b'LT ENGINEERINGCATALOGDESIGN CONSIDERATIONSThe macerator assembly vault manufactured byParkUSA is constructed of quality precast concrete,Class II 4500 PSI @ 28 days. Pre-casting the concrete shell insures that all units achieve structural and physical uniformity. The units are structurally engineered for H-20 truck loading (if specified) and can be buried withoutany need for additional structural protection. The bottom and walls are of monolithic construction to insure against joint leakage. The assembly consists of pipe, valves, fittings and a grinder unit. Pre-assembled and installed within an appropriately sized concrete vault enclosure. Assemblies are pretested and inspected to adhere to our strict quality control standards.Wastewater SystemsAll the equipment used within the macerator assembly are certified by one of the following associations: American Water Works Associations, American Society of Sanitary Engineering, CSA or Underwriters Laboratory.SIZINGParkUSA offers full support on designing a Macerator Assembly. From the concrete box and piping selection, overall specifications and sizing is available from the engineering team.Although standard sizing charts are inconvenient to establish for this type of unit, standard construction is well established. The macerator vault shall be constructed of precast concrete having a 28-day minimum compressive strength of 5000 PSI using a Type I Portland Cement.The vault shall be designed for H-20-44 traffic loadingas defined by AASHTO 14th ED. 1989 using a 30 percent impact factor. Structural reinforcement placement and bending shall be in accordance to latest ACI standards.All reinforcements steel shall comply with ASTM A615 grade 60 or ASTM A706 Grade 60. Lifting inserts to be installed for handling per manufacturers requirements. The vault shallbe coated with exterior vapor barrier Bitumastic, 15 mils DFT.MAINTENANCECleaning frequency depends on the characteristics of the wastewater entering a plant. Some plants have incorporated screening devices, such as basket-type trash racks, that are manually hoisted and cleaned. Screens reduce significantly the maintenance period of the Macerator. Mechanically cleaned screens usually require less labor for operation than manually cleaned screens because screenings are raked with a mechanical device rather than by facility personnel. However, the rake teeth on mechanically cleaned screens must be routinely inspected because of their susceptibility to breakage and bending. Drive mechanisms must also be frequently inspected to prevent fouling due to grit and rags. Grit removed from screens must be disposed of regularly.INFO@PARKUSA.COM|888-611-7275|WWW.PARKUSA.COM 421'