b'GENERAL INFORMATION Bar Screen Assemblies are Bar Screen Assemblies are used in an open channel (free surface) flow applicationsused in an open channel (free to separate & detain course debris and contraband. These unusual solids havesurface) flow applications to a potential for clogging the public sewer line, causing expensive cleaning andseparate & detain course debris downtime of the sewer system. Bar Screens can be used for sanitary or stormwaterand contraband. These unusual applications. As opposed to expensive automatic rake screens, bar screens aresolids have a potential for more economical but require manual cleaning.clogging the public sewer line, causing expensive cleaning and Bar screens are ideal for facilities which have a full maintenance staff. The bardowntime of the sewer system. screen is designed for ease of maintenance while maximizing safety. The Bar Screen consists of a structural concrete vault assembly with a preformed channel.FEATURESThe channel is placed at the flowline elevation of the inlet and outlet sewer pipeVarious Bar Screen Designsconnections (typically at 3 foot to 8 foot below grade). Within the channel, vertical stainless-steel screens are positioned at an inclined angle. Screen openings areLow Profile Designtypicallyinch to 2 inches. Often, multiple screens are used with progressivelyLEED Compliantsmaller screen openings.Texas ManufacturedThe ParkUSAs Bar Screen System presents several configurations depending Easy Installation and on application. These variations include; concrete box arrangement, stainless Maintenancesteel bar screens, optional surface liners, and flow meters.SYSTEM COMPONENTSRegardless of the complexity of the system, the Bar Screen system comprisesthe following basic components: Precast Concrete Structure w/ Access Hatch, Grating, or HandrailsStainless Steel Platforms & ScreensOSHA Approved LaddersAutomatic Flow Meter & Totalizer Protective Surface LinersHoists & Raking Tools OPERATIONParkUSAs Bar Screen System captures unwanted floatable pollutants from wastewater systems. In the unit, the influent will encounter a floatable collection bar screen that traps floating debris as small as 1inch in size, preventing them from invading rivers, drainage swales, lakes, bayous, estuaries, and coastal waters. The separated effluent will exit the Bar Screen System and continue through the sewer system, leaving behind the debris in the product.DESIGN CONSIDERATIONSScreening devices are classified based on the size of the material they remove(the screenings). The size of screening material refers to its diameter. The Table on the following page lists the correlation between screening sizes and screening device classification. In addition to screening size, other design considerations include the depth,width, and approach velocity of the channel; the discharge height, the screen angle; wind and aesthetic considerations; redundancy; and head loss. The use of fine screens produces removal characteristics similar to primary sludge removal in primary sedimentation. Fine screens are capable of removing 20 to 35 percent suspended solids and BOD5. Fine screens may be either fixed or movable, but are permanently set in a vertical, inclined, or horizontal position and must be cleaned by rakes, teeth, or brushes.430'