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Technical Report <br /> Mashpee,MA <br /> AIRVAC Estimate#2005-120 <br /> VACUUM STATION LOCATION <br /> The vacuum stations have been located on the suggested Pump station locations. <br /> In general, a vacuum station should be centrally located at the lowest feasible <br /> elevation. Obviously, the vacuum station site must be available for <br /> purchase/lease and easily accessible. <br /> A central location is desirable to allow for multiple service zones. This is <br /> accomplished by having multiple vacuum mains entering the vacuum station. <br /> Multiple mains allow for pipe sizing and length to be kept to a minimum. More <br /> importantly, this allows for more operational flexibility, as a problem in one zone <br /> can be isolated and corrected while service remains uninterrupted in the <br /> remaining zones. <br /> From a hydraulic standpoint, it is desirable to locate the station at the lowest <br /> possible elevation to minimize vacuum loss, reduce the number of lifts required <br /> and allow for greater area coverage. <br /> VACUUM STATION SIZING <br /> The vacuum station-is_the heart of the vacuum collection system. The major <br /> components include vacuum pumps, sewage Pumps, a collection tank and a <br /> control panel. <br /> Vacuum Pumps are used to pull sewage from the AIRVAC valve pits to a collection <br /> tank in the vacuum station. Sewage Pumps transfer the sewage from the <br /> collection tank to a force main. The vacuum station preliminary components are <br /> shown in Table 4. <br /> Table 4—Preliminary vacuum station components <br /> Vacuum system Vacuum Sewage Collection <br /> e. n <br /> pumps(9fr7l) ink(dal) <br /> pumps(gPm) t��ta <br /> 4-430 " "--' -- <br /> 2-250 1-2,500 <br /> 1 5 <br /> 2 5-430 <br /> 2-710 1-5,500 <br /> 3 5-430 <br /> 2-770 1-6,000 <br /> 4 3-430 '2-44 0 1-4,000 <br /> 5 3-430 2-480 1-4,000 <br /> The vacuum station is a package station where the skid-mounted mechanical and <br /> electrical plant is supplied pre-assembled, tested and painted. This allows the <br /> skid to be lifted into the building and connect to the incoming vacuum mains and <br /> the outgoing force or gravity main, <br /> 1:WiwacEstimates1200510512OiCAD12005-120,dm 4 <br />