19 Specific Flow Rate – gpm per Inch of Coalescer Length for 6” Diameter Cartridges Aviation Fuel Filtration in commercial applications is governed by the complex, stringent requirements of EI 1581, 5th Edition. Refer to the appropriate Parker Velcon literature or contact your Parker Velcon Representative for assistance. For non-aviation applications the following guidelines have proven to be useful. Note, however, that these guidelines are general in nature and should be used for guidance only. 1. Determine total length (inches) of 6” diameter cartridge required: a. Find the approximate viscosity of your hydrocarbon fluid on the Chart Y-axis. b. Find the corresponding Specific Flow Rate (gpm/ inch) on the X-axis. c. Divide Total Flow Rate (gpm) of your application by this Specific Flow Rate to calculate total inches of coalescer required. 2. Select cartridge model and calculate quantity required: a. Choose model (type and length) cartridge to use. 83 Series Coalescers are recommended for most applications. Other types and sizes are offered for special applications b. Calculate minimum number of cartridges required by dividing total inches (from Step 1) by length of cartridge selected. 3. Select the Filter/Separator Vessel for your application: a. Refer to the Parker Velcon literature for HV (horizontal) or VV (vertical) Filter/ Separators. b. Find the appropriate vessel for the model and quantity Coalescer Cartridge selected in Step 2. NOTES These guidelines assume a specific gravity of 0.92 or less, and an influent water concentration of 3% or less. In general, if the Interfacial Tension (IFT) of the hydrocarbon over water is 36 dynes per centimeter or greater, effluent water levels of 15 ppm or less can be achieved. Surfactants will significantly lower IFT with a corresponding decrease in coalescing performance. Surfactants can occur naturally (diesel fuel) or they can be intentionally added as corrosion inhibitors (pipelines, lube and hydraulic oils) and detergent dispersants (automotive gasoline). As previously discussed, diesel and fuel oils are a special category. 2 or 4 Series Coalescer Cartridges are commonly used. Pleated paper separator cartridges are typically specified since diesel often contains materials that adhere to Teflon® separators and cannot be cleaned off – nullifying their cost effectiveness. Refer to Parker Velcon V Series Filter/ Separator Vessels literature. Oversizing filtration equipment improves performance and extends cartridge life. Strong bases (high pH fluids) attack glass microfibers and break down the coalescing media. Caustic washing or applications with high concentrations of MEA or DEA should be limited. Initial differential pressure (with clean coalescer cartridges) will be less than 5 psi. Cartridges should be changed when the differential pressure reaches 15 psi or after one year – whichever occurs first. Vessel Selection Guidelines
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