Intake Screen Alternatives for the IPL Project- Planning for Mussels and Variable Intake Depths

摘要

Based on the manufacturer provided quotes, a review of comparable intakes, and the estimated annual O&M costs, a rotating screen system would have less sustainable characteristics and be much more costly to install and maintain than vertical flat screens or T-screens. The vertical traveling screens also require the following: 1.Tensioning every 2 years, which will require training of O&M staff 2.Purchasing and storage of spare plastic screen components The cost to purchase and maintain vertical flat screens is approximately 50% more than T-screens. Additionally, the design and successful operation of a vertical flat screen cleaning brush system for this project would be very challenging due to the screen depth and fact that the brush travel guide would be located over the screen access area. The screens will be removed from the water every 3 months for desiccation and brush system would need to be disassembled and reassembled each time. Based on this information CH2M HILL recommended and received approval to eliminate the vertical traveling screen and vertical flat screen systems from further consideration and continue designing the T-screens for the IPL intakes.