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SECTION 6: POTENTIAL FOR HEAD RECOVERY AT MWD CONNECTIONS 13 <br />6.2 MWD STATION SA -1 <br />Station SA -1 is the only MWD connection point where electricity is currently generated. The generator is in a <br />pump building at the Garthe Pumping Station. MWD water is fed through a Byron Jackson two stage hydro <br />turbine, which drives a 200 hp Siemens Allis generator to offset purchases of electricity for the wells and booster <br />pumps at this site. The address of this station is 2401 N. Bristol Street. The SCE Service Account number is 3- <br />001-3273-57 and the Rate Schedule is TOU-PA-3-B-S. <br />The configuration of this turbine installation is shown in Figure 1. After the discharge of the turbine there is a <br />manual control valve (fully open during the site visit) and a pressure regulating valve to drop the pressure as <br />needed to match the City pressure. The MWD pressure observed at SA -1 during July 2018 was 164 psig, while <br />the City system pressure was observed to be 73 psig. <br />Figure 1. <br />SA -1 Existing Configuration (July 2018) <br />Generator Ball Valve <br />68 kW with Motorized <br />Flow Controller <br />164 f=j127 73 <br />DSIG PSIG r1 PSI( <br />Turbine PRV <br />Pump Room [d <br />Motorized <br />MWD I.:I pRV �.:� To Santa Ana <br />Distribution <br />The pressure after the turbine and before the PRV was observed to be 127 psig per the local meter. This means <br />a pressure drop of 37 psi, or 85 feet through the turbine. The flow at this time was 8.2 CFS and the turbine was <br />metered at 68 kW of electrical power. <br />Note that the theoretical power can be calculated from flow and pressure drop as follows. This calculation <br />assumes a turbine mechanical efficiency of 70%. This low pressure drop puts the turbine outside its normal <br />operating range, so the efficiency is only an assumption. <br />8.2 ft3hp sec 62.4 lbs 0.746 kW <br />sec x 85 ft x 550 ft lbs x fta x 70% mech. 95% elect.eff x hp = 39 kW <br />The theoretical power production under these conditions is estimated at 39 kW, while the electric meter reads <br />68 kW. We will assume that the electric meter is reading correctly here, as that gives more conservative results <br />Newcomb I Anderson I McCormick 19H-21 CITY OF SANTA ANA <br />