Metropolitan Water District of Southern California (MWD), Weymouth ORP Design

ProjectLine provided mechanical and instrumentation engineering design and CAD services for upgrade of MWD’s 520 mgd Weymouth Water Treatment Plant from chlorine disinfection to ozone. Instrumentation design included over 80 P&IDs for ozone generation and related cooling water and chemical injection systems. P&IDs were developed using Bentley’s Plantspace software with an innovative, customized database application. Linking a database with equipment and instruments on P&IDs allowed for accurate and efficient development of instrument lists, I/O and equipment lists. ProjectLine prepared control loop descriptions and diagrams of network communication systems detailing integration with MWD’s existing SCADA.

ProjectLine designed rapid mixing systems for chemical additions, including six 3,500 gpm, 75 HP, VFD-driven centrifugal pumps with related mixing nozzles and chemical diffusers for alum, polymer and chlorine. Rapid mix designs included three large ultrasonic flow meters (in 15 ft x 13 ft box conduit) and isolation gates for connection to the existing treatment plant. ProjectLine was a subconsultant to Carollo Engineers for the project.