9380 - Laserfiche WebLink

Home Browse Search

Option B - Vertical Flat Plate Screens in V-Confi~ration General This option involves the screen structure with vertical flat plate screens similar to what was described for Option A, except the screens are placed in a V -shaped configuration. This arrangement is shown on Figure 4. The elevations of the invert, base of the screens, and water depth on the screens are the same as Option A. Sheet 6 in Appendix C shows the calculations for screen size assuming an approach velocity of 0.5 fps. Selected for Option Bare 30 screens, 8 feet long by 8 feet tall. This will give 15 screen panels on each leg of the V. The panels are made of stainless steel perforated plate attached to a steel support frame. The panels are then attached to a structural steel beam and column support system. An access platform is provided along each side of the V. Photos 6 and 7 in Appendix A shows an example of this type of screen. The same two methods of providing screen cleaning discussed for option A would be used for this configuration. The difference is that two cleaners would be required, one for each side of the V. Photos 6 and 7 in Appendix A show an example of screen cleaners for this type of screen. The screens on each side of the V -configuration are 120 feet in length. The contact time along the face of the screens assuming a sweeping velocity of 2.0 fps would be 60 seconds. This screen would not likely require an intermediate bypass. Estimated Cost The same cost curve and assumptions used for Option A would apply for this option. Therefore, 14 I I I I I I I I I I I I I I I I I I I