West Point Wastewater Treatment Plant LSG Pipe Replacement

Location Seattle, Washington

Client King County Wastewater Treatment Division

  • Instrumentation & Controls
  • Electrical Engineering 

The plant treats wastewater from the city of Seattle and other nearby communities. 

In support of King County’s replacement of the piping that conveys low pressure sludge gas (LSG) from the digesters, our electrical engineers produced the construction drawings and specifications to support the updating of several instruments, including pressure gauges, pressure transmitters, and thermal mass flow meters that measure the digester gas production, and pressure switches that initiate alarms.   

A new radar-based level sensor design, developed by our team specifically for this project, was added to measure the depth of the foam blanket that forms above the liquid in one of the digesters. The design addressed the associated modifications to the plant’s central control system, the new control wiring needed for the new instruments, and a new raceway system suitable for the classified areas. Our team also supported the start-up and commissioning associated with the new instruments. 

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