# Design a coarse screen and calculate the headless through the rack

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Design a coarse screen and calculate the headless through the rack
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## Machine Design

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Screen examples: Ex: Design a coarse screen and calculate the headless through the rack (  B=1.82 ), using the following information: • Peak design wet weather flow = 0.631 m 3 s • !elocit" through rack at #eak wet weather flow = 0.\$0 ms • !elocit" through rack at ma%imum design dr" weather flow = 0.6 ms •  θ  = 6&', with a mechanical cleaning deice • #stream de#th of wastewater = 1.1* m • +hoose a * mm clear o#ening, and 10 mm width and &0 mm thick of -ars • +hoose 0.&0.6 m free -oard 1  *  3    Ex:  /he sewer #i#eline s"stem -elow shows in ig. 1 #i#e diameter sies (2), grades, #i#e section num-ers, and flow direction. ssume there is no surcharge and full flow in each of sections 1, *, 3, and . ll #i#es are P!+ with n = 0.013. , 4, +, and D re#resent ins#ection holes. Determine(a) the flow rate and minimum commercial #i#e sie for section 45(-) the discharge, sewage de#th, and elocit" in section 4+5 and(c) the slo#e reuired to maintain full flow in section +D. Fig. 1 &
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