 gallons <br /> per A42 Module per dosing cycle. Higher flow rates and short dose cycle push the effluent down the line <br /> and thus disperse the effluent over a larger area. A valve on the force main is recommended to set the <br /> flow rate so that the outlet pipes are submerged but prevents the d-box from over flowing. <br /> 7.0 Pressure Distribution Guidance <br /> 7.1 PRESSURE DISTRIBUTION: Dosing with small diameter pressurized laterals is acceptable for GSF <br /> systems. The pipe networks must be engineered and follow principles established for pressure distribution. <br /> Using pipe-in-pipe networks as shown in Figure 13, the orifice size and spacing of 3/16 inch and 4 feet is <br /> respectively recommended. On sloping sites, the orifices should be offset by 2 feet on each line. For <br /> example, the orifice on line one may be at 1 ft, 5 ft, 9 ft etc. with the next line at 3 ft, 7 ft, 11 ft etc. Flushing <br /> ports are required to maintain the free flow of effluent from orifices at the distal ends of each lateral. Contact <br /> Eljen's Technical Resource Department at 1-800-444-1359 for more information on pressure distribution <br /> systems <br /> Standard procedures for design of pressure distribution networks apply to the GSF filter. A minimum orifice <br /> size according to the regulations shall be maintained. A drain hole is required at the 6 o'clock position of <br /> each pressure lateral for drainage purposes. The lateral pipe network, constructed of PVC Sch. 40 pipe <br /> (size per design and code), is placed within a standard 4-inch perforated pipe. The perforation in the 4- <br /> inch outer pipe are set at the 4 and 8 o'clock position, the drilled orifices on the pressure pipe are set to <br /> spray at the 12 o'clock position directly to the top of the 4-inch perforated pipe as shown below. Pressure <br /> clean outs are required at the end of each lateral. <br /> Orifice shields are an acceptable replacement for the 4" pipe. <br /> FIGURE 13: PRESSURE PIPE PLACEMENT <br /> +7 <br /> 4"DIAMETER PRESSURE CLEAN OUT <br /> PERFORATED PIPE <br /> PRESSURE PIPE 4"END CAP WITH <br /> HOLE DRILLED <br /> 00 <br /> 0 <br /> PRESSURE PIPE CROSS SECTION FOR ALL APPLICATIONS <br /> 7 4"DIAMETER PERFORATED PIPE <br /> PRESSURE PIPE <br /> 2022 California Design&Installation Manual Page 20 www.eljen.com <br />