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<br />Facility Audit Report 14 <br />San Leandro WWTF <br /> <br />Figure 3.2.1.2.1 – Schematic of Proposed Aeration Air Supply System <br /> <br />We also recommend the Lamson flow controls be reviewed, and if feasible, optimized for peak <br />efficiency at the high airflow rates. As noted in the findings, it appears the suction valve on the <br />Lamson blowers is currently used to restrict flow most of the time. This may be advantageous <br />with the current configuration, but additional energy savings at higher air flows may be possible <br />if the suction valves are optimized for the post retrofit operation. <br />We further recommend the airflow meters be calibrated prior to final design to verify their <br />accuracy. While they appear to be reasonably accurate, post retrofit energy savings will be <br />improved by accurately sizing the retrofit blower to handle the majority of airflow demands. <br />Also, we recommend verifying pressure losses in the existing blower discharge piping, and <br />estimating discharge losses in the retrofit piping, if substantial changes are made. If the <br />assumptions of accurate airflow or the assumed 1 psig blower discharge friction losses are <br />incorrect, the high efficiency retrofit blower should be optimized for the corrected airflow <br />frequency distribution and/or anticipated discharge pressure range. <br />Table 3.2.1.2.1 summarizes the capital cost estimation for the retrofit. The largest single <br />component is the turbo blower, which is based on a budgetary vendor quote. The San Leandro <br />staff indicates they would prefer to perform the procurement and installation in-house, so no <br />allowances have been made for bid quality construction documents or contractor margins. <br /> <br />150 HP Lamson150 HP Lamson <br />Existing Piping <br />Proposed Piping <br />To Basin B10 HP PD Blower <br /> <-Basin Flow Control Valves-> <br />To Basin A <br /> 100 HP Turbo Blower