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<br />Facility Audit Report 11 <br />San Leandro WWTF <br />requirements, we split the apparent 2 psig extra pressure drop between the blower suction valve <br />loss, which will be eliminated for the high efficiency blower and the discharge piping loss, which <br />may remain the same for the high efficiency blower. Stated differently, we add 1 psig to the <br />measured system pressure to estimate the pressure required at the retrofit blower discharge. <br />Figure 3.2.1.1.2 – System Pressure vs. Process Airflow <br /> <br /> <br />Three types of high efficiency blower systems were evaluated as process air system retrofit <br />candidates: 1) a single 100 HP Neuros turbo blower, 2) dual ABS turbo blowers, at 93 and 200 <br />HP operated sequentially, and 3) dual Universal EE-PAC 60 HP positive displacement lobe type <br />blowers operated separately and in tandem. <br />Figure 3.2.1.1.3 below compares the energy performance of the three retrofit options supplying <br />air over the 2010 baseline demand range. While there is infrequent demand above 4000 <br />SCFM, we analyzed retrofit performance up to 7000 SCFM to demonstrate the 2010 baseline <br />airflow capacity remains post-retrofit. The high efficiency systems can improve low air demand <br />energy efficiency and be supplemented with the remaining Lamsons to provide high airflow <br />demands, all the way to 7000 SCFM. <br /> <br /> <br />y = 2.59E‐04x + 4.91E+00 <br />R² = 8.87E‐01 <br />4 <br />4.5 <br />5 <br />5.5 <br />6 <br />0500100015002000250030003500 <br />Sy <br />s <br />t <br />e <br />m <br /> <br />P <br />r <br />e <br />s <br />s <br />u <br />r <br />e <br />, <br /> <br />P <br />S <br />I <br />G <br />Process Airflow, SCFM <br />System Pressure, PSIG <br />3/3/11 Spot Measurement <br />Linear (System Pressure, PSIG)