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<br />I <br /> <br />I <br /> <br />Area Thickness Range (inches) Thickness Average (inches) <br />Pedestal (at Base) 0.285 to 0.296 0.293 <br />Overflow Pipe (at Base) 0.361 to 0.372 0.365 <br />Roof 0.186to 0.195 0.190 <br /> <br />I <br /> <br />I <br /> <br />Overflow Pipe <br /> <br />I <br /> <br />The overflow pipe had a properly designed air break, The overflow terminated at <br />a splashguard/inlet or an energy dissipater to minimize erosion and reduce chlorine <br />concentrations to the receiving body of water. The overflow screen was damaged and <br />should be replaced to eliminate wildlife from entering tank through the overflow pipe. <br /> <br />I <br />I <br /> <br />Vent <br /> <br />I <br /> <br />The screens on the vent were in good condition. The vent appears to be properly <br />sized for the maximum flow event in the tank. The existing tank vent is not a clog and/or <br />frost resistant design. A WW A Standards recommend that all vents with screening <br />against insects be designed to ensure "fail-safe" operation if the screens become clogged <br />or frosted over. Therefore consideration should be given to replacing the vent. The <br />figure below shows a typical design for a clog free vent. <br /> <br />I <br />I <br /> <br />I <br />I <br /> <br /> <br />----:---- <br />, -- <br />: ,~ <br />r:,.'} - ~ . <br /><;>tl#;.-'-- ~1/2.NO'13x15Aalleoed <br />~~~" Expanded Meial Bird $ereefl <br />----. PreSs <br />,_ ._._----.::.:.-.!:!!epa'le/ <br />PTFE" Gaskets~Typ) ...-....... <br />I .......-::-0--- Vilcuump.al~ <br />-\ ~screen <br />(Brass Ma!erial laNormal} <br /> <br />i <br />I <br />I <br />I <br />I <br />i <br />I <br />I _. ~ <br />==:L_=_.~ _.='_ <br />I <br />I InstaUVantVertical5 + <br /> <br />'-" <br />-----_ Air Vacuum <br /> <br />I , <br />~, <br /> <br />SUpj}OrlBars <br /> <br />I <br />I <br /> <br />Carbon Steel Body --............ , <br /> <br />NOT!':S: <br /> <br />Roof <br /> <br />1. Pallels should be removed during coaling <br />10 prevant clogging of the scroons. <br /> <br />+Po1ytalrafluoroelhylane (PTFE) <br /> <br />2. Periodk: inspectiOl1 and millntanance is <br />required 10 keep in proper working <br />condillon. <br /> <br />Figure 1- Typical Clog Resistant Vent Detail <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br /> <br />Elevated Water Storage Tank <br />City of Arden Hills South Tank <br /> <br />26 <br />